How do I access memory usage programmatically via JMX?

by

You need to setup a JMXConnector. Here is a code snippet that will get the committed heap memory usage on a remote machine.

String host ="myHost";
int port = 1234;
HashMap map = new HashMap();
String[] credentials = new String[2];
credentials[0] = user;
credentials[1] = password;
map.put("jmx.remote.credentials", credentials);
JMXConnector c = JMXConnectorFactory.newJMXConnector(createConnectionURL(host, port), map);
c.connect();
Object o = c.getMBeanServerConnection().getAttribute(new ObjectName("java.lang:type=Memory"), "HeapMemoryUsage");
CompositeData cd = (CompositeData) o;
System.out.println(cd.get("committed"));

private static JMXServiceURL createConnectionURL(String host, int port) throws MalformedURLException
{
    return new JMXServiceURL("rmi", "", 0, "/jndi/rmi://" + host + ":" + port + "/jmxrmi");
}

If you don’t care about security you can set the map to null. You need to start up the remote server with;

-Dcom.sun.management.jmxremote.port=1234
-Dcom.sun.management.jmxremote.authenticate=false
-Dcom.sun.management.jmxremote.ssl=false

You might want to take a look at wlshell which is a small utility that allows you to access MBeans on a remote server using a text interface or a script, It can be used with WebLogic, but it works for any Java program where you have enabled remote monitoring.

More Related Contents:

  1. How to activate JMX on my JVM for access with jconsole?
  2. Calling JMX MBean method from a shell script
  3. Remote JMX connection
  4. Connecting remote tomcat JMX instance using jConsole
  5. Why Java opens 3 ports when JMX is configured?
  6. How do you enable JMX in Websphere?
  7. How do you Force Garbage Collection from the Shell?
  8. JConsole over ssh local port forwarding
  9. How to access JMX interface in docker from outside?
  10. How to get percentage of CPU usage of OS from java
  11. how to access single element in array for example how can i get mark age
  12. Can we instantiate an abstract class?
  13. What are enums and why are they useful?
  14. Why must wait() always be in synchronized block
  15. Convert Iterable to Stream using Java 8 JDK
  16. How can I measure distance and create a bounding box based on two latitude+longitude points in Java?
  17. Difference between spring @Controller and @RestController annotation
  18. How to send data from DialogFragment to a Fragment?
  19. Binding a list in @RequestParam
  20. How to cast List to List
  21. Closing BufferedReader and System.in
  22. Iterate two Java-8-Streams together [duplicate]
  23. How to use POMs as a dependency in Maven?
  24. Change database schema during runtime based on logged in user
  25. Why is Java’s division broken?
  26. Catching nullpointerexception in Java [closed]
  27. What is the default maximum heap size for Sun’s JVM from Java SE 6?
  28. How can I print a custom paper size (cheques 8″ x 4″)?
  29. Java: is there no AtomicFloat or AtomicDouble?
  30. How to handle full period in java.time?

Leave a Comment