[jboss-jira] [JBoss JIRA] Created: (JBAS-4075) JBossCacheManager.findLocalSessions concurrency issue

[Hany Mesha (JIRA)]

JBossCacheManager.findLocalSessions concurrency issue
-----------------------------------------------------

                 Key: JBAS-4075
                 URL: http://jira.jboss.com/jira/browse/JBAS-4075
             Project: JBoss Application Server
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: Clustering
    Affects Versions: JBossAS-4.0.5.GA
         Environment: SLES 9, SP3.
JBOSS 4.0.5.GA
            Reporter: Hany Mesha
         Assigned To: Brian Stansberry


When running a load test on a JBoss Cluster I see the following exception

2007‑02‑06 14:23:58,231 ERROR
[org.jboss.web.tomcat.tc5.session.JBossCacheManager:processExpires]
processExpires: failed with exception: java.util.NoSuchElementException
java.util.NoSuchElementException
        at
EDU.oswego.cs.dl.util.concurrent.ConcurrentHashMap$HashIterator.next(ConcurrentHashMap.java:1131)
        at java.util.AbstractCollection.toArray(AbstractCollection.java:176)
        at
org.jboss.web.tomcat.tc5.session.JBossCacheManager.findLocalSessions(JBossCacheManager.java:851)
        at
org.jboss.web.tomcat.tc5.session.JBossCacheManager.processExpires(JBossCacheManager.java:1188)
        at
org.jboss.web.tomcat.tc5.session.JBossManager.backgroundProcess(JBossManager.java:817)
        at
org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1284)
        at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1569)
        at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1578)
        at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1578)
        at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1558)
        at java.lang.Thread.run(Thread.java:595)


Upon further investigation and looking at the source code of JBossCacheManager in 4.0 branch, the method findLocalSessions() suffers from concurrency issue when calling java.util.AbstractCollection.toArray(Object[] array) which is not thread safe.

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