Jmx:standard MBean

The Standard Mbean consists of an interface and an implementation class .

Naming conventions:

Interface: Xxxmbean

Implementation class: XXX

By convention, the name of the Mbean is xxx. Self-determined.

Each method in the interface defines an attribute or operation.

A method that begins with a GET or set: if it conforms to the getter or setter pattern, it defines an attribute, a return value type of getter, or a setter parameter type.

Other method: defines a operation.

Example:

Package Test.xue.mbean;

Public interface Hellombean {public
	void SayHello ();
	public int Add (int x, int y);
	
	Public String getName ();
	
	public int getcachesize ();
	public void setcachesize (int size);
	
	public void SetText ();
	public void Settitle (String title);
}

The Hellombean interface defines 3 attributes and 3 operation:

Attributes

Name:readonly

Cachesize:readable and writable

Title:writable

Operations

SayHello

Add

SetText: does not conform to setter mode.

Implementation class:

Package Test.xue.mbean;

public class Hello implements Hellombean {
	
	private final String name = ' My Hellombean ';
	private int cacheSize = 1024;
	Private String title;

	@Override public
	void SayHello () {
		System.out.println ("Hello, My Hellombean");
	}

	@Override public
	int Add (int x, int y) {return
		x+y;
	}

	@Override public
	String GetName () {return
		name;
	}

	@Override public
	int getcachesize () {return
		cacheSize;
	}

	@Override public
	void setcachesize (int size) {
		this.cachesize = size;
		System.out.println ("CacheSize changed:" + size);
	}

	@Override public
	void SetText () {
		System.out.println ("SetText called");
	}
	
	@Override public
	void Settitle (String title) {
		this.title = title;
		System.out.println ("title changed:" + title);
	}

Above, Hellombean and hello define an Mbean that allows you to manage specific resources through the operation and attributes of this mbean.

You can now create a JMX agent to manage resources through an mbean.

Package test.xue.mbean.management;

Import Java.lang.management.ManagementFactory;
Import javax.management.InstanceAlreadyExistsException;
Import javax.management.MBeanRegistrationException;
Import Javax.management.MBeanServer;
Import javax.management.MalformedObjectNameException;
Import javax.management.NotCompliantMBeanException;

Import Javax.management.ObjectName;

Import Test.xue.mbean.Hello; public class Helloagent {public static void main (string[] args) throws Malformedobjectnameexception, Nullpointerexcep tion, instancealreadyexistsexception, mbeanregistrationexception, Notcompliantmbeanexception, InterruptedException
		{Mbeanserver Server = Managementfactory.getplatformmbeanserver (); ObjectName name = new ObjectName ("Test.xue.mbean:type=hello"); Any name//objectname name = new ObjectName ("Test.xue.mbean22:type=hello2");
		Also works Hello Mbean = new Hello ();

		Server.registermbean (Mbean, name); System.out.println ("Waiting" for remote management...");
	Thread.Sleep (Long.max_value); }
}

As above, each mbean requires a objectname,objectname naming convention:

Domain: (key=value) +

The Domain=test.xue.mbean,type=hello in the example can be arbitrarily specified.

This JMX agent can be tested by jconsole

Run: Jconsole

After the connection,

You can try to modify attributes, call operations, and note the console output.

If Javax.management.NotCompliantMBeanException appears:

Exception in thread ' main ' Javax.management.NotCompliantMBeanException:MBean class Test.xue.mbean.Hello2 does not Implement Dynamicmbean, neither follows the Standard MBean conventions (javax.management.NotCompliantMBeanException: Class Test.xue.mbean.Hello2 is not a JMX compliant Standard Mbean) nor the MXBean conventions (Javax.management.NotComplia NtMBeanException:test.xue.mbean.Hello2:Class Test.xue.mbean.Hello2 isn't a JMX compliant MXBean) at
	Com.sun.jmx.mbeanserver.Introspector.checkCompliance (Unknown Source) at
	Com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean (Unknown Source) at
	Com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean (Unknown Source) at
	Test.xue.mbean.management.HelloAgent.main (helloagent.java:24)

The possible causes are:

The name of the interface and implementation class does not conform to the naming specification: Xxxmbean, XXX.