Error when set RocksDBStateBackend option in Flink?

[gerryzhou]

I use the follow code to set RocksDBStateBackend and it option, it can run correctly locally, but can't be submitted to cluster.

Main.class:

public static void main() {

       final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        RocksDBStateBackend rocksDBBackEnd = new RocksDBStateBackend("file:///Users/zsh/tmp/rocksdb");

        rocksDBBackEnd.setPredefinedOptions(PredefinedOptions.DEFAULT);

        rocksDBBackEnd.setOptions(new MRocksDBFactory());

        env.setStateBackend(rocksDBBackEnd);

        ...............        

        env.execute(jobName);

}

MRocksDBFactory.class:

public class MRocksDBFactory implements OptionsFactory {

@Override

public DBOptions createDBOptions(DBOptions currentOptions) {

return currentOptions;

}

@Override

public ColumnFamilyOptions createColumnOptions(ColumnFamilyOptions currentOptions) {

return currentOptions;

}

}

The exception info in jobmanager.log look like below:

2017-06-29 16:29:27,162 WARN  akka.remote.ReliableDeliverySupervisor                        - Association with remote system [akka.tcp://[hidden email]:52638] has failed, address is now gated for [5000] ms. Reason: [gerryzhou.MRocksDBFactory]

2017-06-29 16:29:27,163 ERROR Remoting                                                      - gerryzhou.MRocksDBFactory

java.lang.ClassNotFoundException: gerryzhou.MRocksDBFactory

at java.net.URLClassLoader.findClass(URLClassLoader.java:381)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)

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:677)

at akka.util.ClassLoaderObjectInputStream.resolveClass(ClassLoaderObjectInputStream.scala:19)

at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1819)

at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1713)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1986)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.readObject(ObjectInputStream.java:422)

at akka.serialization.JavaSerializer$$anonfun$1.apply(Serializer.scala:136)

at scala.util.DynamicVariable.withValue(DynamicVariable.scala:58)

at akka.serialization.JavaSerializer.fromBinary(Serializer.scala:136)

at akka.serialization.Serialization$$anonfun$deserialize$1.apply(Serialization.scala:104)

at scala.util.Try$.apply(Try.scala:192)

at akka.serialization.Serialization.deserialize(Serialization.scala:98)

at akka.remote.MessageSerializer$.deserialize(MessageSerializer.scala:23)

at akka.remote.DefaultMessageDispatcher.payload$lzycompute$1(Endpoint.scala:58)

at akka.remote.DefaultMessageDispatcher.payload$1(Endpoint.scala:58)

at akka.remote.DefaultMessageDispatcher.dispatch(Endpoint.scala:76)

at akka.remote.EndpointReader$$anonfun$receive$2.applyOrElse(Endpoint.scala:967)

at akka.actor.Actor$class.aroundReceive(Actor.scala:467)

at akka.remote.EndpointActor.aroundReceive(Endpoint.scala:437)

at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)

at akka.actor.ActorCell.invoke(ActorCell.scala:487)

at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)

at akka.dispatch.Mailbox.run(Mailbox.scala:220)

at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397)

at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)

at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)

at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)

at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

Can anybody help?

 

 

[Ted Yu]

Since MRocksDBFactory doesn't add any option, it seems rocksDBBackEnd.setOptions() call can be skipped.

If you choose to keep the call, please take a look at (OptionsFactory extends java.io.Serializable):

https://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html

On Thu, Jun 29, 2017 at 2:16 AM, 周思华 <[hidden email]> wrote:

I use the follow code to set RocksDBStateBackend and it option, it can run correctly locally, but can't be submitted to cluster.

Main.class:

public static void main() {

       final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        RocksDBStateBackend rocksDBBackEnd = new RocksDBStateBackend("file:///Users/zsh/tmp/rocksdb");

        rocksDBBackEnd.setPredefinedOptions(PredefinedOptions.DEFAULT);

        rocksDBBackEnd.setOptions(new MRocksDBFactory());

        env.setStateBackend(rocksDBBackEnd);

        ...............        

        env.execute(jobName);

}

MRocksDBFactory.class:

public class MRocksDBFactory implements OptionsFactory {

@Override

public DBOptions createDBOptions(DBOptions currentOptions) {

return currentOptions;

}

@Override

public ColumnFamilyOptions createColumnOptions(ColumnFamilyOptions currentOptions) {

return currentOptions;

}

}

The exception info in jobmanager.log look like below:

2017-06-29 16:29:27,162 WARN  akka.remote.ReliableDeliverySupervisor                        - Association with remote system [akka.tcp://[hidden email]:52638] has failed, address is now gated for [5000] ms. Reason: [gerryzhou.MRocksDBFactory]

2017-06-29 16:29:27,163 ERROR Remoting                                                      - gerryzhou.MRocksDBFactory

java.lang.ClassNotFoundException: gerryzhou.MRocksDBFactory

at java.net.URLClassLoader.findClass(URLClassLoader.java:381)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)

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:677)

at akka.util.ClassLoaderObjectInputStream.resolveClass(ClassLoaderObjectInputStream.scala:19)

at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1819)

at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1713)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1986)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.readObject(ObjectInputStream.java:422)

at akka.serialization.JavaSerializer$$anonfun$1.apply(Serializer.scala:136)

at scala.util.DynamicVariable.withValue(DynamicVariable.scala:58)

at akka.serialization.JavaSerializer.fromBinary(Serializer.scala:136)

at akka.serialization.Serialization$$anonfun$deserialize$1.apply(Serialization.scala:104)

at scala.util.Try$.apply(Try.scala:192)

at akka.serialization.Serialization.deserialize(Serialization.scala:98)

at akka.remote.MessageSerializer$.deserialize(MessageSerializer.scala:23)

at akka.remote.DefaultMessageDispatcher.payload$lzycompute$1(Endpoint.scala:58)

at akka.remote.DefaultMessageDispatcher.payload$1(Endpoint.scala:58)

at akka.remote.DefaultMessageDispatcher.dispatch(Endpoint.scala:76)

at akka.remote.EndpointReader$$anonfun$receive$2.applyOrElse(Endpoint.scala:967)

at akka.actor.Actor$class.aroundReceive(Actor.scala:467)

at akka.remote.EndpointActor.aroundReceive(Endpoint.scala:437)

at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)

at akka.actor.ActorCell.invoke(ActorCell.scala:487)

at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)

at akka.dispatch.Mailbox.run(Mailbox.scala:220)

at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397)

at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)

at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)

at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)

at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

Can anybody help?

 

 

[gerryzhou]

I will keep the call to special my rocksdb option later, OptionFactory have already extended the java.io.Serializable interface and MRocksDBFactory  implement from OptionFactory , so MRocksDBFactory should have the Serializability. Why this problem occur? 

At 2017-06-29 17:53:07, "Ted Yu" <[hidden email]> wrote:

Since MRocksDBFactory doesn't add any option, it seems rocksDBBackEnd.setOptions() call can be skipped.

If you choose to keep the call, please take a look at (OptionsFactory extends java.io.Serializable):

https://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html

On Thu, Jun 29, 2017 at 2:16 AM, 周思华 <[hidden email]> wrote:

I use the follow code to set RocksDBStateBackend and it option, it can run correctly locally, but can't be submitted to cluster.

Main.class:

public static void main() {

       final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        RocksDBStateBackend rocksDBBackEnd = new RocksDBStateBackend("file:///Users/zsh/tmp/rocksdb");

        rocksDBBackEnd.setPredefinedOptions(PredefinedOptions.DEFAULT);

        rocksDBBackEnd.setOptions(new MRocksDBFactory());

        env.setStateBackend(rocksDBBackEnd);

        ...............        

        env.execute(jobName);

}

MRocksDBFactory.class:

public class MRocksDBFactory implements OptionsFactory {

@Override

public DBOptions createDBOptions(DBOptions currentOptions) {

return currentOptions;

}

@Override

public ColumnFamilyOptions createColumnOptions(ColumnFamilyOptions currentOptions) {

return currentOptions;

}

}

The exception info in jobmanager.log look like below:

2017-06-29 16:29:27,162 WARN  akka.remote.ReliableDeliverySupervisor                        - Association with remote system [akka.tcp://[hidden email]:52638] has failed, address is now gated for [5000] ms. Reason: [gerryzhou.MRocksDBFactory]

2017-06-29 16:29:27,163 ERROR Remoting                                                      - gerryzhou.MRocksDBFactory

java.lang.ClassNotFoundException: gerryzhou.MRocksDBFactory

at java.net.URLClassLoader.findClass(URLClassLoader.java:381)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)

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:677)

at akka.util.ClassLoaderObjectInputStream.resolveClass(ClassLoaderObjectInputStream.scala:19)

at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1819)

at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1713)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1986)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.readObject(ObjectInputStream.java:422)

at akka.serialization.JavaSerializer$$anonfun$1.apply(Serializer.scala:136)

at scala.util.DynamicVariable.withValue(DynamicVariable.scala:58)

at akka.serialization.JavaSerializer.fromBinary(Serializer.scala:136)

at akka.serialization.Serialization$$anonfun$deserialize$1.apply(Serialization.scala:104)

at scala.util.Try$.apply(Try.scala:192)

at akka.serialization.Serialization.deserialize(Serialization.scala:98)

at akka.remote.MessageSerializer$.deserialize(MessageSerializer.scala:23)

at akka.remote.DefaultMessageDispatcher.payload$lzycompute$1(Endpoint.scala:58)

at akka.remote.DefaultMessageDispatcher.payload$1(Endpoint.scala:58)

at akka.remote.DefaultMessageDispatcher.dispatch(Endpoint.scala:76)

at akka.remote.EndpointReader$$anonfun$receive$2.applyOrElse(Endpoint.scala:967)

at akka.actor.Actor$class.aroundReceive(Actor.scala:467)

at akka.remote.EndpointActor.aroundReceive(Endpoint.scala:437)

at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)

at akka.actor.ActorCell.invoke(ActorCell.scala:487)

at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)

at akka.dispatch.Mailbox.run(Mailbox.scala:220)

at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397)

at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)

at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)

at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)

at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

Can anybody help?

 

 

 

[Tzu-Li (Gordon) Tai]

Hi!

Thanks a lot for reporting this.

It turns out that this is a nasty bug: https://issues.apache.org/jira/browse/FLINK-7041.

Aljoscha is working on fixing it already. It’s definitely a critical bug, so we’ll try to include in the next bugfix release.

Cheers,

Gordon

On 29 June 2017 at 7:05:09 PM, 周思华 ([hidden email]) wrote:

I will keep the call to special my rocksdb option later, OptionFactory have already extended the java.io.Serializable interface and MRocksDBFactory  implement from OptionFactory , so MRocksDBFactory should have the Serializability. Why this problem occur? 

At 2017-06-29 17:53:07, "Ted Yu" <[hidden email]> wrote:

Since MRocksDBFactory doesn't add any option, it seems rocksDBBackEnd.setOptions() call can be skipped.

If you choose to keep the call, please take a look at (OptionsFactory extends java.io.Serializable):

https://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html

On Thu, Jun 29, 2017 at 2:16 AM, 周思华 <[hidden email]> wrote:

I use the follow code to set RocksDBStateBackend and it option, it can run correctly locally, but can't be submitted to cluster.

Main.class:

public static void main() {

       final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        RocksDBStateBackend rocksDBBackEnd = new RocksDBStateBackend("file:///Users/zsh/tmp/rocksdb");

        rocksDBBackEnd.setPredefinedOptions(PredefinedOptions.DEFAULT);

        rocksDBBackEnd.setOptions(new MRocksDBFactory());

        env.setStateBackend(rocksDBBackEnd);

        ...............        

        env.execute(jobName);

}

MRocksDBFactory.class:

public class MRocksDBFactory implements OptionsFactory {

@Override

public DBOptions createDBOptions(DBOptions currentOptions) {

return currentOptions;

}

@Override

public ColumnFamilyOptions createColumnOptions(ColumnFamilyOptions currentOptions) {

return currentOptions;

}

}

The exception info in jobmanager.log look like below:

2017-06-29 16:29:27,162 WARN  akka.remote.ReliableDeliverySupervisor                        - Association with remote system [akka.tcp://[hidden email]:52638] has failed, address is now gated for [5000] ms. Reason: [gerryzhou.MRocksDBFactory]

2017-06-29 16:29:27,163 ERROR Remoting                                                      - gerryzhou.MRocksDBFactory

java.lang.ClassNotFoundException: gerryzhou.MRocksDBFactory

at java.net.URLClassLoader.findClass(URLClassLoader.java:381)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)

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:677)

at akka.util.ClassLoaderObjectInputStream.resolveClass(ClassLoaderObjectInputStream.scala:19)

at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1819)

at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1713)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1986)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)

at java.io.ObjectInputStream.readObject(ObjectInputStream.java:422)

at akka.serialization.JavaSerializer$$anonfun$1.apply(Serializer.scala:136)

at scala.util.DynamicVariable.withValue(DynamicVariable.scala:58)

at akka.serialization.JavaSerializer.fromBinary(Serializer.scala:136)

at akka.serialization.Serialization$$anonfun$deserialize$1.apply(Serialization.scala:104)

at scala.util.Try$.apply(Try.scala:192)

at akka.serialization.Serialization.deserialize(Serialization.scala:98)

at akka.remote.MessageSerializer$.deserialize(MessageSerializer.scala:23)

at akka.remote.DefaultMessageDispatcher.payload$lzycompute$1(Endpoint.scala:58)

at akka.remote.DefaultMessageDispatcher.payload$1(Endpoint.scala:58)

at akka.remote.DefaultMessageDispatcher.dispatch(Endpoint.scala:76)

at akka.remote.EndpointReader$$anonfun$receive$2.applyOrElse(Endpoint.scala:967)

at akka.actor.Actor$class.aroundReceive(Actor.scala:467)

at akka.remote.EndpointActor.aroundReceive(Endpoint.scala:437)

at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)

at akka.actor.ActorCell.invoke(ActorCell.scala:487)

at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)

at akka.dispatch.Mailbox.run(Mailbox.scala:220)

at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397)

at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)

at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)

at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)

at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

Can anybody help?