JDK-8176389 : Release Note: java.lang.ref.Reference.enqueue method clears the reference object before enqueuing
- Type: Sub-task
- Component: core-libs
- Sub-Component: java.lang
- Affected Version: 8u351,openjdk8u352,9
- Priority: P4
- Status: Closed
- Resolution: Delivered
- Submitted: 2017-03-08
- Updated: 2022-09-16
- Resolved: 2017-09-22
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Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
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| JDK 8 | JDK 9 |
|---|---|
| 8u351Resolved | 9Resolved  |
Description
`java.lang.ref.Reference.enqueue` method clears the reference object before it is added to the registered queue. When the `enqueue` method is called, the reference object is cleared and `get()` method will return null in JDK 9. Typically when a reference object is enqueued, it is expected that the reference object is cleared explicitly via the `clear` method to avoid memory leak because its referent is no longer referenced. In other words the `get` method is expected not to be called in common cases once the `enqueue`method is called. In the case when the `get` method from an enqueued reference object and existing code attempts to access members of the referent, `NullPointerException` may be thrown. Such code will need to be updated.