What is JMX= JAVA Management Extension

JMX= JAVA Management Extension

Name itself suggest it is extension provided by JAVA for managing  JAVA Application/System my monitoring application performance problem, some critical events like quick increase in network traffic and decrease in application performance. With using JMX we can notify the developer about such behavior of the application using JMX console. In JDk 8 you can refer to this command in bin folder of java i.e. jmc.

Lets try to learn basics of JMX and learn how to use JConsole to connect and manage MBeans.

Step 1- Create MBean. It should be interface in nature. The interface name must end with MBean.

package com.test.siddhu;

public interface SiddhuMBean {

        

    public void setMyCount(int myCount);

    public int getMyCount();

    

    public void setMyName(String schemaName);

    public String getMyName();

    

    // Method started with get and set are considered as attributes for getter and setter methods

    // We are using do* for perform action.

    public String doAction();

}

Step 2- Provide the actual implementation of the MBean interface. As per the standard of JMX Naming convention we need to keep implementation class name as same of interface except– MBean. So my implementation class will be Siddhu.

package com.test.siddhu;

public class Siddhu implements SiddhuMBean {

    private int myCount;

    private String myName;

   

   

       @Override

       public void setMyCount(int myCount) {

              // TODO Auto-generated method stub

              this.myCount=myCount;

             

       }

       @Override

       public int getMyCount() {

              // TODO Auto-generated method stub

              return this.myCount;

       }

       @Override

       public void setMyName(String myName) {

              // TODO Auto-generated method stub

                this.myName=myName;

             

       }

       @Override

       public String getMyName() {

              // TODO Auto-generated method stub

              return this.myName;

       }

       @Override

       public String doAction() {

              // TODO Auto-generated method stub

              return "My Count="+this.myCount+" and My Name="+this.myName;

       }

    

       

}

Step 3- Now register our MBean implementation to the MBean server. We are using SiddhuActionManagement class for this. After registering MBean,To check our application is on we will print out mycount and myName value frequently. But same operation we will stop once we declare out myCount value as 0.

 

Click on Jconsole in bin folder of JAVA

Change value from 1 to 0 and we will see our application get stop.

If we change the name in the jconsole we found at run time with out changing the java class out put is changed