Getting a queue size of an ActiveMQ queue using MBean (Spring JMX).

Spring Config file

<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xsi:schemalocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

 <bean class="org.springframework.jmx.support.MBeanServerConnectionFactoryBean" id="mbeanServerConnection">
  <property name="serviceUrl" value="service:jmx:rmi:///jndi/rmi://localhost:1099/jmxrmi">
 </property></bean>

 <bean class="com.sample.QueueSizeCounter" id="queueCounter">
  <property name="mBeanServerConnection" ref="mbeanServerConnection">
 </property></bean>

</beans>

• A class using the MBeanServerConnection to fetch the attribute from the MBean

package com.sample;

import javax.management.MBeanServerConnection;
import javax.management.ObjectName;

import org.apache.log4j.Logger;

public class QueueSizeCounter {

 private MBeanServerConnection mBeanServerConnection;

 private Logger logger = Logger.getLogger(QueueSizeCounter.class);

 public Long getQueueSize(String queueName) {
  Long queueSize = null;
  try {

   ObjectName objectNameRequest = new ObjectName(
     "org.apache.activemq:BrokerName=localhost,Type=Queue,Destination=" + queueName);

   queueSize = (Long) mBeanServerConnection.getAttribute(objectNameRequest, "QueueSize");

   return queueSize;
  }
  catch (Exception e) {
   logger.error(e.getMessage());
  }
  return queueSize;
 }

 public void setmBeanServerConnection(MBeanServerConnection mBeanServerConnection) {
  this.mBeanServerConnection = mBeanServerConnection;
 }

}

• Running the Queue Counter

package com.sample;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {

 public static void main(String[] args) {

  ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");

  QueueSizeCounter queueCounter = (QueueSizeCounter) ctx.getBean("queueCounter");

  String queueName = "Queue1";
  long queueSize = queueCounter.getQueueSize(queueName);

  System.out.println("Size of " + queueName + " : " + queueSize);
 }
}

Note : Try to set the below VM arguments if facing any problem connecting to JMX -

-Dcom.sun.management.jmxremote
-Dcom.sun.management.jmxremote.port=1099
-Dcom.sun.management.jmxremote.local.only=false
-Dcom.sun.management.jmxremote.authenticate=false
-Djava.rmi.server.hostname=localhost
-Dcom.sun.management.jmxremote.ssl=false