Leon Rosenberg wrote:
starting tomcat:

22.09.2005 12:41:27 org.apache.coyote.tomcat5.MapperListener init
WARNUNG: Error registering contexts
java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:782)
        at java.util.HashMap$EntryIterator.next(HashMap.java:824)
        at java.util.HashMap.putAllForCreate(HashMap.java:424)
        at java.util.HashMap.clone(HashMap.java:656)
        at 
mx4j.server.DefaultMBeanRepository.clone(DefaultMBeanRepository.java:56)
        at 
mx4j.server.MBeanServerImpl.findMBeansByPattern(MBeanServerImpl.java:1603)
        at 
mx4j.server.MBeanServerImpl.queryObjectNames(MBeanServerImpl.java:1568)
        at mx4j.server.MBeanServerImpl.queryMBeans(MBeanServerImpl.java:1512)
        at 
org.apache.coyote.tomcat5.MapperListener.init(MapperListener.java:115)
        at 
org.apache.coyote.tomcat5.CoyoteConnector.start(CoyoteConnector.java:1510)

tomcat 5.0.25, jdk1.4, winxp

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Yes, the jmx.jar shipped with tomcat 5.0.2x has a bug that has been fixed by the mx4j people. Later tomcat releases (5.0.31? and 5.5.9>) include a newer version. The jar file is located in the tomcat bin directory and the solution is to download an updated version from

http://mx4j.sourceforge.net/

I think you need the latest 2.x version, not the 3.x version.

BTW. I'd really appreciate a stable 5.0.x release with this fix. This little issue has been driving me nuts since I need to fix this manually on all deployments of our product on tomcat 5.0.28.

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