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

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, JBossAS-5.0.0.Beta1, JBossAS-4.0.4.GA Environment: SLES 9, SP3. JBOSS 4.0.5.GA Reporter: Hany Mesha Assigned To: Brian Stansberry Fix For: JBossAS-5.0.0.Beta2, JBossAS-4.2.0.GA, JBossAS-4.0.5.SP1 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.