It's often convenient to run jcmd command programmatically from within a testcase to get some information or to adjust options.

See the template below:

// import javax.management.ObjectName;
// import javax.management.MBeanServer;

 public static void reloadCompilerDirectives(String filename) {
    String result;
    result = doRunDcmd("compilerDirectivesClear", new String[]{""});
    result = doRunDcmd("compilerDirectivesAdd", new String[]{ filename });
  }

  private static String doRunDcmd(String operationName, String operationArgs[]) {
      ObjectName objectName = 
          new ObjectName("com.sun.management:type=DiagnosticCommand");
      MBeanServer mbeanServer = 
          ManagementFactory.getPlatformMBeanServer();
      Object[] params = new Object[] { operationArgs };
      String[] signature = new String[]{ String[].class.getName() };
      return(String) mbeanServer.invoke(objectName, operationName, params, signature);
  }

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Published: 03 February 2023

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