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java.util.ConcurrentModificationException: 	at java.util.AbstractList$SimpleListIterator.next(AbstractList.java:64)	at java.util.ArrayList.writeObject(ArrayList.java:706)	at sun.reflect.GeneratedMethodAccessor67.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)	at java.lang.reflect.Method.invoke(Method.java:599)	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:956)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1472)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1403)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1161)	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1520)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1485)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1403)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1161)	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:337)	at net.sf.ehcache.distribution.EventMessage.writeObject(EventMessage.java:134)	at sun.reflect.GeneratedMethodAccessor84.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)	at java.lang.reflect.Method.invoke(Method.java:599)	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:956)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1472)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1403)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1161)	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:337)	at java.util.ArrayList.writeObject(ArrayList.java:706)	at sun.reflect.GeneratedMethodAccessor67.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)	at java.lang.reflect.Method.invoke(Method.java:599)	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:956)	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1472)	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1403)	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1161)	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:337)	at sun.rmi.server.UnicastRef.marshalValue(UnicastRef.java:286)	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:145)	at net.sf.ehcache.distribution.RMICachePeer_Stub.send(Unknown Source)	at net.sf.ehcache.distribution.RMIAsynchronousCacheReplicator.flushReplicationQueue(RMIAsynchronousCacheReplicator.java:319)	at net.sf.ehcache.distribution.RMIAsynchronousCacheReplicator.replicationThreadMain(RMIAsynchronousCacheReplicator.java:117)	at net.sf.ehcache.distribution.RMIAsynchronousCacheReplicator.access$100(RMIAsynchronousCacheReplicator.java:55)	at net.sf.ehcache.distribution.RMIAsynchronousCacheReplicator$ReplicationThread.run(RMIAsynchronousCacheReplicator.java:378)