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Language management interface

Eclipse OpenJ9 provides MXBean extensions to the standard java.lang.management API, which can be used to monitor and manage the Java™ virtual machine. These extensions provide access to information about the state of the OpenJ9 VM and the environment in which it is running. The following tables list the MXBeans by package and describe the monitoring or management capabilities.

Package: com.ibm.lang.management

MXBean Description
GarbageCollectorMXBean Discovers Garbage Collection (GC) operations (collection times, compactions, heap memory usage, and freed memory).
JvmCpuMonitorMXBean Discovers CPU consumption by category (GC, JIT, or other threads).
MemoryMXBean Discovers memory usage (minimum and maximum heap sizes, and shared classes cache sizes).
MemoryPoolMXBean Discovers memory pool usage for specific GC policies.
OperatingSystemMXBean Discovers information about the operating system (memory, CPU capacity/utilization).
RuntimeMXBean Discovers information about the runtime environment (CPU load, Java process ID, and VM state)
ThreadMXBean Discovers information about native thread IDs.
UnixOperatingSystemMXBean Discovers information for Unix operating systems (memory, file descriptors, processors, processor usage, and hardware)

Package: com.ibm.virtualization.management

MXBean Description
GuestOSMXBean Discovers CPU and memory statistics of a virtual machine or logical partition as seen by the Hypervisor.
HypervisorMXBean Discovers whether the operating system is running on a hypervisor and provides information about the hypervisor.

Package: openj9.lang.management

MXBean Description
OpenJ9DiagnosticsMXBean Configures and dynamically triggers dump agents.

For more information about using these MXBeans, read the API documentation. For Java 8, see the OpenJ9 Language Management API documentation.