Exception when using the cache from different threads (synchronization problems)
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Key: JCS-76
URL: https://issues.apache.org/jira/browse/JCS-76
Project: 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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