2 Replies Latest reply on Feb 9, 2007 3:49 PM by vbatista

JbossCache 1.4.1 problem/bug

vbatista Feb 7, 2007 10:33 PM

Hi!
I have just migrated JbossCache from version 1.2.4-SP2 to version 1.4.1 (I am using Jboss 4.0.3-SP1 and JVM 1.5).
While initializing the cache, I was getting the following error:
java.lang.NullPointerException
at org.jboss.cache.TreeCache.getMBeanServer(TreeCache.java:6484)
at org.jboss.cache.TreeCache._createService(TreeCache.java:1383)
at org.jboss.cache.TreeCache.createService(TreeCache.java:1346)
at org.jboss.system.ServiceMBeanSupport.jbossInternalCreate(ServiceMBeanSupport.java:245)
at org.jboss.system.ServiceMBeanSupport.create(ServiceMBeanSupport.java:173)
at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:265)
at org.jboss.system.ServiceMBeanSupport.start(ServiceMBeanSupport.java:181)

With version 1.2.4 everything was working fine. Loooking to JbossCache src code, the NullPointer occurs on the line server.getDefaultDomain().equalsIgno... :

// return 'jboss' server if available
for (int i = 0; i < servers.size(); i++)
{
MBeanServer server = (MBeanServer) servers.get(i);
if (server.getDefaultDomain().equalsIgnoreCase(JBOSS_SERVER_DOMAIN))
return server;
}

While looking for a solution to the problem, I realized that I was using the default JVM MBeanServer for Jboss:
-Djboss.platform.mbeanserver

This is the problem. I commented the option above, and everything worked fine. Why am I getting the NullPointerException. Does the call to server.getDefaultDomain() on the default MBeanServer returns Null?

Thanks in advance.
Best Regards,
Victor Batista

1. Re: JbossCache 1.4.1 problem/bug

manik Feb 9, 2007 7:51 AM (in response to vbatista)

Perhaps you could add a log message to see where the null is. What happens if you leave out the -Djboss.platform.mbeanserver option?
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2. Re: JbossCache 1.4.1 problem/bug

vbatista Feb 9, 2007 3:49 PM (in response to vbatista)

Hi!
Thanks for your reply.
I confirm the error. I checked out the JBossCache src code and inserted some debug.
When I run JBoss configured to use the default JVM MBeanServer (JAVA_OPTS="$JAVA_OPTS -Djboss.platform.mbeanserver"), the call server.getDefaultDomain() returns null (It seems that the JVM is starting its MBean server with a null Default Domain). If I start the JVM without sharing the MBeanServers, the call server.getDefaultDomain() returns "jboss". In both cases I have obly one MBeanServer (It seems that the default JVM MBeanServer isn't created by default, only when it is needed).

Below we can see the Debug I have inserted. If I got a null Default Domain I was printing its domains (there are no java domains).
2007-02-09 18:10:05,340 INFO [org.jboss.cache.TreeCache] PTECH Found 1 MBean Servers.
2007-02-09 18:10:05,340 INFO [org.jboss.cache.TreeCache] .PTECH:null (server.getDefaultDomain())
2007-02-09 18:10:05,340 INFO [org.jboss.cache.TreeCache] PTECH MBean Server Default DOMAIN is NULL. Ignoring it. MBeanServer:org.jboss.system.server.jmx.LazyMBeanServer@166f936
2007-02-09 18:10:05,340 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.deployment
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jmx.loading
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.web
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.rmi
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:pt.ptinovacao.wappremium
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.security
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:Catalina
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.jdbc
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.mq
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.jca
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.bean
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.j2ee
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.jms
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.aop
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.net
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.jmx
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.web.deployment
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.cache
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.mq.destination
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:JMImplementation
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.deployer
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.ejb
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.system
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.alerts
2007-02-09 18:10:05,341 INFO [org.jboss.cache.TreeCache] ..PTECH: Domain:jboss.management.local

I started with JbossCache-1.4.1.GA. I repeated the process with JbossCache-1.4.1.SP1 and I have exactly the same problem.

Thanks in advance.
Regards,
Victor Batista
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