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From "NM, Vijayakumar" <vijayakumar...@capgemini.com>
Subject [JCS] ConcurrentModificationException
Date Wed, 25 Jan 2012 11:03:25 GMT
Hi All,

We have an application which uses JCS cache to write data into IndexedDiskCache, sometime
are getting ConcurrentModificationException when application tries to update the cache object
frequently, please let me know what could be the reason and is there any workarounds to solve
the issue. We are using JCS 1.3

2012-01-25 10:38:44,088 ERROR [RemoteCache] - <Disabling remote cache due to error: Failed
to put [TEMP1] to tempRegion>
java.util.ConcurrentModificationException
                at java.util.HashMap$HashIterator.nextEntry(HashMap.java:841)
                at java.util.HashMap$EntryIterator.next(HashMap.java:883)
                at java.util.HashMap$EntryIterator.next(HashMap.java:881)
                at java.util.HashMap.writeObject(HashMap.java:1037)
                at sun.reflect.GeneratedMethodAccessor15.invoke(Unknown Source)
                at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
                at java.lang.reflect.Method.invoke(Method.java:592)
                at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:917)
                at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1339)
                at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
                at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
                at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
                at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
                at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
                at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
                at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302)
                at org.apache.jcs.utils.serialization.StandardSerializer.serialize(StandardSerializer.java:50)
                at org.apache.jcs.utils.serialization.SerializationConversionUtil.getSerializedCacheElement(SerializationConversionUtil.java:73)
                at org.apache.jcs.auxiliary.remote.RemoteCache.update(RemoteCache.java:207)
                at org.apache.jcs.engine.CacheAdaptor.handlePut(CacheAdaptor.java:91)
                at org.apache.jcs.engine.PooledCacheEventQueue$PutEvent.doRun(PooledCacheEventQueue.java:474)
                at org.apache.jcs.engine.PooledCacheEventQueue$AbstractCacheEvent.run(PooledCacheEventQueue.java:397)
                at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:748)
                at java.lang.Thread.run(Thread.java:595)

Regards,
Vijay







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