# JVM ## Java Virtual Machine (JVM) Attributes This document defines Java Virtual machine related attributes. | Attribute | Type | Description | Examples | Stability | | ---------------------- | ------- | ----------------------------------------- | -------------------------------------------------- | ---------------------------------------------------------------- | | `jvm.buffer.pool.name` | string | Name of the buffer pool. [1] | `mapped`; `direct` |  | | `jvm.gc.action` | string | Name of the garbage collector action. [2] | `end of minor GC`; `end of major GC` |  | | `jvm.gc.name` | string | Name of the garbage collector. [3] | `G1 Young Generation`; `G1 Old Generation` |  | | `jvm.memory.pool.name` | string | Name of the memory pool. [4] | `G1 Old Gen`; `G1 Eden space`; `G1 Survivor Space` |  | | `jvm.memory.type` | string | The type of memory. | `heap`; `non_heap` |  | | `jvm.thread.daemon` | boolean | Whether the thread is daemon or not. | |  | | `jvm.thread.state` | string | State of the thread. | `runnable`; `blocked` |  | **[1]:** Pool names are generally obtained via [BufferPoolMXBean#getName()](). **[2]:** Garbage collector action is generally obtained via [GarbageCollectionNotificationInfo#getGcAction()](). **[3]:** Garbage collector name is generally obtained via [GarbageCollectionNotificationInfo#getGcName()](). **[4]:** Pool names are generally obtained via [MemoryPoolMXBean#getName()](). `jvm.memory.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used. | Value | Description | Stability | | ---------- | --------------- | ---------------------------------------------------------- | | `heap` | Heap memory. |  | | `non_heap` | Non-heap memory |  | `jvm.thread.state` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used. | Value | Description | Stability | | --------------- | --------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------- | | `blocked` | A thread that is blocked waiting for a monitor lock is in this state. |  | | `new` | A thread that has not yet started is in this state. |  | | `runnable` | A thread executing in the Java virtual machine is in this state. |  | | `terminated` | A thread that has exited is in this state. |  | | `timed_waiting` | A thread that is waiting for another thread to perform an action for up to a specified waiting time is in this state. |  | | `waiting` | A thread that is waiting indefinitely for another thread to perform a particular action is in this state. |  |