[ mx4j-Bugs-1596697 ] NPE on MBeanServerFactory when running as Windows Services

Bugs item #1596697, was opened at 2006-11-14 16:01
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=450647&aid=1596697&group_id=47745

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: JMX implementation
Group: Release 3.0.1
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: jefflin (jefflin2004)
Assigned to: Nobody/Anonymous (nobody)
Summary: NPE on MBeanServerFactory when running as Windows Services

Initial Comment:
Using Tomcat 5.5.9 and configured -Djavax.management.builder.initial=mx4j.server.MX4JMBeanServerBuilder for running as windows services. The following NullPointerException is thrown:

Nov 14, 2006 3:51:23 PM org.apache.catalina.startup.Bootstrap initClassLoaders
SEVERE: Class loader creation threw exception
java.lang.NullPointerException
        at javax.management.MBeanServerFactory.loadMBeanServerBuilderClass(MBean
ServerFactory.java:266)
        at javax.management.MBeanServerFactory.createMBeanServerBuilder(MBeanSer
verFactory.java:229)
        at javax.management.MBeanServerFactory.createMBeanServerImpl(MBeanServer
Factory.java:195)
        at javax.management.MBeanServerFactory.createMBeanServer(MBeanServerFact
ory.java:44)
        at javax.management.MBeanServerFactory.createMBeanServer(MBeanServerFact
ory.java:39)
        at org.apache.catalina.startup.Bootstrap.createClassLoader(Bootstrap.jav
a:188)
        at org.apache.catalina.startup.Bootstrap.initClassLoaders(Bootstrap.java
:97)
        at org.apache.catalina.startup.Bootstrap.init(Bootstrap.java:212)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409)
        
==

I noticed that inside MBeanServerFactory.loadMBeanServerBuilderClass(),  Thread.currentThread().getContextClassLoader() is null when it runs as a Widnows Services. The following code was added into MBeanServerFactory.java to fix the problem:

try
{
	 // new code - start
	 if (Thread.currentThread().getContextClassLoader() == null) {
		 Thread.currentThread().setContextClassLoader(ClassLoader.getSystemClassLoader());
	 }
	 // new code - end

 return Thread.currentThread().getContextClassLoader().loadClass(builderClassName);
}

Please 1) patch mx4j or 2) find out when Thread.currentThread().getContextClassLoader() == null



----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=450647&aid=1596697&group_id=47745

-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys - and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV