call start on dynamic mbean

[dpfarr]

I've create a dynamic mbean and I export it with spring into Jboss

<bean id="exporter" 
  class="org.springframework.jmx.export.MBeanExporter"
  lazy-init="false">
  <property name="beans">
    <map>
      <entry key="bean:name=myConfigBean" value-ref="myConfigBean" />
    </map>
  </property>
</bean>

<bean id="myConfigBean" class="org.comp.myConfigBean" />

My Mbean is showing up in the JBoss JMXConsole...GREAT.

But it isn't calling start....not so great.

Is there a Spring way to invoke the start method in deployment?

[Joris Kuipers]

I once wrote a simple listener that would call 'start' and 'stop' on the MBeans of my choice for me. Here's the code:

public class MBeanStarter implements MBeanExporterListener {
    
    private static final Logger LOGGER = Logger.getLogger(MBeanStarter.class); 
    
    private MBeanServer mbeanServer;
    private Set objectNames = Collections.EMPTY_SET;

    public void mbeanRegistered(ObjectName objectName) {
        if (objectNames.contains(objectName.getCanonicalName())) {
            LOGGER.info("Invoking 'start' on MBean named " + objectName);
            try {
                mbeanServer.invoke(objectName, "start", null, null);
            } catch (Exception e) {
                LOGGER.error("Can't start MBean named " + objectName, e);
            }
        }
    }

    public void mbeanUnregistered(ObjectName objectName) {
        if (objectNames.contains(objectName.getCanonicalName())) {
            LOGGER.info("Invoking 'stop' on MBean named " + objectName);
            try {
                mbeanServer.invoke(objectName, "stop", null, null);
            } catch (Exception e) {
                LOGGER.error("Can't stop MBean named " + objectName, e);
            }
        }
    }

    public void setMbeanServer(MBeanServer mbeanServer) {
        this.mbeanServer = mbeanServer;
    }

    public void setObjectNames(Set objectNames) {
        this.objectNames = objectNames;
    }
}

You could use this in your applicationcontext; just inject the MBeanServer and a set of names (as Strings, not as ObjectNames) and register the bean as a listener in the exporter:

<bean id="exporter" 
  class="org.springframework.jmx.export.MBeanExporter"
  lazy-init="false">
  <property name="beans">
    <map>
      <entry key="bean:name=myConfigBean" value-ref="myConfigBean" />
    </map>
  </property>
  <property name="listeners">
    <list>
      <bean class="yourpackagename.MBeanStarter">
        <property name="mbeanServer" ref="mbeanServer"/>
        <property name="objectNames">
          <set>
            <value>bean:name=myConfigBean</value>
          </set>
        </property>
      </bean>
    </list>
  </property>
</bean>

This assumes you have configures an MBeanServer named "mbeanServer" somewhere in your xml.

Joris

[mobidev]

The call to the "stop" method does not work in my setup ( spring 2.5.4) as the method

public void mbeanUnregistered(ObjectName objectName)

will be called after un registering the bean.

See:
docs/2.5.x/api/org/springframework/jmx/export/MBeanExporterListener.html

mbeanUnregistered:

" Called by MBeanExporter after an MBean has been successfully  unregistered from an MBeanServer."

As a result javax.management.InstanceNotFoundException is thrown.


Any idea how to deal with this in version 2.5.x ?