Getting Exceptions/WARN during random runs for same dataset
Hi Everyone, Environment used: Datastax Enterprise 4.8.3 which is bundled with Spark 1.4.1 and scala 2.10.5. I am using Dataframes to query Cassandra, do processing and store the result back into Cassandra. The job is being submitted using spark-submit on a cluster of 3 nodes. While doing so I get three WARN messages: WARN 2016-01-28 19:08:18 org.apache.spark.scheduler.TaskSetManager: Lost task 99.0 in stage 2.0 (TID 107, 10.2.1.82): java.io.InvalidClassException: org.apache.spark.sql.types.TimestampType$; unable to create instance Caused by: java.lang.reflect.InvocationTargetException Caused by: java.lang.UnsupportedOperationException: tail of empty list For example, if I am running the same job, for the same input set of data, say 20 times, - 11 times it will run successfully without any WARN messages - 4 times it will run successfully with the above messages - 6 times it will run successfully by randomly giving one or two of the exceptions above In all the 20 runs, the output data is coming as expected and there is no error in that. My concern is, why is it not giving these messages every time I do a spark-submit but only at times. Also, the stack trace does not point to any specific point in my line of code. Full stack trace is as follows. Please let me know if you need any other information WARN 2016-01-28 19:08:24 org.apache.spark.scheduler.TaskSetManager: Lost task 188.0 in stage 16.0 (TID 637, 10.2.1.82): java.io.InvalidClassException: org.apache.spark.sql.types.TimestampType$; unable to create instance at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1788) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1707) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1345) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371) at scala.collection.immutable.$colon$colon.readObject(List.scala:362) at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371) at scala.collection.immutable.$colon$colon.readObject(List.scala:362) at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.defaultReadFields(Objec
Getting Exceptions/WARN during random runs for same dataset
Hi Everyone, Environment used: Datastax Enterprise 4.8.3 which is bundled with Spark 1.4.1 and scala 2.10.5. I am using Dataframes to query Cassandra, do processing and store the result back into Cassandra. The job is being submitted using spark-submit on a cluster of 3 nodes. While doing so I get three WARN messages: WARN 2016-01-28 19:08:18 org.apache.spark.scheduler.TaskSetManager: Lost task 99.0 in stage 2.0 (TID 107, 10.2.1.82): java.io.InvalidClassException: org.apache.spark.sql.types.TimestampType$; unable to create instance Caused by: java.lang.reflect.InvocationTargetException Caused by: java.lang.UnsupportedOperationException: tail of empty list For example, if I am running the same job, for the same input set of data, say 20 times, - 11 times it will run successfully without any WARN messages - 4 times it will run successfully with the above messages - 6 times it will run successfully by randomly giving one or two of the exceptions above In all the 20 runs, the output data is coming as expected and there is no error in that. My concern is, why is it not giving these messages every time I do a spark-submit but only at times. Also, the stack trace does not point to any specific point in my line of code. Full stack trace is as follows. Please let me know if you need any other information WARN 2016-01-28 19:08:24 org.apache.spark.scheduler.TaskSetManager: Lost task 188.0 in stage 16.0 (TID 637, 10.2.1.82): java.io.InvalidClassException: org.apache.spark.sql.types.TimestampType$; unable to create instance at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1788) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1707) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1345) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371) at scala.collection.immutable.$colon$colon.readObject(List.scala:362) at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371) at scala.collection.immutable.$colon$colon.readObject(List.scala:362) at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.defaultReadFields(Objec
Re: Getting Exceptions/WARN during random runs for same dataset
It is happening on random executors on random nodes. Not on any specific node everytime. Or not happening at all On Thu, Jan 28, 2016 at 7:42 PM, Ted Yu wrote: > Did the UnsupportedOperationException's happen from the executors on all the > nodes or only one node ? > > Thanks > > On Thu, Jan 28, 2016 at 5:13 PM, Khusro Siddiqui > wrote: > >> Hi Everyone, >> >> Environment used: Datastax Enterprise 4.8.3 which is bundled with Spark >> 1.4.1 and scala 2.10.5. >> >> I am using Dataframes to query Cassandra, do processing and store the >> result back into Cassandra. The job is being submitted using spark-submit >> on a cluster of 3 nodes. While doing so I get three WARN messages: >> >> WARN 2016-01-28 19:08:18 org.apache.spark.scheduler.TaskSetManager: Lost >> task 99.0 in stage 2.0 (TID 107, 10.2.1.82): java.io.InvalidClassException: >> org.apache.spark.sql.types.TimestampType$; unable to create instance >> >> Caused by: java.lang.reflect.InvocationTargetException >> >> Caused by: java.lang.UnsupportedOperationException: tail of empty list >> >> >> For example, if I am running the same job, for the same input set of >> data, say 20 times, >> >> - 11 times it will run successfully without any WARN messages >> >> - 4 times it will run successfully with the above messages >> >> - 6 times it will run successfully by randomly giving one or two of >> the exceptions above >> >> >> In all the 20 runs, the output data is coming as expected and there is no >> error in that. My concern is, why is it not giving these messages every >> time I do a spark-submit but only at times. Also, the stack trace does not >> point to any specific point in my line of code. Full stack trace is as >> follows. Please let me know if you need any other information >> >> >> WARN 2016-01-28 19:08:24 org.apache.spark.scheduler.TaskSetManager: Lost >> task 188.0 in stage 16.0 (TID 637, 10.2.1.82): >> java.io.InvalidClassException: org.apache.spark.sql.types.TimestampType$; >> unable to create instance >> >> at >> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1788) >> >> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) >> >> at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1707) >> >> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1345) >> >> at >> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) >> >> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) >> >> at >> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) >> >> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) >> >> at >> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) >> >> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) >> >> at >> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) >> >> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) >> >> at >> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) >> >> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) >> >> at >> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) >> >> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) >> >> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371) >> >> at scala.collection.immutable.$colon$colon.readObject(List.scala:362) >> >> at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source) >> >> at >> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) >> >> at java.lang.reflect.Method.invoke(Method.java:497) >> >> at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017) >> >> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896) >> >> at >> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) >> >> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) >> >> at >> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) >> >> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) >> >> at >> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) >> >> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) >> >> at >> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) >> >> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) >> >> at >> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) >> >> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) >> >> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371) >> >> at scala.collection.immutable.$colon$colon.readObject(List.scala:362) >> >> at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source) >> >> at >> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) >> >> at java.lang.reflect.
Re: Getting Exceptions/WARN during random runs for same dataset
Did the UnsupportedOperationException's happen from the executors on all the nodes or only one node ? Thanks On Thu, Jan 28, 2016 at 5:13 PM, Khusro Siddiqui wrote: > Hi Everyone, > > Environment used: Datastax Enterprise 4.8.3 which is bundled with Spark > 1.4.1 and scala 2.10.5. > > I am using Dataframes to query Cassandra, do processing and store the > result back into Cassandra. The job is being submitted using spark-submit > on a cluster of 3 nodes. While doing so I get three WARN messages: > > WARN 2016-01-28 19:08:18 org.apache.spark.scheduler.TaskSetManager: Lost > task 99.0 in stage 2.0 (TID 107, 10.2.1.82): java.io.InvalidClassException: > org.apache.spark.sql.types.TimestampType$; unable to create instance > > Caused by: java.lang.reflect.InvocationTargetException > > Caused by: java.lang.UnsupportedOperationException: tail of empty list > > > For example, if I am running the same job, for the same input set of data, > say 20 times, > > - 11 times it will run successfully without any WARN messages > > - 4 times it will run successfully with the above messages > > - 6 times it will run successfully by randomly giving one or two of > the exceptions above > > > In all the 20 runs, the output data is coming as expected and there is no > error in that. My concern is, why is it not giving these messages every > time I do a spark-submit but only at times. Also, the stack trace does not > point to any specific point in my line of code. Full stack trace is as > follows. Please let me know if you need any other information > > > WARN 2016-01-28 19:08:24 org.apache.spark.scheduler.TaskSetManager: Lost > task 188.0 in stage 16.0 (TID 637, 10.2.1.82): > java.io.InvalidClassException: org.apache.spark.sql.types.TimestampType$; > unable to create instance > > at > java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1788) > > at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) > > at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1707) > > at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1345) > > at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) > > at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) > > at > java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) > > at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) > > at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) > > at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) > > at > java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) > > at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) > > at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) > > at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) > > at > java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) > > at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) > > at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371) > > at scala.collection.immutable.$colon$colon.readObject(List.scala:362) > > at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source) > > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > > at java.lang.reflect.Method.invoke(Method.java:497) > > at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017) > > at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896) > > at > java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) > > at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) > > at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) > > at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) > > at > java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) > > at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) > > at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) > > at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) > > at > java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) > > at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) > > at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371) > > at scala.collection.immutable.$colon$colon.readObject(List.scala:362) > > at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source) > > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > > at java.lang.reflect.Method.invoke(Method.java:497) > > at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017) > > at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896) > > at > java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) > > at java.io.ObjectInputStream.readObject0(O
Re: Getting Exceptions/WARN during random runs for same dataset
It's a known issue. See https://issues.apache.org/jira/browse/SPARK-10719 On Thu, Jan 28, 2016 at 5:44 PM, Khusro Siddiqui wrote: > It is happening on random executors on random nodes. Not on any specific > node everytime. > Or not happening at all > > On Thu, Jan 28, 2016 at 7:42 PM, Ted Yu wrote: > >> Did the UnsupportedOperationException's happen from the executors on all the >> nodes or only one node ? >> >> Thanks >> >> On Thu, Jan 28, 2016 at 5:13 PM, Khusro Siddiqui >> wrote: >> >>> Hi Everyone, >>> >>> Environment used: Datastax Enterprise 4.8.3 which is bundled with Spark >>> 1.4.1 and scala 2.10.5. >>> >>> I am using Dataframes to query Cassandra, do processing and store the >>> result back into Cassandra. The job is being submitted using spark-submit >>> on a cluster of 3 nodes. While doing so I get three WARN messages: >>> >>> WARN 2016-01-28 19:08:18 org.apache.spark.scheduler.TaskSetManager: >>> Lost task 99.0 in stage 2.0 (TID 107, 10.2.1.82): >>> java.io.InvalidClassException: org.apache.spark.sql.types.TimestampType$; >>> unable to create instance >>> >>> Caused by: java.lang.reflect.InvocationTargetException >>> >>> Caused by: java.lang.UnsupportedOperationException: tail of empty list >>> >>> >>> For example, if I am running the same job, for the same input set of >>> data, say 20 times, >>> >>> - 11 times it will run successfully without any WARN messages >>> >>> - 4 times it will run successfully with the above messages >>> >>> - 6 times it will run successfully by randomly giving one or two of >>> the exceptions above >>> >>> >>> In all the 20 runs, the output data is coming as expected and there is >>> no error in that. My concern is, why is it not giving these messages every >>> time I do a spark-submit but only at times. Also, the stack trace does not >>> point to any specific point in my line of code. Full stack trace is as >>> follows. Please let me know if you need any other information >>> >>> >>> WARN 2016-01-28 19:08:24 org.apache.spark.scheduler.TaskSetManager: >>> Lost task 188.0 in stage 16.0 (TID 637, 10.2.1.82): >>> java.io.InvalidClassException: org.apache.spark.sql.types.TimestampType$; >>> unable to create instance >>> >>> at >>> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1788) >>> >>> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) >>> >>> at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1707) >>> >>> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1345) >>> >>> at >>> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) >>> >>> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) >>> >>> at >>> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) >>> >>> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) >>> >>> at >>> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) >>> >>> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) >>> >>> at >>> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) >>> >>> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) >>> >>> at >>> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) >>> >>> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) >>> >>> at >>> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) >>> >>> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) >>> >>> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371) >>> >>> at scala.collection.immutable.$colon$colon.readObject(List.scala:362) >>> >>> at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source) >>> >>> at >>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) >>> >>> at java.lang.reflect.Method.invoke(Method.java:497) >>> >>> at >>> java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017) >>> >>> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896) >>> >>> at >>> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) >>> >>> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) >>> >>> at >>> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) >>> >>> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) >>> >>> at >>> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) >>> >>> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) >>> >>> at >>> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) >>> >>> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) >>> >>> at >>> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801) >>> >>> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) >>> >>> at java.io.ObjectInputStream.readObject(ObjectInputStream.