Hi Big data, I don't use SerializationUtils, but if I interpret the error message:
ClassNotFoundException: com.XXXX.XXXX , this says com.XXXX.XXXX is not available in the class path of JVM (which your Spark is running on). I would verify that you can instantiate com.XXXX.XXXX in Spark/Scala *without* SerializationUtils. Regards, Tomo On Wed, Jun 26, 2019 at 4:12 AM big data <[email protected]> wrote: > I use Apache Commons Lang3's SerializationUtils in the code. > > SerializationUtils.serialize() > > to store a customized class as files into disk and > > SerializationUtils.deserialize(byte[]) > > to restore them again. > > In the local environment (Mac OS), all serialized files can be > deserialized normally and no error happens. But when I copy these > serialized files into HDFS, and read them from HDFS by using Spark/Scala, a > SerializeException happens. > > The Apache Commons Lang3 version is: > > <dependency> > <groupId>org.apache.commons</groupId> > <artifactId>commons-lang3</artifactId> > <version>3.9</version> > </dependency> > > > the stack error as below: > > org.apache.commons.lang3.SerializationException: > java.lang.ClassNotFoundException: com.XXXX.XXXX > at > org.apache.commons.lang3.SerializationUtils.deserialize(SerializationUtils.java:227) > at > org.apache.commons.lang3.SerializationUtils.deserialize(SerializationUtils.java:265) > at com.com.XXXX.XXXX.deserializeFrom(XXX.java:81) > at com.XXX.FFFF$$anonfun$3.apply(BXXXX.scala:157) > at com.XXX.FFFF$$anonfun$3.apply(BXXXX.scala:153) > at scala.collection.Iterator$$anon$11.next(Iterator.scala:409) > at scala.collection.Iterator$class.foreach(Iterator.scala:893) > at scala.collection.AbstractIterator.foreach(Iterator.scala:1336) > at > scala.collection.generic.Growable$class.$plus$plus$eq(Growable.scala:59) > at > scala.collection.mutable.ArrayBuffer.$plus$plus$eq(ArrayBuffer.scala:104) > at > scala.collection.mutable.ArrayBuffer.$plus$plus$eq(ArrayBuffer.scala:48) > at scala.collection.TraversableOnce$class.to > (TraversableOnce.scala:310) > at scala.collection.AbstractIterator.to(Iterator.scala:1336) > at > scala.collection.TraversableOnce$class.toBuffer(TraversableOnce.scala:302) > at scala.collection.AbstractIterator.toBuffer(Iterator.scala:1336) > at > scala.collection.TraversableOnce$class.toArray(TraversableOnce.scala:289) > at scala.collection.AbstractIterator.toArray(Iterator.scala:1336) > at > org.apache.spark.rdd.RDD$$anonfun$collect$1$$anonfun$12.apply(RDD.scala:945) > at > org.apache.spark.rdd.RDD$$anonfun$collect$1$$anonfun$12.apply(RDD.scala:945) > at > org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:2074) > at > org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:2074) > at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87) > at org.apache.spark.scheduler.Task.run(Task.scala:109) > at > org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:345) > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) > at java.lang.Thread.run(Thread.java:748) > Caused by: java.lang.ClassNotFoundException: com.XXXX.XXXX > at java.net.URLClassLoader.findClass(URLClassLoader.java:381) > at java.lang.ClassLoader.loadClass(ClassLoader.java:424) > at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) > at java.lang.ClassLoader.loadClass(ClassLoader.java:357) > at java.lang.Class.forName0(Native Method) > at java.lang.Class.forName(Class.java:348) > at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:686) > at > java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1868) > at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1751) > at > java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2042) > at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1573) > at java.io.ObjectInputStream.readObject(ObjectInputStream.java:431) > at > org.apache.commons.lang3.SerializationUtils.deserialize(SerializationUtils.java:223) > > I've check the loaded byte[]'s length, both from local and from HDFS are > same. But why it can not be deserialized from HDFS? > -- Regards, Tomo
