CODEWITHSUNDEEP
javajmx
Tyler Hobbs
Tyler Hobbs

Reputation: 6932

Determine Java version through JMX

I'm looking to remotely determine the version of Java that a particular process is running on through JMX. Specifically, I would like something like "1.6.0_26", which is what System.getProperty("java.version") would return.

Through the RunTime MBean, I can check the VmName and VmVersion attributes, which give "Java HotSpot(TM) 64-Bit Server VM" and "20.1-b02", respectively. I'm not sure where the "20.1-b02" comes from; is there a way to match that to the "1.6.0_26" version?

Upvotes: 1

Views: 2775

Answers (2)

accuweaver
accuweaver

Reputation: 21

Turns out that older versions of the JVM / JMX return the wrong thing for specVersion, so using the technique that @Kent provided works much better:

        getLogger().finest("Checking JVM version");
    String specVersion = ManagementFactory.getRuntimeMXBean().getSpecVersion();
    getLogger().log(Level.FINEST, "Specification Version from JMX = ''{0}''", specVersion);

    // Because of bug in the above call, earlier versions of JMX reported the version of
    // JMX and not Java (so 1.6 reports 1.0 - replacing with the call below fixes this problem
    // and consistently returns the specification of the JVM that is being used.
    String javaVersion = ManagementFactory.getRuntimeMXBean().getSystemProperties().get("java.specification.version");
    getLogger().log(Level.FINEST, "java.specification.version found ''{0}''", javaVersion);

Upvotes: 0

Marcel Stör
Marcel Stör

Reputation: 23525

A number of hints for the java.lang.Runtime bean:

  • SpecVersion
  • LibraryPath/BootClassPath (most likely in the folder name)
  • SystemProperties -> java.runtime.version

Edit

As @Kent pointed out java.lang.management.RuntimeMXBean.getSystemProperties() in code is the same as SystemProperties -> java.runtime.version in a JMX client like JConsole.

Upvotes: 4

Related Questions