Added more stack trace from the log,
ERROR [org.apache.wicket.serialize.java.JavaSerializer] (default task-54) error writing object [Page class = com.tre.wktcommon.components.FieldSearchTField$5$1, id = 122, render count = 1]: null: java.util.ConcurrentModificationException at java.util.ArrayList.writeObject(ArrayList.java:766) at sun.reflect.GeneratedMethodAccessor26.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1028) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) at java.io.ObjectOutputStream.writeOrdinaryObject( ObjectOutputStream.java:1432) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) at java.io.ObjectOutputStream.defaultWriteFields( ObjectOutputStream.java:1548) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509) at java.io.ObjectOutputStream.writeOrdinaryObject( ObjectOutputStream.java:1432) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348) at org.apache.wicket.serialize.java.JavaSerializer$ SerializationCheckerObjectOutputStream.writeObjectOverride( JavaSerializer.java:256) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:344) at org.apache.wicket.serialize.java.JavaSerializer.serialize( JavaSerializer.java:78) at org.apache.wicket.pageStore.AbstractPageStore.serializePage( AbstractPageStore.java:133) at org.apache.wicket.pageStore.DefaultPageStore.createSerializedPage( DefaultPageStore.java:281) at org.apache.wicket.pageStore.DefaultPageStore.prepareForSerialization( DefaultPageStore.java:137) at org.apache.wicket.page.PageStoreManager$SessionEntry. writeObject(PageStoreManager.java:251) at sun.reflect.GeneratedMethodAccessor342.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) Caused by: java.util.ConcurrentModificationException at org.apache.commons.collections4.map.AbstractLinkedMap$LinkIterator.nextEntry(AbstractLinkedMap.java:552) at org.apache.commons.collections4.map.AbstractLinkedMap$LinkMapIterator.next(AbstractLinkedMap.java:357) at org.apache.commons.collections4.map.AbstractHashedMap.doWriteObject(AbstractHashedMap.java:1233) at org.apache.commons.collections4.map.LinkedMap.writeObject(LinkedMap.java:124) at sun.reflect.GeneratedMethodAccessor341.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.jboss.marshalling.reflect.SerializableClass.callWriteObject(SerializableClass.java:271) at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:976) at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854) at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032) at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988) at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967) at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967) at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967) at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967) at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967) at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967) at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854) at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032) at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988) at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854) at org.jboss.marshalling.river.BlockMarshaller.doWriteObject(BlockMarshaller.java:65) at org.jboss.marshalling.river.BlockMarshaller.writeObject(BlockMarshaller.java:56) at org.jboss.marshalling.MarshallerObjectOutputStream.writeObjectOverride(MarshallerObjectOutputStream.java:50) at org.jboss.marshalling.river.RiverObjectOutputStream.writeObjectOverride(RiverObjectOutputStream.java:179) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:344) at java.util.concurrent.CopyOnWriteArrayList.writeObject(CopyOnWriteArrayList.java:972) at sun.reflect.GeneratedMethodAccessor30.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.jboss.marshalling.reflect.SerializableClass.callWriteObject(SerializableClass.java:271) at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:976) at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854) at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032) at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988) at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854) at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032) at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988) at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967) at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967) at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854) at org.jboss.marshalling.river.BlockMarshaller.doWriteObject(BlockMarshaller.java:65) at org.jboss.marshalling.river.BlockMarshaller.writeObject(BlockMarshaller.java:56) at org.jboss.marshalling.MarshallerObjectOutputStream.writeObjectOverride(MarshallerObjectOutputStream.java:50) at org.jboss.marshalling.river.RiverObjectOutputStream.writeObjectOverride(RiverObjectOutputStream.java:179) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:344) at java.util.concurrent.ConcurrentHashMap.writeObject(ConcurrentHashMap.java:1413) at sun.reflect.GeneratedMethodAccessor27.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.jboss.marshalling.reflect.SerializableClass.callWriteObject(SerializableClass.java:271) at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:976) at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854) at org.jboss.marshalling.AbstractObjectOutput.writeObject(AbstractObjectOutput.java:58) at org.jboss.marshalling.AbstractMarshaller.writeObject(AbstractMarshaller.java:111) at org.wildfly.clustering.marshalling.jboss.SimpleMarshalledValue.getBytes(SimpleMarshalledValue.java:76) at org.wildfly.clustering.marshalling.jboss.SimpleMarshalledValueExternalizer.writeObject(SimpleMarshalledValueExternalizer.java:49) at org.wildfly.clustering.marshalling.jboss.SimpleMarshalledValueExternalizer.writeObject(SimpleMarshalledValueExternalizer.java:34) at org.wildfly.clustering.infinispan.spi.marshalling.AdvancedExternalizerAdapter.writeObject(AdvancedExternalizerAdapter.java:49) at org.infinispan.marshall.core.ExternalizerTable$ForeignExternalizerAdapter.writeObject(ExternalizerTable.java:534) at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:138) at org.jboss.marshalling.AbstractObjectOutput.writeObject(AbstractObjectOutput.java:58) at org.jboss.marshalling.AbstractMarshaller.writeObject(AbstractMarshaller.java:111) at org.infinispan.marshall.exts.ReplicableCommandExternalizer.writeCommandParameters(ReplicableCommandExternalizer.java:66) at org.infinispan.marshall.exts.ReplicableCommandExternalizer.writeObject(ReplicableCommandExternalizer.java:51) at org.infinispan.marshall.exts.ReplicableCommandExternalizer.writeObject(ReplicableCommandExternalizer.java:39) at org.infinispan.marshall.core.ExternalizerTable$ExternalizerAdapter.writeObject(ExternalizerTable.java:485) at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:138) at org.jboss.marshalling.AbstractObjectOutput.writeObject(AbstractObjectOutput.java:58) at org.jboss.marshalling.AbstractMarshaller.writeObject(AbstractMarshaller.java:111) at org.infinispan.marshall.exts.ReplicableCommandExternalizer.writeCommandParameters(ReplicableCommandExternalizer.java:66) at org.infinispan.marshall.exts.CacheRpcCommandExternalizer.marshallParameters(CacheRpcCommandExternalizer.java:128) at org.infinispan.marshall.exts.CacheRpcCommandExternalizer.writeObject(CacheRpcCommandExternalizer.java:112) at org.infinispan.marshall.exts.CacheRpcCommandExternalizer.writeObject(CacheRpcCommandExternalizer.java:68) at org.infinispan.marshall.core.ExternalizerTable$ExternalizerAdapter.writeObject(ExternalizerTable.java:485) at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:138) at org.jboss.marshalling.AbstractObjectOutput.writeObject(AbstractObjectOutput.java:58) at org.jboss.marshalling.AbstractMarshaller.writeObject(AbstractMarshaller.java:111) at org.infinispan.commons.marshall.jboss.AbstractJBossMarshaller.objectToObjectStream(AbstractJBossMarshaller.java:72) at org.infinispan.marshall.core.VersionAwareMarshaller.objectToBuffer(VersionAwareMarshaller.java:77) at org.infinispan.commons.marshall.AbstractMarshaller.objectToBuffer(AbstractMarshaller.java:41) at org.infinispan.commons.marshall.AbstractDelegatingMarshaller.objectToBuffer(AbstractDelegatingMarshaller.java:85) at org.infinispan.remoting.transport.jgroups.MarshallerAdapter.objectToBuffer(MarshallerAdapter.java:23) at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.marshallCall(CommandAwareRpcDispatcher.java:256) at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.processSingleCall(CommandAwareRpcDispatcher.java:274) at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.invokeRemoteCommand(CommandAwareRpcDispatcher.java:130) ... 89 more Caused by: an exception which occurred: in field children in field reporter in field messages in field feedbackMessages in object java.util.concurrent.ConcurrentHashMap@95574862 in object org.wildfly.clustering.marshalling.jboss.SimpleMarshalledValue@95574862 in object org.infinispan.commands.write.PutKeyValueCommand@b04c35d9 in object org.infinispan.commands.remote.SingleRpcCommand@5963da51 On Thu, Dec 28, 2017 at 1:31 PM, durairaj t <durairaj....@gmail.com> wrote: > My application is running in Wicket7.6 frequently logging the below error > and increasing the log file size, > > Any help? > > > > ERROR [org.apache.wicket.serialize.java.JavaSerializer] (default > task-54) error writing object [Page class = > com.tre.wktcommon.components.FieldSearchTField$5$1, > id = 122, render count = 1]: null: java.util. > ConcurrentModificationException > at java.util.ArrayList.writeObject(ArrayList.java:766) > at sun.reflect.GeneratedMethodAccessor26.invoke(Unknown Source) > at sun.reflect.DelegatingMethodAccessorImpl.invoke( > DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:498) > at java.io.ObjectStreamClass.invokeWriteObject( > ObjectStreamClass.java:1028) > at java.io.ObjectOutputStream.writeSerialData( > ObjectOutputStream.java:1496) > at java.io.ObjectOutputStream.writeOrdinaryObject( > ObjectOutputStream.java:1432) > at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) > at java.io.ObjectOutputStream.defaultWriteFields( > ObjectOutputStream.java:1548) > at java.io.ObjectOutputStream.writeSerialData( > ObjectOutputStream.java:1509) > at java.io.ObjectOutputStream.writeOrdinaryObject( > ObjectOutputStream.java:1432) > at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) > at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348) > at org.apache.wicket.serialize.java.JavaSerializer$ > SerializationCheckerObjectOutputStream.writeObjectOverride( > JavaSerializer.java:256) > at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:344) > at org.apache.wicket.serialize.java.JavaSerializer.serialize( > JavaSerializer.java:78) > at org.apache.wicket.pageStore.AbstractPageStore.serializePage( > AbstractPageStore.java:133) > at org.apache.wicket.pageStore.DefaultPageStore.createSerializedPage( > DefaultPageStore.java:281) > at org.apache.wicket.pageStore.DefaultPageStore.prepareForSerialization( > DefaultPageStore.java:137) > at org.apache.wicket.page.PageStoreManager$SessionEntry. > writeObject(PageStoreManager.java:251) > at sun.reflect.GeneratedMethodAccessor342.invoke(Unknown Source) > at sun.reflect.DelegatingMethodAccessorImpl.invoke( > DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:498) >
