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JavaTM 2 Platform Standard Ed. 5.0 |
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See:
Description
Interface Summary | |
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ClassLoadingMXBean | The management interface for the class loading system of the Java virtual machine. |
CompilationMXBean | The management interface for the compilation system of the Java virtual machine. |
GarbageCollectorMXBean | The management interface for the garbage collection of the Java virtual machine. |
MemoryManagerMXBean | The management interface for a memory manager. |
MemoryMXBean | The management interface for the memory system of the Java virtual machine. |
MemoryPoolMXBean | The management interface for a memory pool. |
OperatingSystemMXBean | The management interface for the operating system on which the Java virtual machine is running. |
RuntimeMXBean | The management interface for the runtime system of the Java virtual machine. |
ThreadMXBean | The management interface for the thread system of the Java virtual machine. |
Class Summary | |
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ManagementFactory | The ManagementFactory class is a factory class for getting managed beans for the Java platform. |
ManagementPermission | The permission which the SecurityManager will check when code that is running with a SecurityManager calls methods defined in the management interface for the Java platform. |
MemoryNotificationInfo | The information about a memory notification. |
MemoryUsage | A MemoryUsage object represents a snapshot of memory usage. |
ThreadInfo | Thread information. |
Enum Summary | |
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MemoryType | Types of memory pools . |
Provides the management interface for monitoring and management of the Java virtual machine as well as the operating system on which the Java virtual machine is running. It allows both local and remote monitoring and management of the running Java virtual machine.
Management Interface
Description
ClassLoadingMXBean
Class loading system of the Java virtual machine. CompilationMXBean
Compilation system of the Java virtual machine. MemoryMXBean
Memory system of the Java virtual machine. ThreadMXBean
Threads system of the Java virtual machine. RuntimeMXBean
Runtime system of the Java virtual machine. OperatingSystemMXBean
Operating system on which the Java virtual machine is running. GarbageCollectorMXBean
Garbage collector in the Java virtual machine. MemoryManagerMXBean
Memory manager in the Java virtual machine. MemoryPoolMXBean
Memory pool in the Java virtual machine.
A platform MXBean is a managed bean that defines the management interface for one component for the platform and is specified in the ManagementFactory class.
An application can monitor the instrumentation of the Java virtual machine and manage certain characteristics in the following ways:
MBeanServer
by calling
ManagementFactory.newPlatformMXBeanProxy
.
A proxy is typically constructed to remotely access
an MXBean of another running virtual machine.MBeanServer
interface
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
.
ManagementFactory
class is the management
factory class for the Java platform. This class provides a set of
static factory methods to obtain the MXBeans for the Java platform
to allow an application to access the MXBeans directly.
A platform MBeanServer can be accessed with the
getPlatformMBeanServer
method. On the first call to this method,
it creates the platform MBeanServer and registers all platform MXBeans
including platform MXBeans defined in other packages such as
LoggingMXBean
.
Each platform MXBean is registered with a unique name defined in the
ManagementFactory
class
for constructing ObjectName
.
This is a single MBeanServer that can be shared by different managed
components running within the same Java virtual machine.
open types
and
this allows interoperation across versions.
A data type used by the MXBean interfaces are mapped to
an open type when being accessed via MBeanServer interface.
The data type mapping is specified in the
ManagementFactory
class.
RuntimeMXBean mxbean = ManagementFactory.getRuntimeMXBean(); // Get the standard attribute "VmVendor" String vendor = mxbean.getVmVendor();
MBeanServerConnection mbs; // Connect to a running JVM (or itself) and get MBeanServerConnection // that has the JVM MXBeans registered in it ... try { // Assuming the RuntimeMXBean has been registered in mbs ObjectName oname = new ObjectName(ManagementFactory.RUNTIME_MXBEAN_NAME); // Get standard attribute "VmVendor" String vendor = (String) mbs.getAttribute(oname, "VmVendor"); } catch (....) { // Catch the exceptions thrown by ObjectName constructor // and MBeanServer.getAttribute method ... }
MBeanServerConnection mbs; // Connect to a running JVM (or itself) and get MBeanServerConnection // that has the JVM MBeans registered in it ... // Get a MBean proxy for RuntimeMXBean interface RuntimeMXBean proxy = ManagementFactory.newPlatformMXBeanProxy(mbs, ManagementFactory.RUNTIME_MXBEAN_NAME, RuntimeMXBean.class); // Get standard attribute "VmVendor" String vendor = proxy.getVmVendor();
It is recommended to name the platform-specific attributes with a vendor-specific prefix such as the vendor's name to avoid collisions of the attribute name between the future extension to the standard management interface and the platform extension. If the future extension to the standard management interface defines a new attribute for a management interface and the attribute name is happened to be same as some vendor-specific attribute's name, the applications accessing that vendor-specific attribute would have to be modified to cope with versioning and compatibility issues.
Below is an example showing how to access a platform-specific attribute from Sun's implementation of the RuntimeMXBean.
1) Direct access to the Sun-specific MXBean interface
com.sun.management.RuntimeMXBean mxbean = (com.sun.management.RuntimeMXBean) ManagementFactory.getRuntimeMXBean(); // Get the standard attribute "VmVendor" String vendor = mxbean.getVmVendor(); // Get the platform-specific attribute "Bar" BarType bar = mxbean.getBar();
2) Access the Sun-specific MXBean interface via MBeanServer
MBeanServerConnection mbs; // Connect to a running JVM (or itself) and get MBeanServerConnection // that has the JVM MXBeans registered in it ... try { // Assuming the RuntimeMXBean has been registered in mbs ObjectName oname = new ObjectName(ManagementFactory.RUNTIME_MXBEAN_NAME); // Get standard attribute "VmVendor" String vendor = (String) mbs.getAttribute(oname, "VmVendor"); // Check if this MXBean contains Sun's extension if (mbs.isInstanceOf(oname, "com.sun.management.RuntimeMXBean")) { // Get platform-specific attribute "Bar" BarType bar = (String) mbs.getAttribute(oname, "Bar"); } } catch (....) { // Catch the exceptions thrown by ObjectName constructor // and MBeanServer methods ... }
Unless otherwise noted, passing a null argument to a constructor
or method in any class or interface in this package will cause a NullPointerException
to be thrown.
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JavaTM 2 Platform Standard Ed. 5.0 |
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Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.