[jboss-dev-forums] [Design of EJB 3.0] - Re: Passivating EJB 3 Stateful Session Beans stops the World

[andy.miller@jboss.com]

"wolfc" wrote : That takes care of the cache configuration, but I also want to know what's behind this passivation issue.
  | 
  | Is passivating or activating the culprit?
  | On what OS is this?
  | 
  | If it was the sync on cacheMap I would say a deadlock would happen, not some timeout of 30 seconds.

The issue is clearly passivation.  The passivation count is zero on the first occurrence, and everything hangs, and then the passivation count is non-zero.  The only time the hang occurs is when passivation happens.  My typical response times on calling the stateful session bean and returning with the result set are between 7 and 40ms.

This is being run on Fedora 9, with our OpenJDK 6 JVM.

After rebuilding with the AS 5 CR 2 libraries, the problem does go away, because I now have confirmed that I'm using the StatefulTreeCache, which is the default in the ejb3-interceptors-aop.xml based on the fact that I only have the @Clustered annotation:


  | <!-- Clustered cache configuration -->
  |       <annotation expr="!class(@org.jboss.ejb3.annotation.Cache) AND class(@org.jboss.ejb3.annotation.Clustered)">
  |          @org.jboss.ejb3.annotation.Cache ("StatefulTreeCache")
  |       </annotation>
  |       <annotation expr="!class(@org.jboss.ejb3.annotation.CacheConfig) AND class(@org.jboss.ejb3.annotation.Clustered)">
  |          @org.jboss.ejb3.annotation.CacheConfig (name="jboss.cache:service=EJB3SFSBClusteredCache", maxSize=100000, idleTimeoutSeconds=300, removalTimeoutSeconds=0)
  |       </annotation>
  | 

Clearly the synchronization in the SimpleStatefulCache is a real problem.  If I weren't running in a clustered configuration (and didn't have the issue I had because I didn't rebuild with the AS 5 libraries), I would still have the same problem.

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