Example 5.6. Defining the xdoclet classpath and Ant task.

<path id="xdoclet">
  <pathelement location="${lib}/xdoclet.jar"/>
  <pathelement location="${lib}/log4j.jar"/>
  <pathelement location="${ANT_HOME}/lib/ant.jar"/>
  <pathelement location="${build}"/>
</path>
<taskdef name="jmxdoclet" classname="xdoclet.jmx.JMXDocletTask">
  <classpath refid="xdoclet"/>
</taskdef>

Example 5.7.

<target name="generate-jmx" depends="init">
	<!-- Generate the MBean interfaces and descriptions -->
	<jmxdoclet sourcepath="${src}" destdir="${src}" classpathref="xdoclet" force="yes">
		<fileset dir="${src}">
			<include name="com/xtremejava/webos/**" />
		</fileset>
		<!-- Create the {0}MBean interface for the MBean -->
		<mbeaninterface/>
		<!-- Create the OpenJMX specific description adaptor class for the MBean -->
		<openjmxDescription />
		<!-- Generate the mlet file -->
		<mlet destinationFile="mbeans.mlet" destdir="conf"/>
	</jmxdoclet>
</target>

Example 5.8. MBeanOne implementation

			public class MBeanOne extends FilePersister implements Serializable
			{
				public MBeanOne(String location, String name) throws MBeanException
    				{
					super(location, name);
    				}

				public void store(Object mbean)throws MBeanException, InstanceNotFoundException
				{
					store(mbean);
				}

				public Object load()throws MBeanException, RuntimeOperationsException, InstanceNotFoundException
				{
					return load();
				}
			}
			

Example 5.9. MBeanTwo implementation

public class MBeanTwo implements MBeanTwoMBean, Serializable			
{
	// constructor... see example 
	//we are now going to invoke MBeanOne through the MBeanServer
	public void storeIt(MBeanServer server, ObjectName name)
	{
		server.invoke(name, "store", new Object[]{this}, new String[]{"java.lang.Object"});
	}

	public Object loadIt(MBeanServer server, ObjectName name)
	{
		Object me = null;
		try
		{
			me = (MBeanTwo)server.invoke(name, "load", new Object[0], new String[0]);
		}
		catch (Exception ex)
		{
			ex.printStackTrace();
		}
		return me;
	}
			

Example 5.10. The FilePersisterAgent

			// create the mbeanServer
			// build the obejctNames for the MLets
			// register the MLets
			MLet mlet1 = new MLet();
			m_server.registerMBean(mlet1, mName1);
			mlet1.addURL(jarOneUrl);
			
			MLet mlet2 = new MLet();
			m_server.registerMBean(mlet2, mName2);
			mlet2.addURL(jarTwoUrl);
			
			// we now have access to the MBeans, so instantiate them
			m_server.createMBean(mbeanClassName, mbeanObjectName, mLetObjectName, params, signature);
			
			// as above but the other mbean is now registered using the othe MLet object name as the third parameter
			m_server.createMBean(.....); 
			
			// now invoke the storage of one MBean by the other
			m_server.invoke(mbeanName2, "storeIt", new Object[] {m_server, mbeanName1},
			             new String[]{"javax.management.MBeanServer", "javax.management.ObjectName"});
			
			// now load it
			Object a = m_server.invoke(mbeanName2, "loadIt", new Object[] {m_server, mbeanName1},
					     new String[]{"javax.management.MBeanServer", "javax.management.ObjectName"});
			
			// and finally a test to see that the objects are equal
			if(a.getClass().getName() == mbeanClass2) System.out.println("Objects are equal and the same");
			

Example 5.11.

			jar cvf one.jar examples/tools/persister/MBeanOne.class 
			// and then
			jar cvf two.jar examples/tools/persister/MBeanTwo.class examples/tools/persister/MBeanTwoMBean.class