JBossCacheManager.findLocalSessions concurrency issue

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.