javax.management.MBeanInfo Java Examples

/**
 * Queries for all MBeans from the MBean Server and only looks at the relevant MBean and gets its
 * metric numbers.
 */
private void extractMetrics() {
  try {
    QueryExp exp = Query.match(Query.attr("SensorName"), Query.value(CLUSTER_NAME + ".Job.*"));
    Set<ObjectInstance> mbeans = new HashSet<>(
        ManagementFactory.getPlatformMBeanServer().queryMBeans(new ObjectName("ClusterStatus:*"), exp));
    for (ObjectInstance instance : mbeans) {
      ObjectName beanName = instance.getObjectName();
      if (instance.getClassName().endsWith("JobMonitor")) {
        MBeanInfo info = _server.getMBeanInfo(beanName);
        MBeanAttributeInfo[] infos = info.getAttributes();
        for (MBeanAttributeInfo infoItem : infos) {
          Object val = _server.getAttribute(beanName, infoItem.getName());
          _beanValueMap.put(infoItem.getName(), val);
        }
      }
    }
  } catch (Exception e) {
    // update failed
  }
}
 

public MBeanInfo getMBeanInfo(ObjectName name)
throws InstanceNotFoundException,
        IntrospectionException,
        ReflectionException,
        IOException {

    if (logger.debugOn()) logger.debug("getMBeanInfo", "name=" + name);
    final ClassLoader old = pushDefaultClassLoader();
    try {
        return connection.getMBeanInfo(name, delegationSubject);
    } catch (IOException ioe) {
        communicatorAdmin.gotIOException(ioe);

        return connection.getMBeanInfo(name, delegationSubject);
    } finally {
        popDefaultClassLoader(old);
    }
}
 

private void listMetaData(CommandProcess process) {
    Set<ObjectName> objectNames = queryObjectNames();
    MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
    try {
        TableElement table = createTable();
        for (ObjectName objectName : objectNames) {
            MBeanInfo mBeanInfo = mBeanServer.getMBeanInfo(objectName);
            drawMetaInfo(mBeanInfo, objectName, table);
            drawAttributeInfo(mBeanInfo.getAttributes(), table);
            drawOperationInfo(mBeanInfo.getOperations(), table);
            drawNotificationInfo(mBeanInfo.getNotifications(), table);
        }
        process.write(RenderUtil.render(table, process.width()));
    } catch (Throwable e) {
        logger.warn("listMetaData error", e);
    } finally {
        process.end();
    }
}
 

private static boolean test(Object mbean, boolean expectImmutable)
        throws Exception {
    MBeanServer mbs = MBeanServerFactory.newMBeanServer();
    ObjectName on = new ObjectName("a:b=c");
    mbs.registerMBean(mbean, on);
    MBeanInfo mbi = mbs.getMBeanInfo(on);
    Descriptor d = mbi.getDescriptor();
    String immutableValue = (String) d.getFieldValue("immutableInfo");
    boolean immutable = ("true".equals(immutableValue));
    if (immutable != expectImmutable) {
        System.out.println("FAILED: " + mbean.getClass().getName() +
                " -> " + immutableValue);
        return false;
    } else {
        System.out.println("OK: " + mbean.getClass().getName());
        return true;
    }
}
 

public static void main(String[] args) throws Exception {
    // Instantiate the MBean server
    //
    final MBeanAttributeInfo[]    atts   = makeAttInfos(attributes);
    final MBeanConstructorInfo[]  ctors  = makeCtorInfos(constructors);
    final MBeanOperationInfo[]    ops    = makeOpInfos(operations);
    final MBeanNotificationInfo[] notifs =
        makeNotifInfos(notificationclasses);

    for (int i=0; i<mbeanclasses.length;i++) {
        System.out.println("Create an MBeanInfo: " + mbeanclasses[i][0]);
        final MBeanInfo mbi =
            new MBeanInfo(mbeanclasses[i][1],mbeanclasses[i][0],
                          atts, ctors, ops, notifs);
    }

    // Test OK!
    //
    System.out.println("All MBeanInfo successfuly created!");
    System.out.println("Bye! Bye!");
}
 

/**
 * Invoke an operation
 * @param name The bean name
 * @param index The method index
 * @param args The arguments
 * @return The result
 * @exception JMException Thrown if an error occurs
 */
public static OpResultInfo invokeOp(String name, int index, String[] args) throws JMException
{
   MBeanServer server = getMBeanServer();
   ObjectName objName = new ObjectName(name);
   MBeanInfo info = server.getMBeanInfo(objName);
   MBeanOperationInfo[] opInfo = info.getOperations();
   MBeanOperationInfo op = opInfo[index];
   MBeanParameterInfo[] paramInfo = op.getSignature();
   String[] argTypes = new String[paramInfo.length];

   for (int p = 0; p < paramInfo.length; p++)
      argTypes[p] = paramInfo[p].getType();
 
   return invokeOpByName(name, op.getName(), argTypes, args);
}
 

/**
 * Gets the attribute name value map.
 * 
 * @param objName
 *            the obj name
 * @return the attribute name value map
 */
public Map<String, Object> getAttributes(ObjectName objName) {
	Map<String, Object> attrMap = null;
	try {
		MBeanInfo mbeanInfo = mbeanServerConnection.getMBeanInfo(objName);
		MBeanAttributeInfo[] mbeanAttributeInfo = mbeanInfo.getAttributes();
		attrMap = new HashMap<String, Object>();
		DecimalFormat df = new DecimalFormat("###.##");
		for (int i = 0; i < mbeanAttributeInfo.length; i++) {
			String attrName = mbeanAttributeInfo[i].getName();
			Object attrValue = getAttribute(objName,
					mbeanAttributeInfo[i].getName());
			if (mbeanAttributeInfo[i].getType().equals("double")) {
				attrValue = df.format((Double) getAttribute(objName,
						mbeanAttributeInfo[i].getName()));
			}
			attrMap.put(attrName, attrValue);
		}
	} catch (Exception e) {
		LOGGER.error(e.getMessage(), e);
	}
	return attrMap;
}
 

private ModelNode getInfo(ObjectName objectName) {
    MBeanServerConnection connection = getConnection();
    ModelNode attributes = null;
    ModelNode headers = null;
    Exception exception = null;
    try {
        MBeanInfo mBeanInfo = connection.getMBeanInfo(objectName);
        MBeanAttributeInfo[] attributeInfos = mBeanInfo.getAttributes();
        ModelNode[] data = modelNodeAttributesInfo(attributeInfos, objectName);
        attributes = data[0];
        headers = data[1];
    } catch (Exception e) {
        if (e instanceof JMException || e instanceof JMRuntimeException) {
            exception = e;
        } else {
            throw new RuntimeException(e);
        }
    }
    return modelNodeResult(attributes, exception, headers);
}
 

private void registerAndVerifyMBean(MBeanServer mbs) {
    try {
        ObjectName myInfoObj = new ObjectName("com.alibaba.tenant.mxbean:type=MyTest");
        MXBeanImpl myMXBean = new MXBeanImpl();
        StandardMBean smb = new StandardMBean(myMXBean, MXBean.class);
        mbs.registerMBean(smb, myInfoObj);

        assertTrue(mbs.isRegistered(myInfoObj));

        //call the method of MXBean
        MXBean mbean =
                (MXBean)MBeanServerInvocationHandler.newProxyInstance(
                     mbs,new ObjectName("com.alibaba.tenant.mxbean:type=MyTest"), MXBean.class, true);
        assertTrue("test".equals(mbean.getName()));

        Set<ObjectInstance> instances = mbs.queryMBeans(new ObjectName("com.alibaba.tenant.mxbean:type=MyTest"), null);
        ObjectInstance instance = (ObjectInstance) instances.toArray()[0];
        assertTrue(myMXBean.getClass().getName().equals(instance.getClassName()));

        MBeanInfo info = mbs.getMBeanInfo(myInfoObj);
        assertTrue(myMXBean.getClass().getName().equals(info.getClassName()));
    } catch (Exception e) {
        e.printStackTrace();
        fail();
    }
}
 

final PerInterface<M> getPerInterface(Class<?> mbeanInterface)
throws NotCompliantMBeanException {
    PerInterfaceMap<M> map = getPerInterfaceMap();
    synchronized (map) {
        WeakReference<PerInterface<M>> wr = map.get(mbeanInterface);
        PerInterface<M> pi = (wr == null) ? null : wr.get();
        if (pi == null) {
            try {
                MBeanAnalyzer<M> analyzer = getAnalyzer(mbeanInterface);
                MBeanInfo mbeanInfo =
                        makeInterfaceMBeanInfo(mbeanInterface, analyzer);
                pi = new PerInterface<M>(mbeanInterface, this, analyzer,
                        mbeanInfo);
                wr = new WeakReference<PerInterface<M>>(pi);
                map.put(mbeanInterface, wr);
            } catch (Exception x) {
                throw Introspector.throwException(mbeanInterface,x);
            }
        }
        return pi;
    }
}
 

public static void main(String[] args) throws Exception {
    // Instantiate the MBean server
    //
    final MBeanAttributeInfo[]    atts   = makeAttInfos(attributes);
    final MBeanConstructorInfo[]  ctors  = makeCtorInfos(constructors);
    final MBeanOperationInfo[]    ops    = makeOpInfos(operations);
    final MBeanNotificationInfo[] notifs =
        makeNotifInfos(notificationclasses);

    for (int i=0; i<mbeanclasses.length;i++) {
        System.out.println("Create an MBeanInfo: " + mbeanclasses[i][0]);
        final MBeanInfo mbi =
            new MBeanInfo(mbeanclasses[i][1],mbeanclasses[i][0],
                          atts, ctors, ops, notifs);
    }

    // Test OK!
    //
    System.out.println("All MBeanInfo successfuly created!");
    System.out.println("Bye! Bye!");
}
 

private static boolean test(Object mbean, boolean expectImmutable)
        throws Exception {
    MBeanServer mbs = MBeanServerFactory.newMBeanServer();
    ObjectName on = new ObjectName("a:b=c");
    mbs.registerMBean(mbean, on);
    MBeanInfo mbi = mbs.getMBeanInfo(on);
    Descriptor d = mbi.getDescriptor();
    String immutableValue = (String) d.getFieldValue("immutableInfo");
    boolean immutable = ("true".equals(immutableValue));
    if (immutable != expectImmutable) {
        System.out.println("FAILED: " + mbean.getClass().getName() +
                " -> " + immutableValue);
        return false;
    } else {
        System.out.println("OK: " + mbean.getClass().getName());
        return true;
    }
}
 

private static void printAttrs(
        MBeanServerConnection mbsc1, Class<? extends Exception> expectX)
throws Exception {
    Set<ObjectName> names = mbsc1.queryNames(null, null);
    for (ObjectName name : names) {
        System.out.println(name + ":");
        MBeanInfo mbi = mbsc1.getMBeanInfo(name);
        MBeanAttributeInfo[] mbais = mbi.getAttributes();
        for (MBeanAttributeInfo mbai : mbais) {
            String attr = mbai.getName();
            Object value;
            try {
                value = mbsc1.getAttribute(name, attr);
            } catch (Exception e) {
                if (expectX != null && expectX.isInstance(e))
                    value = "<" + e + ">";
                else
                    throw e;
            }
            String s = "  " + attr + " = " + value;
            if (s.length() > 80)
                s = s.substring(0, 77) + "...";
            System.out.println(s);
        }
    }
}
 

private MBeanInfo testMBeanForDatasource() throws Exception {
    Map<String, String[]> env = new HashMap<>();
    String[] credentials = { "admin", "admin" };
    env.put(JMXConnector.CREDENTIALS, credentials);
    try {
        String url = "service:jmx:rmi://localhost:12311/jndi/rmi://localhost:11199/jmxrmi";
        JMXServiceURL jmxUrl = new JMXServiceURL(url);
        JMXConnector jmxConnector = JMXConnectorFactory.connect(jmxUrl, env);
        MBeanServerConnection mBeanServer = jmxConnector.getMBeanServerConnection();
        ObjectName mbeanObject = new ObjectName(dataSourceName + ",-1234:type=DataSource");
        MBeanInfo mBeanInfo = mBeanServer.getMBeanInfo(mbeanObject);
        return mBeanInfo;
    } catch (MalformedURLException | MalformedObjectNameException | IntrospectionException |
            ReflectionException e) {
        throw new AxisFault("Error while connecting to MBean Server " + e.getMessage(), e);
    }
}
 

/**
 * Return the MBeanInfo for the given resource, based on the given
 * per-interface data.
 */
final MBeanInfo getMBeanInfo(Object resource, PerInterface<M> perInterface) {
    MBeanInfo mbi =
            getClassMBeanInfo(resource.getClass(), perInterface);
    MBeanNotificationInfo[] notifs = findNotifications(resource);
    if (notifs == null || notifs.length == 0)
        return mbi;
    else {
        return new MBeanInfo(mbi.getClassName(),
                mbi.getDescription(),
                mbi.getAttributes(),
                mbi.getConstructors(),
                mbi.getOperations(),
                notifs,
                mbi.getDescriptor());
    }
}
 

@Override
public MBeanInfo getMBeanInfo() {
  MBeanAttributeInfo[] mbeanAttributes = new MBeanAttributeInfo[attributes.size()];
  int i = 0;
  for (Map.Entry<String, Object> entry : attributes.entrySet()) {
    String attrName = entry.getKey();
    Object attrValue = entry.getValue();
    String typeName = (attrValue instanceof Number)
        ? Number.class.getName()
        : String.class.getName();
    boolean isReadable = true;
    boolean isWritable = false;
    boolean isIs = false;
    mbeanAttributes[i++] = new MBeanAttributeInfo(
        attrName, typeName, "???", isReadable, isWritable, isIs);
  }
  return new MBeanInfo(getClass().getName(), "???", mbeanAttributes, null, null, null);
}
 

final PerInterface<M> getPerInterface(Class<?> mbeanInterface)
throws NotCompliantMBeanException {
    PerInterfaceMap<M> map = getPerInterfaceMap();
    synchronized (map) {
        WeakReference<PerInterface<M>> wr = map.get(mbeanInterface);
        PerInterface<M> pi = (wr == null) ? null : wr.get();
        if (pi == null) {
            try {
                MBeanAnalyzer<M> analyzer = getAnalyzer(mbeanInterface);
                MBeanInfo mbeanInfo =
                        makeInterfaceMBeanInfo(mbeanInterface, analyzer);
                pi = new PerInterface<M>(mbeanInterface, this, analyzer,
                        mbeanInfo);
                wr = new WeakReference<PerInterface<M>>(pi);
                map.put(mbeanInterface, wr);
            } catch (Exception x) {
                throw Introspector.throwException(mbeanInterface,x);
            }
        }
        return pi;
    }
}
 

final PerInterface<M> getPerInterface(Class<?> mbeanInterface)
throws NotCompliantMBeanException {
    PerInterfaceMap<M> map = getPerInterfaceMap();
    synchronized (map) {
        WeakReference<PerInterface<M>> wr = map.get(mbeanInterface);
        PerInterface<M> pi = (wr == null) ? null : wr.get();
        if (pi == null) {
            try {
                MBeanAnalyzer<M> analyzer = getAnalyzer(mbeanInterface);
                MBeanInfo mbeanInfo =
                        makeInterfaceMBeanInfo(mbeanInterface, analyzer);
                pi = new PerInterface<M>(mbeanInterface, this, analyzer,
                        mbeanInfo);
                wr = new WeakReference<PerInterface<M>>(pi);
                map.put(mbeanInterface, wr);
            } catch (Exception x) {
                throw Introspector.throwException(mbeanInterface,x);
            }
        }
        return pi;
    }
}
 

/**
 * Make the MBeanInfo skeleton for the given MBean interface using
 * the given analyzer.  This will never be the MBeanInfo of any real
 * MBean (because the getClassName() must be a concrete class), but
 * its MBeanAttributeInfo[] and MBeanOperationInfo[] can be inserted
 * into such an MBeanInfo, and its Descriptor can be the basis for
 * the MBeanInfo's Descriptor.
 */
private MBeanInfo makeInterfaceMBeanInfo(Class<?> mbeanInterface,
        MBeanAnalyzer<M> analyzer) {
    final MBeanInfoMaker maker = new MBeanInfoMaker();
    analyzer.visit(maker);
    final String description =
            "Information on the management interface of the MBean";
    return maker.makeMBeanInfo(mbeanInterface, description);
}
 

private final int doMemoryMXBeanTest(MBeanServerConnection mbsc) {
    int errorCount = 0 ;
    System.out.println("---- MemoryMXBean") ;

    try {
        ObjectName memoryName =
                new ObjectName(ManagementFactory.MEMORY_MXBEAN_NAME) ;
        MBeanInfo mbInfo = mbsc.getMBeanInfo(memoryName);
        errorCount += checkNonEmpty(mbInfo);
        System.out.println("getMBeanInfo\t\t"
                + mbInfo);
        MemoryMXBean memory = null ;

        memory =
                JMX.newMXBeanProxy(mbsc,
                memoryName,
                MemoryMXBean.class,
                true) ;
        System.out.println("getMemoryHeapUsage\t\t"
                + memory.getHeapMemoryUsage());
        System.out.println("getNonHeapMemoryHeapUsage\t\t"
                + memory.getNonHeapMemoryUsage());
        System.out.println("getObjectPendingFinalizationCount\t\t"
                + memory.getObjectPendingFinalizationCount());
        System.out.println("isVerbose\t\t"
                + memory.isVerbose());

        System.out.println("---- OK\n") ;

    } catch (Exception e) {
        Utils.printThrowable(e, true) ;
        errorCount++ ;
        System.out.println("---- ERROR\n") ;
    }

    return errorCount ;
}
 

/**
 * Make the MBeanInfo skeleton for the given MBean interface using
 * the given analyzer.  This will never be the MBeanInfo of any real
 * MBean (because the getClassName() must be a concrete class), but
 * its MBeanAttributeInfo[] and MBeanOperationInfo[] can be inserted
 * into such an MBeanInfo, and its Descriptor can be the basis for
 * the MBeanInfo's Descriptor.
 */
private MBeanInfo makeInterfaceMBeanInfo(Class<?> mbeanInterface,
        MBeanAnalyzer<M> analyzer) {
    final MBeanInfoMaker maker = new MBeanInfoMaker();
    analyzer.visit(maker);
    final String description =
            "Information on the management interface of the MBean";
    return maker.makeMBeanInfo(mbeanInterface, description);
}
 

public MBeanServerDelegateImpl () {
    super();
    delegateInfo =
        new MBeanInfo("javax.management.MBeanServerDelegate",
                      "Represents  the MBean server from the management "+
                      "point of view.",
                      MBeanServerDelegateImpl.attributeInfos, null,
                      null,getNotificationInfo());
}
 

private static void check(MBeanServer mbs, ObjectName on) throws Exception {
    MBeanInfo mbi = mbs.getMBeanInfo(on);

    // check the MBean itself
    check(mbi);

    // check attributes
    MBeanAttributeInfo[] attrs = mbi.getAttributes();
    for (MBeanAttributeInfo attr : attrs) {
        check(attr);
        if (attr.getName().equals("ReadOnly"))
            check("@Full", attr.getDescriptor(), expectedFullDescriptor);
    }

    // check operations
    MBeanOperationInfo[] ops = mbi.getOperations();
    for (MBeanOperationInfo op : ops) {
        check(op);
        check(op.getSignature());
    }

    MBeanConstructorInfo[] constrs = mbi.getConstructors();
    for (MBeanConstructorInfo constr : constrs) {
        check(constr);
        check(constr.getSignature());
    }
}
 

private MBeanInfo connectionLeaseMillisMBean() {
    try {
        ObjectName objectName = new ObjectName("com.vladmihalcea.flexypool.metric.dropwizard.JmxMetricReporter.unique-name:name=connectionLeaseMillis");
        return ManagementFactory.getPlatformMBeanServer().getMBeanInfo(objectName);
    } catch (Exception e) {
        throw new IllegalArgumentException(e);
    }
}
 

public MBeanInfo getMBeanInfo() {
    try {
        return new StandardMBean(new Except(), ExceptMBean.class)
            .getMBeanInfo();
    } catch (Exception e) {
        assert false;
        return null;
    }
}
 

private static void doExploit ( final Object payloadObject, MBeanServerConnection mbc )
        throws IOException, InstanceNotFoundException, IntrospectionException, ReflectionException {
    Object[] params = new Object[1];
    params[ 0 ] = payloadObject;
    System.err.println("Querying MBeans");
    Set<ObjectInstance> testMBeans = mbc.queryMBeans(null, null);
    System.err.println("Found " + testMBeans.size() + " MBeans");
    for ( ObjectInstance oi : testMBeans ) {
        MBeanInfo mBeanInfo = mbc.getMBeanInfo(oi.getObjectName());
        for ( MBeanOperationInfo opInfo : mBeanInfo.getOperations() ) {
            try {
                mbc.invoke(oi.getObjectName(), opInfo.getName(), params, new String[] {});
                System.err.println(oi.getObjectName() + ":" + opInfo.getName() + " -> SUCCESS");
                return;
            }
            catch ( Throwable e ) {
                String msg = e.getMessage();
                if ( msg.startsWith("java.lang.ClassNotFoundException:") ) {
                    int start = msg.indexOf('"');
                    int stop = msg.indexOf('"', start + 1);
                    String module = ( start >= 0 && stop > 0 ) ? msg.substring(start + 1, stop) : "<unknown>";
                    if ( !"<unknown>".equals(module) && !"org.jboss.as.jmx:main".equals(module) ) {
                        int cstart = msg.indexOf(':');
                        int cend = msg.indexOf(' ', cstart + 2);
                        String cls = msg.substring(cstart + 2, cend);
                        System.err.println(oi.getObjectName() + ":" + opInfo.getName() + " -> FAIL CNFE " + cls + " (" + module + ")");
                    }
                }
                else {
                    System.err.println(oi.getObjectName() + ":" + opInfo.getName() + " -> SUCCESS|ERROR " + msg);
                    return;
                }
            }
        }
    }
}
 

@Override
public MBeanInfo getMBeanInfo() {
	MBeanAttributeInfo attr = new MBeanAttributeInfo("name", "java.lang.String", "", true, false, false);
	return new MBeanInfo(
			TestDynamicMBean.class.getName(), "",
			new MBeanAttributeInfo[]{attr},
			new MBeanConstructorInfo[0],
			new MBeanOperationInfo[0],
			new MBeanNotificationInfo[0]);
}
 

private final int doOperatingSystemMXBeanTest(MBeanServerConnection mbsc) {
    int errorCount = 0 ;
    System.out.println("---- OperatingSystemMXBean") ;

    try {
        ObjectName operationName =
                new ObjectName(ManagementFactory.OPERATING_SYSTEM_MXBEAN_NAME) ;
        MBeanInfo mbInfo = mbsc.getMBeanInfo(operationName);
        errorCount += checkNonEmpty(mbInfo);
        System.out.println("getMBeanInfo\t\t" + mbInfo);
        OperatingSystemMXBean operation = null ;

        operation =
                JMX.newMXBeanProxy(mbsc,
                operationName,
                OperatingSystemMXBean.class) ;
        System.out.println("getArch\t\t"
                + operation.getArch());
        System.out.println("getAvailableProcessors\t\t"
                + operation.getAvailableProcessors());
        System.out.println("getName\t\t"
                + operation.getName());
        System.out.println("getVersion\t\t"
                + operation.getVersion());

        System.out.println("---- OK\n") ;
    } catch (Exception e) {
        Utils.printThrowable(e, true) ;
        errorCount++ ;
        System.out.println("---- ERROR\n") ;
    }

    return errorCount ;
}
 

public static void main(String[] args) throws Exception {
    System.out.println("--->JRCMD MBean Test: invocation on \"operation info\"...");

    MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    JMXServiceURL url = new JMXServiceURL("rmi", null, 0);
    JMXConnectorServer cs = null;
    JMXConnector cc = null;
    try {
        cs = JMXConnectorServerFactory.newJMXConnectorServer(url, null, mbs);
        cs.start();
        JMXServiceURL addr = cs.getAddress();
        cc = JMXConnectorFactory.connect(addr);
        MBeanServerConnection mbsc = cc.getMBeanServerConnection();
        ObjectName name = new ObjectName(HOTSPOT_DIAGNOSTIC_MXBEAN_NAME);
        MBeanInfo info = mbsc.getMBeanInfo(name);

        // the test should check that the MBean doesn't have any
        // Attribute, notification or constructor. Current version only
        // check operations
        System.out.println("Class Name:" + info.getClassName());
        System.out.println("Description:" + info.getDescription());
        MBeanOperationInfo[] opInfo = info.getOperations();
        System.out.println("Operations:");
        for (int i = 0; i < opInfo.length; i++) {
            printOperation(opInfo[i]);
            System.out.println("\n@@@@@@\n");
        }
    } finally {
        try {
            cc.close();
            cs.stop();
        } catch (Exception e) {
        }
    }

    System.out.println("Test passed");
}
 

private final int doGarbageCollectorMXBeanTest(MBeanServerConnection mbsc) {
    int errorCount = 0 ;
    System.out.println("---- GarbageCollectorMXBean") ;

    try {
        ObjectName filterName =
                new ObjectName(ManagementFactory.GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE
                + ",*");
        Set<ObjectName> onSet = mbsc.queryNames(filterName, null);

        for (Iterator<ObjectName> iter = onSet.iterator(); iter.hasNext(); ) {
            ObjectName garbageName = iter.next() ;
            System.out.println("-------- " + garbageName) ;
            MBeanInfo mbInfo = mbsc.getMBeanInfo(garbageName);
            errorCount += checkNonEmpty(mbInfo);
            System.out.println("getMBeanInfo\t\t" + mbInfo);
            GarbageCollectorMXBean garbage = null ;

            garbage =
                    JMX.newMXBeanProxy(mbsc,
                    garbageName,
                    GarbageCollectorMXBean.class) ;
            System.out.println("getCollectionCount\t\t"
                    + garbage.getCollectionCount());
            System.out.println("getCollectionTime\t\t"
                    + garbage.getCollectionTime());
        }

        System.out.println("---- OK\n") ;
    } catch (Exception e) {
        Utils.printThrowable(e, true) ;
        errorCount++ ;
        System.out.println("---- ERROR\n") ;
    }

    return errorCount ;
}