Module java.management

Package java.lang.management

Class ManagementFactory

java.lang.Object

java.lang.management.ManagementFactory

public class ManagementFactory
extends Object

The ManagementFactory class is a factory class for getting managed beans for the Java platform. This class consists of static methods each of which returns one or more platform MXBeans representing the management interface of a component of the Java virtual machine.

Platform MXBeans

A platform MXBean is a managed bean that conforms to the JMX Instrumentation Specification and only uses a set of basic data types. A JMX management application and the platform MBeanServer can interoperate without requiring classes for MXBean specific data types. The data types being transmitted between the JMX connector server and the connector client are open types and this allows interoperation across versions. See the specification of MXBeans for details.

Each platform MXBean is a PlatformManagedObject and it has a unique ObjectName for registration in the platform MBeanServer as returned by by the getObjectName method.

An application can access a platform MXBean in the following ways:

1. Direct access to an MXBean interface

• Get an MXBean instance by calling the getPlatformMXBean or getPlatformMXBeans method and access the MXBean locally in the running virtual machine.
• Construct an MXBean proxy instance that forwards the method calls to a given MBeanServer by calling the getPlatformMXBean(MBeanServerConnection, Class) or getPlatformMXBeans(MBeanServerConnection, Class) method. The newPlatformMXBeanProxy method can also be used to construct an MXBean proxy instance of a given ObjectName. A proxy is typically constructed to remotely access an MXBean of another running virtual machine.

2. Indirect access to an MXBean interface via MBeanServer

• Go through the platform MBeanServer to access MXBeans locally or a specific MBeanServerConnection to access MXBeans remotely. The attributes and operations of an MXBean use only JMX open types which include basic data types, CompositeData, and TabularData defined in OpenType. The mapping is specified in the MXBean specification for details.

The getPlatformManagementInterfaces method returns all management interfaces supported in the Java virtual machine including the standard management interfaces listed in the tables below as well as the management interfaces extended by the JDK implementation.

A Java virtual machine has a single instance of the following management interfaces:

The list of Management Interfaces and their single instances

Management Interface	ObjectName
ClassLoadingMXBean	java.lang:type=ClassLoading
MemoryMXBean	java.lang:type=Memory
ThreadMXBean	java.lang:type=Threading
RuntimeMXBean	java.lang:type=Runtime
OperatingSystemMXBean	java.lang:type=OperatingSystem
PlatformLoggingMXBean	java.util.logging:type=Logging

A Java virtual machine has zero or a single instance of the following management interfaces.

The list of Management Interfaces and their single instances

Management Interface	ObjectName
CompilationMXBean	java.lang:type=Compilation

A Java virtual machine may have one or more instances of the following management interfaces.

The list of Management Interfaces and their single instances

Management Interface	ObjectName
GarbageCollectorMXBean	java.lang:type=GarbageCollector,name=collector's name
MemoryManagerMXBean	java.lang:type=MemoryManager,name=manager's name
MemoryPoolMXBean	java.lang:type=MemoryPool,name=pool's name
BufferPoolMXBean	java.nio:type=BufferPool,name=pool name

Since:

1.5

See Also:

• JMX Specification
• Ways to Access Management Metrics
• MXBean

Field Summary

Fields

Modifier and Type	Field	Description
static final String	CLASS_LOADING_MXBEAN_NAME	String representation of the ObjectName for the ClassLoadingMXBean.
static final String	COMPILATION_MXBEAN_NAME	String representation of the ObjectName for the CompilationMXBean.
static final String	GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE	The domain name and the type key property in the ObjectName for a GarbageCollectorMXBean.
static final String	MEMORY_MANAGER_MXBEAN_DOMAIN_TYPE	The domain name and the type key property in the ObjectName for a MemoryManagerMXBean.
static final String	MEMORY_MXBEAN_NAME	String representation of the ObjectName for the MemoryMXBean.
static final String	MEMORY_POOL_MXBEAN_DOMAIN_TYPE	The domain name and the type key property in the ObjectName for a MemoryPoolMXBean.
static final String	OPERATING_SYSTEM_MXBEAN_NAME	String representation of the ObjectName for the OperatingSystemMXBean.
static final String	RUNTIME_MXBEAN_NAME	String representation of the ObjectName for the RuntimeMXBean.
static final String	THREAD_MXBEAN_NAME	String representation of the ObjectName for the ThreadMXBean.

Method Summary

Modifier and Type	Method	Description
static ClassLoadingMXBean	getClassLoadingMXBean()	Returns the managed bean for the class loading system of the Java virtual machine.
static CompilationMXBean	getCompilationMXBean()	Returns the managed bean for the compilation system of the Java virtual machine.
static List<GarbageCollectorMXBean>	getGarbageCollectorMXBeans()	Returns a list of GarbageCollectorMXBean objects in the Java virtual machine.
static List<MemoryManagerMXBean>	getMemoryManagerMXBeans()	Returns a list of MemoryManagerMXBean objects in the Java virtual machine.
static MemoryMXBean	getMemoryMXBean()	Returns the managed bean for the memory system of the Java virtual machine.
static List<MemoryPoolMXBean>	getMemoryPoolMXBeans()	Returns a list of MemoryPoolMXBean objects in the Java virtual machine.
static OperatingSystemMXBean	getOperatingSystemMXBean()	Returns the managed bean for the operating system on which the Java virtual machine is running.
static Set<Class<? extends PlatformManagedObject>>	getPlatformManagementInterfaces()	Returns the set of Class objects, subinterface of PlatformManagedObject, representing all management interfaces for monitoring and managing the Java platform.
static MBeanServer	getPlatformMBeanServer()	Returns the platform MBeanServer.
static <T extends PlatformManagedObject> T	getPlatformMXBean(Class<T> mxbeanInterface)	Returns the platform MXBean implementing the given mxbeanInterface which is specified to have one single instance in the Java virtual machine.
static <T extends PlatformManagedObject> T	getPlatformMXBean(MBeanServerConnection connection, Class<T> mxbeanInterface)	Returns the platform MXBean proxy for mxbeanInterface which is specified to have one single instance in a Java virtual machine and the proxy will forward the method calls through the given MBeanServerConnection.
static <T extends PlatformManagedObject> List<T>	getPlatformMXBeans(Class<T> mxbeanInterface)	Returns the list of platform MXBeans implementing the given mxbeanInterface in the Java virtual machine.
static <T extends PlatformManagedObject> List<T>	getPlatformMXBeans(MBeanServerConnection connection, Class<T> mxbeanInterface)	Returns the list of the platform MXBean proxies for forwarding the method calls of the mxbeanInterface through the given MBeanServerConnection.
static RuntimeMXBean	getRuntimeMXBean()	Returns the managed bean for the runtime system of the Java virtual machine.
static ThreadMXBean	getThreadMXBean()	Returns the managed bean for the thread system of the Java virtual machine.
static <T> T	newPlatformMXBeanProxy(MBeanServerConnection connection, String mxbeanName, Class<T> mxbeanInterface)	Returns a proxy for a platform MXBean interface of a given MXBean name that forwards its method calls through the given MBeanServerConnection.

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

CLASS_LOADING_MXBEAN_NAME

public static final String CLASS_LOADING_MXBEAN_NAME

String representation of the ObjectName for the ClassLoadingMXBean.

See Also:

• Constant Field Values

COMPILATION_MXBEAN_NAME

public static final String COMPILATION_MXBEAN_NAME

String representation of the ObjectName for the CompilationMXBean.

See Also:

• Constant Field Values

MEMORY_MXBEAN_NAME

public static final String MEMORY_MXBEAN_NAME

String representation of the ObjectName for the MemoryMXBean.

See Also:

• Constant Field Values

OPERATING_SYSTEM_MXBEAN_NAME

public static final String OPERATING_SYSTEM_MXBEAN_NAME

String representation of the ObjectName for the OperatingSystemMXBean.

See Also:

• Constant Field Values

RUNTIME_MXBEAN_NAME

public static final String RUNTIME_MXBEAN_NAME

String representation of the ObjectName for the RuntimeMXBean.

See Also:

• Constant Field Values

THREAD_MXBEAN_NAME

public static final String THREAD_MXBEAN_NAME

String representation of the ObjectName for the ThreadMXBean.

See Also:

• Constant Field Values

GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE

public static final String GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE

The domain name and the type key property in the ObjectName for a GarbageCollectorMXBean. The unique ObjectName for a GarbageCollectorMXBean can be formed by appending this string with ",name=collector's name".

See Also:

• Constant Field Values

MEMORY_MANAGER_MXBEAN_DOMAIN_TYPE

public static final String MEMORY_MANAGER_MXBEAN_DOMAIN_TYPE

The domain name and the type key property in the ObjectName for a MemoryManagerMXBean. The unique ObjectName for a MemoryManagerMXBean can be formed by appending this string with ",name=manager's name".

See Also:

• Constant Field Values

MEMORY_POOL_MXBEAN_DOMAIN_TYPE

public static final String MEMORY_POOL_MXBEAN_DOMAIN_TYPE

The domain name and the type key property in the ObjectName for a MemoryPoolMXBean. The unique ObjectName for a MemoryPoolMXBean can be formed by appending this string with ,name=pool's name.

See Also:

• Constant Field Values

Method Details

getClassLoadingMXBean

public static ClassLoadingMXBean getClassLoadingMXBean()

Returns the managed bean for the class loading system of the Java virtual machine.

Returns:

a ClassLoadingMXBean object for the Java virtual machine.

getMemoryMXBean

public static MemoryMXBean getMemoryMXBean()

Returns the managed bean for the memory system of the Java virtual machine.

Returns:

a MemoryMXBean object for the Java virtual machine.

getThreadMXBean

public static ThreadMXBean getThreadMXBean()

Returns the managed bean for the thread system of the Java virtual machine.

Returns:

a ThreadMXBean object for the Java virtual machine.

getRuntimeMXBean

public static RuntimeMXBean getRuntimeMXBean()

Returns the managed bean for the runtime system of the Java virtual machine.

Returns:

a RuntimeMXBean object for the Java virtual machine.

getCompilationMXBean

public static CompilationMXBean getCompilationMXBean()

Returns the managed bean for the compilation system of the Java virtual machine. This method returns null if the Java virtual machine has no compilation system.

Returns:

a CompilationMXBean object for the Java virtual machine or null if the Java virtual machine has no compilation system.

getOperatingSystemMXBean

public static OperatingSystemMXBean getOperatingSystemMXBean()

Returns the managed bean for the operating system on which the Java virtual machine is running.

Returns:

an OperatingSystemMXBean object for the Java virtual machine.

getMemoryPoolMXBeans

public static List<MemoryPoolMXBean> getMemoryPoolMXBeans()

Returns a list of MemoryPoolMXBean objects in the Java virtual machine. The Java virtual machine can have one or more memory pools. It may add or remove memory pools during execution.

Returns:

a list of MemoryPoolMXBean objects.

getMemoryManagerMXBeans

public static List<MemoryManagerMXBean> getMemoryManagerMXBeans()

Returns a list of MemoryManagerMXBean objects in the Java virtual machine. The Java virtual machine can have one or more memory managers. It may add or remove memory managers during execution.

Returns:

a list of MemoryManagerMXBean objects.

getGarbageCollectorMXBeans

public static List<GarbageCollectorMXBean> getGarbageCollectorMXBeans()

Returns a list of GarbageCollectorMXBean objects in the Java virtual machine. The Java virtual machine may have one or more GarbageCollectorMXBean objects. It may add or remove GarbageCollectorMXBean during execution.

Returns:

a list of GarbageCollectorMXBean objects.

getPlatformMBeanServer

public static MBeanServer getPlatformMBeanServer()

Returns the platform MBeanServer. On the first call to this method, it first creates the platform MBeanServer by calling the MBeanServerFactory.createMBeanServer method and registers each platform MXBean in this platform MBeanServer with its ObjectName. This method, in subsequent calls, will simply return the initially created platform MBeanServer.

MXBeans that get created and destroyed dynamically, for example, memory pools and managers, will automatically be registered and deregistered into the platform MBeanServer.

If the system property javax.management.builder.initial is set, the platform MBeanServer creation will be done by the specified MBeanServerBuilder.

It is recommended that this platform MBeanServer also be used to register other application managed beans besides the platform MXBeans. This will allow all MBeans to be published through the same MBeanServer and hence allow for easier network publishing and discovery. Name conflicts with the platform MXBeans should be avoided.

Returns:

the platform MBeanServer; the platform MXBeans are registered into the platform MBeanServer at the first time this method is called.

Throws:

SecurityException - if there is a security manager and the caller does not have the permission required by MBeanServerFactory.createMBeanServer().

See Also:

• MBeanServerFactory
• MBeanServerFactory.createMBeanServer()

newPlatformMXBeanProxy

public static <T> T newPlatformMXBeanProxy(MBeanServerConnection connection,
 String mxbeanName,
 Class<T> mxbeanInterface)
                                    throws IOException

Returns a proxy for a platform MXBean interface of a given MXBean name that forwards its method calls through the given MBeanServerConnection.

This method is equivalent to:

Proxy.newProxyInstance(mxbeanInterface.getClassLoader(), new Class[] { mxbeanInterface }, handler)

where handler is an InvocationHandler to which method invocations to the MXBean interface are dispatched. This handler converts an input parameter from an MXBean data type to its mapped open type before forwarding to the MBeanServer and converts a return value from an MXBean method call through the MBeanServer from an open type to the corresponding return type declared in the MXBean interface.

If the MXBean is a notification emitter (i.e., it implements NotificationEmitter), both the mxbeanInterface and NotificationEmitter will be implemented by this proxy.

Notes:

1. Using an MXBean proxy is a convenience remote access to a platform MXBean of a running virtual machine. All method calls to the MXBean proxy are forwarded to an MBeanServerConnection where IOException may be thrown when the communication problem occurs with the connector server. If thrown, IOException will be wrappped in UndeclaredThrowableException. An application remotely accessing the platform MXBeans using proxy should prepare to catch UndeclaredThrowableException and handle its cause as if that cause had been thrown by the MBeanServerConnection interface.
2. When a client application is designed to remotely access MXBeans for a running virtual machine whose version is different than the version on which the application is running, it should prepare to catch InvalidObjectException which is thrown when an MXBean proxy receives a name of an enum constant which is missing in the enum class loaded in the client application. If thrown, InvalidObjectException will be wrappped in UndeclaredThrowableException.
3. MBeanServerInvocationHandler or its newProxyInstance method cannot be used to create a proxy for a platform MXBean. The proxy object created by MBeanServerInvocationHandler does not handle the properties of the platform MXBeans described in the class specification.

Type Parameters:

T - an mxbeanInterface type parameter

Parameters:

connection - the MBeanServerConnection to forward to.

mxbeanName - the name of a platform MXBean within connection to forward to. mxbeanName must be in the format of ObjectName.

mxbeanInterface - the MXBean interface to be implemented by the proxy.

Returns:

a proxy for a platform MXBean interface of a given MXBean name that forwards its method calls through the given MBeanServerConnection, or null if not exist.

Throws:

IllegalArgumentException - if

• mxbeanName is not with a valid ObjectName format, or
• the named MXBean in the connection is not a MXBean provided by the platform, or
• the named MXBean is not registered in the MBeanServerConnection, or
• the named MXBean is not an instance of the given mxbeanInterface

IOException - if a communication problem occurred when accessing the MBeanServerConnection.

getPlatformMXBean

public static <T extends PlatformManagedObject> T getPlatformMXBean(Class<T> mxbeanInterface)

Returns the platform MXBean implementing the given mxbeanInterface which is specified to have one single instance in the Java virtual machine. This method may return null if the management interface is not implemented in the Java virtual machine (for example, a Java virtual machine with no compilation system does not implement CompilationMXBean); otherwise, this method is equivalent to calling:

    getPlatformMXBeans(mxbeanInterface).get(0);
 

Type Parameters:

T - an mxbeanInterface type parameter

Parameters:

mxbeanInterface - a management interface for a platform MXBean with one single instance in the Java virtual machine if implemented.

Returns:

the platform MXBean that implements mxbeanInterface, or null if not exist.

Throws:

IllegalArgumentException - if mxbeanInterface is not a platform management interface or not a singleton platform MXBean.

Since:

1.7

getPlatformMXBeans

public static <T extends PlatformManagedObject>
List<T> getPlatformMXBeans(Class<T> mxbeanInterface)

Returns the list of platform MXBeans implementing the given mxbeanInterface in the Java virtual machine. The returned list may contain zero, one, or more instances. The number of instances in the returned list is defined in the specification of the given management interface. The order is undefined and there is no guarantee that the list returned is in the same order as previous invocations.

Type Parameters:

T - an mxbeanInterface type parameter

Parameters:

mxbeanInterface - a management interface for a platform MXBean

Returns:

the list of platform MXBeans that implement mxbeanInterface.

Throws:

IllegalArgumentException - if mxbeanInterface is not a platform management interface.

Since:

1.7

getPlatformMXBean

public static <T extends PlatformManagedObject> T getPlatformMXBean(MBeanServerConnection connection,
 Class<T> mxbeanInterface)
                                                             throws IOException

Returns the platform MXBean proxy for mxbeanInterface which is specified to have one single instance in a Java virtual machine and the proxy will forward the method calls through the given MBeanServerConnection. This method may return null if the management interface is not implemented in the Java virtual machine being monitored (for example, a Java virtual machine with no compilation system does not implement CompilationMXBean); otherwise, this method is equivalent to calling:

     getPlatformMXBeans(connection, mxbeanInterface).get(0);
 

Type Parameters:

T - an mxbeanInterface type parameter

Parameters:

connection - the MBeanServerConnection to forward to.

mxbeanInterface - a management interface for a platform MXBean with one single instance in the Java virtual machine being monitored, if implemented.

Returns:

the platform MXBean proxy for forwarding the method calls of the mxbeanInterface through the given MBeanServerConnection, or null if not exist.

Throws:

IllegalArgumentException - if mxbeanInterface is not a platform management interface or not a singleton platform MXBean.

IOException - if a communication problem occurred when accessing the MBeanServerConnection.

Since:

1.7

See Also:

• newPlatformMXBeanProxy(javax.management.MBeanServerConnection, java.lang.String, java.lang.Class<T>)

getPlatformMXBeans

public static <T extends PlatformManagedObject>
List<T> getPlatformMXBeans(MBeanServerConnection connection,
 Class<T> mxbeanInterface)
                    throws IOException

Returns the list of the platform MXBean proxies for forwarding the method calls of the mxbeanInterface through the given MBeanServerConnection. The returned list may contain zero, one, or more instances. The number of instances in the returned list is defined in the specification of the given management interface. The order is undefined and there is no guarantee that the list returned is in the same order as previous invocations.

Type Parameters:

T - an mxbeanInterface type parameter

Parameters:

connection - the MBeanServerConnection to forward to.

mxbeanInterface - a management interface for a platform MXBean

Returns:

the list of platform MXBean proxies for forwarding the method calls of the mxbeanInterface through the given MBeanServerConnection.

Throws:

IllegalArgumentException - if mxbeanInterface is not a platform management interface.

IOException - if a communication problem occurred when accessing the MBeanServerConnection.

Since:

1.7

See Also:

• newPlatformMXBeanProxy(javax.management.MBeanServerConnection, java.lang.String, java.lang.Class<T>)

getPlatformManagementInterfaces

public static Set<Class<? extends PlatformManagedObject>> getPlatformManagementInterfaces()

Returns the set of Class objects, subinterface of PlatformManagedObject, representing all management interfaces for monitoring and managing the Java platform.

Returns:

the set of Class objects, subinterface of PlatformManagedObject representing the management interfaces for monitoring and managing the Java platform.

Since:

1.7