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  1. JDK
  2. JDK-6990438

(ref) Soft reference could consider strong if GC decides not to clear

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    Details

    • Type: Enhancement
    • Status: Open
    • Priority: P4
    • Resolution: Unresolved
    • Affects Version/s: 7
    • Fix Version/s: None
    • Component/s: core-libs
    • Subcomponent:
    • CPU:
      generic
    • OS:
      generic

      Description

      The scenario is depicted in this object graph:
         Root -> .... -> SR -> A -> ... -> WR -> B -> ....

      where SR is a SoftReference that points to object A and WR is a WeakReference
      that points to object B. Both A and B are not reachable.

      As specified in the java.lang.ref spec, B is softly reachable as
      (1) B is not strongly reachable, and
      (2) B can be reached by traversing a soft reference (SR)

      B is not weakly-reachable since it is softly reachable as described
      above.

      When GC decides not to clear the soft reference, it would be intuitive
      to consider that as a strong reference for the rest of the GC operation
      and therefore clear WR and reclaim B. The behavior conforming to
      the current specification doesn't clear WR (as B is not weakly reachable).

      This RFE is to request an enhancement to the java.lang.ref API to
      support this new behavior.

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              Assignee:
              Unassigned Unassigned
              Reporter:
              mchung Mandy Chung
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