JDK-8253225 : Release Note: Object Monitors No Longer Keep Strong References to Their Associated Object
- Type: Sub-task
- Component: hotspot
- Sub-Component: runtime
- Affected Version: 16
- Priority: P5
- Status: Closed
- Resolution: Delivered
- Submitted: 2020-09-16
- Updated: 2021-12-02
- Resolved: 2021-12-02
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| JDK 16 |
|---|
16Resolved  |
Description
When synchronization is performed on an object, an association is established between the object and the object monitor that implements the synchronization. In the past, the reference from a monitor to its associated object was a strong reference. These strong references would be observable through JVM TI functions that walk the heap (reported as `JVMTI_HEAP_ROOT_MONITOR` or `JVMTI_HEAP_REFERENCE_MONITOR`) and in heap dumps (reported as `HPROF_GC_ROOT_MONITOR_USED`). As of this release, a weak reference is used. These are not observable to JVM TI or heap dumps. Consequently, `JVMTI_HEAP_ROOT_MONITOR`, `JVMTI_HEAP_REFERENCE_MONITOR` and `HPROF_GC_ROOT_MONITOR_USED` are longer reported.
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