JMX Components

I have seen several postings asking about integration between Seam and JMX.

Here is a simple approach for registering a POJO as an MBean and a Component.

Objectives

• Use Seam to register an MBean so that it can be configured via JMX Console
• Inject the MBean like any other component

Example

Here is the configuration:

	<jmx:managed-bean name="echoService"
		objectName="net.taylor.jmx:service=EchoService"
		type="net.taylor.jmx.EchoServiceMBean"
		implementation="net.taylor.jmx.EchoService"
	/>

Here is injections:

	@In
	private EchoService echoService;

Here is the component code:

@Scope(ScopeType.APPLICATION)
@AutoCreate
@Startup
@BypassInterceptors
public class ManagedBean {

	private String objectName;

	private Class<?> type;

	private Class<?> implementation;

	private String agentId;

	private ObjectName _objectName;

	private MBeanServer server;

	private Object mbean;

	// setters/getters

	@Create
	public void create() throws Exception {
		List<MBeanServer> servers = MBeanServerFactory.findMBeanServer(agentId);
		server = servers.get(0);
		
		_objectName = new ObjectName(objectName);
		mbean = MBeanProxy.create(implementation, type, _objectName, server);
	}

	@Destroy
	public void destroy() throws Exception {
		server.unregisterMBean(_objectName);
	}

	@Unwrap
	public Object getMBean() {
		return mbean;
	}
}

Here is the full code: ManagedBean.java