NullPointerException in ModelMBeanInvoker during startup
I have defined an XMBean following the JBoss admin and developer guide examples (starting at Page 119)
The XMBean descriptor validates ok against it's DTD, and I don't find any discrepencies between the descriptor and the implementing class.
During initialization, the XMBean fails to start, throwing a NullPointerException during registration
Relevant portion of the stack trace is below:
[java] Caused by: java.lang.NullPointerException
[java] at org.jboss.mx.modelmbean.ModelMBeanInvoker.preRegister(ModelMBeanInvoker.java:243)
[java] at javax.management.modelmbean.RequiredModelMBean.preRegister(RequiredModelMBean.java:218)
[java] at org.jboss.mx.modelmbean.ModelMBeanInvoker.preRegister(ModelMBeanInvoker.java:284)
[java] at org.jboss.mx.server.registry.BasicMBeanRegistry.registerMBean(BasicMBeanRegistry.java:148)
[java] at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
[java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[java] at java.lang.reflect.Method.invoke(Method.java:324)
[java] at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
[java] at org.jboss.mx.interceptor.ObjectReferenceInterceptor.invoke(ObjectReferenceInterceptor.java:59)
[java] at org.jboss.mx.interceptor.MBeanAttributeInterceptor.invoke(MBeanAttributeInterceptor.java:43)
[java] at org.jboss.mx.interceptor.PersistenceInterceptor2.invoke(PersistenceInterceptor2.java:93)
[java] at org.jboss.mx.server.MBeanInvoker.invoke(MBeanInvoker.java:75)
[java] at javax.management.modelmbean.RequiredModelMBean.invoke(RequiredModelMBean.java:141)
[java] at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
[java] at org.jboss.mx.server.MBeanServerImpl.registerMBean(MBeanServerImpl.java:994)
[java] at org.jboss.mx.server.MBeanServerImpl.registerMBean(MBeanServerImpl.java:954)
[java] at org.jboss.mx.server.MBeanServerImpl.createMBean(MBeanServerImpl.java:322)
[java] at org.jboss.system.ServiceCreator.install(ServiceCreator.java:114)
[java] at org.jboss.system.ServiceConfigurator.internalInstall(ServiceConfigurator.java:155)
[java] at org.jboss.system.ServiceConfigurator.install(ServiceConfigurator.java:118)
Any ideas on what I am doing that could cause this?
Poking around in the source code (3.2.1), the only two lines in preRegister( ) that are likely to be causing a nullPointerException are these:
Descriptor mbeanDescriptor = infoSupport.getMBeanDescriptor();
mbeanDescriptor.setField(.......
....
Either mbeanDescriptor or infoSupport is null (I don't think the CVS version I was looking at is the right one, so I went with the method name instead of trusting the line number)
I could not attach the xml xmbean descriptor file due to an error in this site.
