Dumb tomcat JMX client question

[zebthecat]

Hope someone can help.

What I'd like to do is list tomcat sessions and destroy them, if required, in my Spring web-app and am stuck.

I've switched JMX remoteing (not that I think I need it) on using JVM params and have found the tomcat management bean that does what I require in JConsole.

My question is:
How do I configure and use this MBean in Spring?

I tried this:

<bean id="mbeanServer" class="org.springframework.jmx.support.MBeanServerFactoryBean">
   		<property name="locateExistingServerIfPossible" value="true"></property>
	</bean> 

	<bean id="sessionProxy" class="org.springframework.jmx.access.MBeanProxyFactoryBean">
   		<property name="objectName" value="Catalina:type=Manager,path=/ep4,host=localhost"/>
   		<property name="proxyInterface" value="javax.management.modelmbean.ModelMBean"/>
		<property name="server" ref="mbeanServer"/>
	</bean>

and injected the sessionProxy into a controller but I keep getting this Error or something similar:

org.springframework.jmx.access.InvalidInvocationException: Attribute 'MBeanInfo' is not exposed on the management interface

I know I've got the bean name correct but have probably missed something obvious.

If the answer is RTFM; which M do I Fing R.

Thanks

[Marten Deinum]

Find out which interfaces the specific bean implements. Spring tries to call the getMBeanInfo method (that is specified on the interface) but apparently that isn't implemented by the underlying class.

[zebthecat]

...as JConsole told me the MBean's class was an org.apache.commons.modeler.BaseModelMBean which implements
javax.management.modelmbean.ModelMBean (amongst others)

which includes the getMBeanInfo() method.

DEBUG logging org.springframework.jmx doesn't give me any clues either.

I have definitely missed something - Thanks anyway

[zebthecat]

Was barking up the wrong tree on this one. Was an easy fix in the end.

Added a jmxServices bean:

<bean id="jmxServices" class="com.globalfilings.services.JMXServices">
		<property name="managerName" value="Catalina:type=Manager,path=/ep4,host=localhost"/>
		<property name="server" ref="mbeanServer"/>
	</bean>

and called this bit of code:

public List getSessionIds() {
		List sessionList = null;
		try {
			ObjectName contextObjectName = new ObjectName(getManagerName());
			String olist = (String)server.invoke(contextObjectName, "listSessionIds", null, null);
		   	sessionList = new ArrayList(Arrays.asList(olist.split(" ")));
		} catch (Exception e) {
			log.error(e);
		}
		return sessionList;
	}

to get at the sessions and this:

public void expireSession(String sessionId){
		ObjectName contextObjectName;
		try {
			contextObjectName = new ObjectName(getManagerName());
			server.invoke(contextObjectName, "expireSession", new String[]{sessionId}, new String[]{"java.lang.String"});
		} catch (Exception e) {
			log.error(e);		
		} 
	}

to destroy an existing session; easy peasy.