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https://issues.apache.org/jira/browse/JCS-246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18071768#comment-18071768
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Thomas Vandahl commented on JCS-246:
------------------------------------
JCS does neither know what type of data you are trying to cache, nor does it
know what amount of memory you are going to require. Data is being cached by
reference, not copied.
> Thread 682(CacheEventQueue.QProcessor-UserThread-256) exited due to an
> uncaught Exception: java.util.ConcurrentModificationException
> ------------------------------------------------------------------------------------------------------------------------------------
>
> Key: JCS-246
> URL: https://issues.apache.org/jira/browse/JCS-246
> Project: Commons JCS
> Issue Type: Bug
> Components: TCP Lateral Cache
> Affects Versions: jcs-3.2.1
> Reporter: Ionut Vasilescu
> Priority: Major
>
> Thread 682(CacheEventQueue.QProcessor-UserThread-256) exited due to an
> uncaught Exception: java.util.ConcurrentModificationException.
> Stack Trace
> -----------
> java.util.ConcurrentModificationException
> at java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1605)
> at java.base/java.util.HashMap$EntryIterator.next(HashMap.java:1638)
> at java.base/java.util.HashMap$EntryIterator.next(HashMap.java:1636)
> at java.base/java.util.AbstractMap.hashCode(AbstractMap.java:527)
> at
> org.apache.commons.jcs3.auxiliary.lateral.socket.tcp.LateralTCPService.update(LateralTCPService.java:158)
> at
> org.apache.commons.jcs3.auxiliary.lateral.LateralCache.processUpdate(LateralCache.java:105)
> at
> org.apache.commons.jcs3.auxiliary.AbstractAuxiliaryCacheEventLogging.updateWithEventLogging(AbstractAuxiliaryCacheEventLogging.java:65)
> at
> org.apache.commons.jcs3.auxiliary.AbstractAuxiliaryCacheEventLogging.update(AbstractAuxiliaryCacheEventLogging.java:50)
> at
> org.apache.commons.jcs3.engine.CacheAdaptor.handlePut(CacheAdaptor.java:90)
> at
> org.apache.commons.jcs3.engine.AbstractCacheEventQueue$PutEvent.doRun(AbstractCacheEventQueue.java:277)
> at
> org.apache.commons.jcs3.engine.AbstractCacheEventQueue$AbstractCacheEvent.run(AbstractCacheEventQueue.java:216)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
> at java.base/java.lang.Thread.run(Thread.java:1583)
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