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https://issues.apache.org/jira/browse/JCS-76?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13428620#comment-13428620
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Thomas Vandahl commented on JCS-76:
-----------------------------------
Any more information in what environment this happens?
> Exception when using the cache from different threads (synchronization
> problems)
> --------------------------------------------------------------------------------
>
> Key: JCS-76
> URL: https://issues.apache.org/jira/browse/JCS-76
> Project: Commons JCS
> Issue Type: Bug
> Components: Composite Cache
> Reporter: Alexander Sofronov
> Assignee: Aaron Smuts
>
> Recently we switched our product into parallel mode, so now we are using JCS
> cache from different threads. And it looks like there are some problems with
> synchronization inside JCS, sometimes we are getting the following error:
> Caused by: java.lang.Error: update: last is null!
> at
> org.apache.jcs.engine.memory.AbstractDoulbeLinkedListMemoryCache.spoolLastElement(AbstractDoulbeLinkedListMemoryCache.java:280)
> at
> org.apache.jcs.engine.memory.AbstractDoulbeLinkedListMemoryCache.spoolIfNeeded(AbstractDoulbeLinkedListMemoryCache.java:154)
> at
> org.apache.jcs.engine.memory.AbstractDoulbeLinkedListMemoryCache.update(AbstractDoulbeLinkedListMemoryCache.java:106)
> at
> org.apache.jcs.engine.control.CompositeCache.copyAuxiliaryRetrievedItemToMemory(CompositeCache.java:993)
> at
> org.apache.jcs.engine.control.CompositeCache.get(CompositeCache.java:566)
> at
> org.apache.jcs.engine.control.CompositeCache.get(CompositeCache.java:429)
> at org.apache.jcs.access.CacheAccess.get(CacheAccess.java:192)
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