MBeanServer connection = ManagementFactory.getPlatformMBeanServer();Set<ObjectInstance> set = connection.queryMBeans(new ObjectName("java.lang:type=Memory"), null);ObjectInstance oi = set.iterator().next();// replace "HeapMemoryUsage" with "NonHeapMemoryUsage" to get non-heap memObject attrValue = connection.getAttribute(oi.getObjectName(), "HeapMemoryUsage");if( !( attrValue instanceof CompositeData ) ) { System.out.println( "attribute value is instanceof [" + attrValue.getClass().getName() + ", exitting -- must be CompositeData." ); return;}// replace "used" with "max" to get maxSystem.out.println(((CompositeData)attrValue).get("used").toString());
