javax.management

---

1. Registering and Unregistering MBeans

// Register an MBean
MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName("com.example:type=Foo");
Foo mbean = new Foo();
mbeanServer.registerMBean(mbean, objectName);

// Unregister an MBean
mbeanServer.unregisterMBean(objectName);

2. Retrieving MBean Attributes

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName("com.example:type=Foo");
Object attributeValue = mbeanServer.getAttribute(objectName, "Name");

3. Setting MBean Attributes

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName("com.example:type=Foo");
mbeanServer.setAttribute(objectName, new Attribute("Name", "New Name"));

4. Invoking MBean Operations

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName("com.example:type=Foo");
Object result = mbeanServer.invoke(objectName, "sayHello", new Object[] {"John"}, new String[] {"java.lang.String"});

5. Sending Notifications from MBeans

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName("com.example:type=Foo");
Foo mbean = new Foo();
mbeanServer.registerMBean(mbean, objectName);

mbean.sendNotification(new Notification("FooNotification", "com.example:source=Foo", 100, "Foo Notification"));

6. Receiving Notifications using Notification Listeners

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName("com.example:type=Foo");
Foo mbean = new Foo();
mbeanServer.registerMBean(mbean, objectName);

NotificationListener listener = new NotificationListener() {
    public void handleNotification(Notification notification, Object handback) {
        // Process the notification
    }
};

mbeanServer.addNotificationListener(objectName, listener, null, null);

7. Creating a Composite Data Attribute

CompositeData support = new CompositeDataSupport(
        new ObjectName("com.example:type=Support"),
        new String[] {"firstName", "lastName", "phoneNumber"},
        new Object[] {"John", "Doe", "[phone]"});

8. Creating a Tabular Data Attribute

TabularData support = new TabularDataSupport(
        new ObjectName("com.example:type=Support"),
        new String[] {"firstName", "lastName", "phoneNumber"},
        new String[][] {
                {"John", "Doe", "[phone]"},
                {"Jane", "Smith", "[phone]"}
        });

9. Creating an Array Attribute

String[] hobbies = {"Reading", "Coding", "Hiking"};

10. Creating a Model MBean

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName("com.example:type=Foo");
ModelMBean modelMBean = new ModelMBeanInfoSupport(Foo.class, "Foo Management Bean");
mbeanServer.registerMBean(modelMBean, objectName);

11. Creating a Dynamic MBean

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName("com.example:type=Foo");
DynamicMBean mbean = new StandardMBean(Foo.class, true);
mbeanServer.registerMBean(mbean, objectName);

12. Using JMX Connectors

JMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://localhost:1099/jmxrmi");
JMXConnector jmxConnector = JMXConnectorFactory.connect(url);
MBeanServerConnection mbeanServerConnection = jmxConnector.getMBeanServerConnection();

13. Monitoring MBeans with JMX Timers

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName("com.example:type=Foo");
Foo mbean = new Foo();
mbeanServer.registerMBean(mbean, objectName);

Timer timer = new Timer();
timer.schedule(new TimerTask() {
    public void run() {
        // Perform monitoring operations on the MBean
    }
}, 1000, 1000);

14. Using JMX Instrumentation for Performance Monitoring

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName("com.example:type=Foo");
Foo mbean = new Foo();
mbeanServer.registerMBean(mbean, objectName);

MXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, FooMXBean.class);
long methodInvocationCount = mxbean.getMethodInvocationCount();

15. Using JMX Instrumentation for Thread Monitoring

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName("com.example:type=ThreadPool");
ThreadPool mbean = new ThreadPool();
mbeanServer.registerMBean(mbean, objectName);

MXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, ThreadPoolMXBean.class);
int activeThreadCount = mxbean.getActiveThreadCount();

16. Using JMX Instrumentation for Memory Pool Monitoring

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.MEMORY_POOL_MXBEAN_DOMAIN_TYPE + ",name=CodeHeap");
MemoryPoolMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, MemoryPoolMXBean.class);
long usage = mxbean.getUsage().getUsed();

17. Using JMX Instrumentation for Garbage Collector Monitoring

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE + ",name=ParNew");
GarbageCollectorMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, GarbageCollectorMXBean.class);
long collectionCount = mxbean.getCollectionCount();

18. Using JMX Instrumentation for Class Loading Monitoring

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.CLASS_LOADING_MXBEAN_DOMAIN_TYPE);
ClassLoadingMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, ClassLoadingMXBean.class);
int loadedClassCount = mxbean.getLoadedClassCount();

19. Using JMX Instrumentation for Compilation Monitoring

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.COMPILATION_MXBEAN_DOMAIN_TYPE);
CompilationMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, CompilationMXBean.class);
long totalCompileTime = mxbean.getTotalCompileTime();

20. Using JMX Instrumentation for Operating System Monitoring

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.OPERATING_SYSTEM_MXBEAN_DOMAIN_TYPE);
OperatingSystemMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, OperatingSystemMXBean.class);
int availableProcessors = mxbean.getAvailableProcessors();

21. Using JMX Instrumentation for Runtime Monitoring

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.RUNTIME_MXBEAN_DOMAIN_TYPE);
RuntimeMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, RuntimeMXBean.class);
long uptime = mxbean.getUptime();

22. Using JMX Instrumentation for Thread Pool Monitoring

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.THREAD_POOL_MXBEAN_DOMAIN_TYPE + ",name=default");
ThreadPoolMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, ThreadPoolMXBean.class);
int activeThreadCount = mxbean.getActiveThreadCount();

23. Using JMX Instrumentation for Memory Management

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.MEMORY_MANAGER_MXBEAN_DOMAIN_TYPE);
MemoryManagerMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, MemoryManagerMXBean.class);
long memoryUsage = mxbean.getMemoryUsage();

24. Using JMX Instrumentation for Garbage Collection

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE + ",name=ParNew");
GarbageCollectorMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, GarbageCollectorMXBean.class);
long collectionCount = mxbean.getCollectionCount();

25. Using JMX Instrumentation for Class Loading

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.CLASS_LOADING_MXBEAN_DOMAIN_TYPE);
ClassLoadingMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, ClassLoadingMXBean.class);
int loadedClassCount = mxbean.getLoadedClassCount();

26. Using JMX Instrumentation for Compilation

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.COMPILATION_MXBEAN_DOMAIN_TYPE);
CompilationMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, CompilationMXBean.class);
long totalCompileTime = mxbean.getTotalCompileTime();

27. Using JMX Instrumentation for Operating System

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.OPERATING_SYSTEM_MXBEAN_DOMAIN_TYPE);
OperatingSystemMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, OperatingSystemMXBean.class);
int availableProcessors = mxbean.getAvailableProcessors();

28. Using JMX Instrumentation for Runtime

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.RUNTIME_MXBEAN_DOMAIN_TYPE);
RuntimeMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, RuntimeMXBean.class);
long uptime = mxbean.getUptime();

29. Using JMX Instrumentation for Thread Pool

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.THREAD_POOL_MXBEAN_DOMAIN_TYPE + ",name=default");
ThreadPoolMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, ThreadPoolMXBean.class);
int activeThreadCount = mxbean.getActiveThreadCount();

30. Using JMX Instrumentation for Memory Management

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.MEMORY_MANAGER_MXBEAN_DOMAIN_TYPE);
MemoryManagerMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, MemoryManagerMXBean.class);
long memoryUsage = mxbean.getMemoryUsage();

31. Using JMX Instrumentation for Garbage Collection

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE + ",name=ParNew");
GarbageCollectorMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, GarbageCollectorMXBean.class);
long collectionCount = mxbean.getCollectionCount();

32. Using JMX Instrumentation for Class Loading

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.CLASS_LOADING_MXBEAN_DOMAIN_TYPE);
ClassLoadingMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, ClassLoadingMXBean.class);
int loadedClassCount = mxbean.getLoadedClassCount();

33. Using JMX Instrumentation for Compilation

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.COMPILATION_MXBEAN_DOMAIN_TYPE);
CompilationMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, CompilationMXBean.class);
long totalCompileTime = mxbean.getTotalCompileTime();

34. Using JMX Instrumentation for Operating System

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.OPERATING_SYSTEM_MXBEAN_DOMAIN_TYPE);
OperatingSystemMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, OperatingSystemMXBean.class);
int availableProcessors = mxbean.getAvailableProcessors();

35. Using JMX Instrumentation for Runtime

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.RUNTIME_MXBEAN_DOMAIN_TYPE);
RuntimeMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, RuntimeMXBean.class);
long uptime = mxbean.getUptime();

36. Using JMX Instrumentation for Thread Pool

MBeanServer mbeanServer = MBeanServerFactory.createMBeanServer();
ObjectName objectName = new ObjectName(ManagementFactory.THREAD_POOL_MXBEAN_DOMAIN_TYPE + ",name=default");
ThreadPoolMXBean mxbean = ManagementFactory.newPlatformMXBeanProxy(mbeanServer, objectName, ThreadPoolMXBean.class);
int activeThreadCount = mxbean.getActiveThreadCount();