I am using JBoss 4.0.2 and have written some code to perform a query on an MBean server, but I get a concurrent modification exception. The stack trace is:

java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:782)
at java.util.HashMap$ValueIterator.next(HashMap.java:812)
at org.jboss.mx.server.registry.BasicMBeanRegistry.findEntries(BasicMBeanRegistry.java:634)
at org.jboss.mx.server.MBeanServerImpl.queryNames(MBeanServerImpl.java:492)

Has anyone else encountered this problem? Surely I am not supposed to synchronise all access to the MBean server?

Thanks in advance.