"InstanceAlreadyExistsException" while exposing MBeans

[umark]

Env: Spring 2.0.7, JDK1.6

I am exposing my MBeans using RMI with the following configuration.
I keep getting the InstanceAlreadyExistsException. Could you pl tell me
where I have this wrong?

Regards

/U

My configuration is "MyJmxElements.xml:

  <bean
          id="MyBeanServer"
          class="org.springframework.jmx.support.MBeanServerFactoryBean"

          p:defaultDomain="UDomain"
        />

     <bean id="MyJmxRmiRegistry"
         class="org.springframework.remoting.rmi.RmiRegistryFactoryBean"
            p:port="9999"
     />

     <bean
         class="org.springframework.jmx.support.ConnectorServerFactoryBean"
         depends-on="MyJmxRmiRegistry"
            p:serviceUrl="service:jmx:rmi:///jndi/rmi://localhost:9999/server"
            p:objectName="connector:name=MyDomain"
     />

At context load, I get the exception as follows:

2007-12-16 13:49:09,305 ERROR [main] context.ContextLoader:204     - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.jmx.support.ConnectorServerFactoryBean#1' defined in class path resource [MyJmxElements.xml]: Invocation of init method failed; nested exception is javax.management.InstanceAlreadyExistsException: connector:name=MyDomain
Caused by:
javax.management.InstanceAlreadyExistsException: connector:name=MyDomain
        at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:453)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1484)

[umark]

I am running in Tomcat 6.0.14.
Also I have modified the MBeanServerFactoryBean as follows
to add the property p:locateExistingServerIfPossible="true".
I still get the same (InstanceAlreadyExistsException) exception:

 <bean
          id="MyMBeanServer"
          class="org.springframework.jmx.support.MBeanServerFactoryBean"
          
          p:defaultDomain="UDomain"
          p:locateExistingServerIfPossible="true"
        />

Pl help!

/U

[umark]

I am sorry for following up again on my post. I have been trying various
changes to see what would do the trick.

What is the purpose of the objectName property of org.springframework.jmx.support.ConnectorServerFac toryBean?
Why should I set them?

     <bean 
         class="org.springframework.jmx.support.ConnectorServerFactoryBean"
         depends-on="DmsJmxRmiRegistry"
            p:serviceUrl="service:jmx:rmi:///jndi/rmi://localhost:9999/server"
            p:threaded="true"
            p:objectName="connector:name=rmi"
     />

If I set the property (as shown above), I get the
javax.management.InstanceAlreadyExistsException as follows:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.jmx.support.ConnectorServerFactoryBean#1' defined in class path resource [MyJmxElements.xml]: Invocation of init method failed; nested exception is javax.management.InstanceAlreadyExistsException: connector:name=rmi
Caused by:
javax.management.InstanceAlreadyExistsException: connector:name=rmi
        at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:453)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(DefaultMBeanServerInterceptor.java:1484)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:963)
//...

But if I discard the property (I assume ConnectorServerFactoryBean assumes
a default), the exception does not appear.

Does the objectName property of ConnectorServerFactoryBean have any
correlation to the object names I use for my MBean server and my MBeans?

I am at my wits end - pl help!