[jira] [Created] (SPARK-13546) GBT with many trees consistently giving java.lang.StackOverflowError

[Glen Maisey (JIRA)]

Glen Maisey created SPARK-13546:
-----------------------------------

             Summary: GBT with many trees consistently giving 
java.lang.StackOverflowError
                 Key: SPARK-13546
                 URL: https://issues.apache.org/jira/browse/SPARK-13546
             Project: Spark
          Issue Type: Bug
          Components: ML
    Affects Versions: 1.6.0
            Reporter: Glen Maisey


I've found that creating a GBT in SparkML with a large number of trees is 
causing a stackoverflow error. The same code works with a smaller number of 
trees. This was occurring on a large dataset however I've reproduced the error 
using the tiny Fisher's Iris dataset to make it a bit easier to debug 
(https://en.wikipedia.org/wiki/Iris_flower_data_set).

Unfortunately I do not have the skills to fix the issue, just reproduce it. Let 
me know if there are things I could test. Thanks!

{code}
// Import
import org.apache.spark.ml.Pipeline
import org.apache.spark.ml.evaluation.RegressionEvaluator
import org.apache.spark.ml.feature.RFormula
import org.apache.spark.ml.regression.GBTRegressor

// Load Data & specify model
val data = sqlContext.read.format("com.databricks.spark.csv").option("header", 
"true").option("inferSchema", "true").load("/user/glenm/iris.csv")
val formulaString = "SepalLength ~ SepalWidth + PetalLength + PetalWidth + 
Species"

// Setup R Formula
val formula = new RFormula().setFormula(formulaString)
    
// Setup evaluation metric
val evaluator = new 
RegressionEvaluator().setLabelCol("label").setPredictionCol("prediction").setMetricName("rmse")
 

val pipeline = new Pipeline().setStages(Array(formula))        

// Transform the data 
val pipelineModel = pipeline.fit(data)
val transformedData = pipelineModel.transform(data).select("features","label")

// Split our data into test and train
val Array(train, test) = transformedData.randomSplit(Array(0.9, 0.1))

// Cache our training data
val trainingData = train.repartition(2).cache()
trainingData.count()

// Setup GBT
val gbt = new 
GBTRegressor().setMaxIter(1000).setStepSize(0.001).setMaxDepth(3).setMaxMemoryInMB(256).setMinInstancesPerNode(5).setSubsamplingRate(0.8).setMaxBins(10)

// Create the GBT   
val myGBM = gbt.fit(trainingData)

{code}

Stack trace:


java.lang.StackOverflowError
        at 
java.io.ObjectStreamClass.getPrimFieldValues(ObjectStreamClass.java:1233)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1532)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at 
scala.collection.mutable.HashMap$$anonfun$writeObject$1.apply(HashMap.scala:137)
        at 
scala.collection.mutable.HashMap$$anonfun$writeObject$1.apply(HashMap.scala:135)
        at 
scala.collection.mutable.HashTable$class.foreachEntry(HashTable.scala:226)
        at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:39)
        at 
scala.collection.mutable.HashTable$class.serializeTo(HashTable.scala:124)
        at scala.collection.mutable.HashMap.serializeTo(HashMap.scala:39)
        at scala.collection.mutable.HashMap.writeObject(HashMap.scala:135)
        at sun.reflect.GeneratedMethodAccessor46.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
        at scala.collection.immutable.$colon$colon.writeObject(List.scala:379)
        at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at 
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
        at 
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
        at 
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)




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