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  1. JDK
  2. JDK-8164512

Replace ClassLoader use of finalizer with phantom reference to unload native library

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    • Enhancement
    • Resolution: Fixed
    • P3
    • 10
    • 10
    • core-libs

    Description

      This issue will track the work to convert ClassLoader finalizer to use phantom reference to unload native library.

      An earlier prototype uncovers an issue related to JNI_FindClass that is called during JNI_OnUnload that resurrects the caller class which has been GC'ed.

      I think JNI FindClass should not be called during JNI_OnUnload [1]. This would require further investigation, for example, whether it's possible to prohibit JNI_FindClass is called during JNI_OnUnload (to avoid resurrecting the caller's class). Also might be useful to gather some data to determine how high the compatibility risk is for JNI_FindClass not to work in JNI_OnUnload.

      1] https://bugs.openjdk.java.net/browse/JDK-4240589?focusedCommentId=13474512&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13474512

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          csr for

          CSR - null JDK-8187882 Replace ClassLoader use of finalizer with phantom reference to unload native library

          • P3 - Major loss of function.
          • Closed
          duplicates

          Bug - A problem which impairs or prevents the functions of the product. JDK-6219879 (cl) ClassLoader.NativeLibrary.load should be consistent in initialization of handleID

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          is blocked by

          Bug - A problem which impairs or prevents the functions of the product. JDK-8188052 JNI FindClass needs to specify the class loading context used for library lifecycle hooks

          • P3 - Major loss of function.
          • Resolved
          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8191360 Lookup of critical JNI method causes duplicate library loading with leaking handler

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-5086661 JDK 1.5's temporary native libraries may not be deleted on VM exit

          • P5 - Cosmetic problem like misspelt words or misaligned text.
          • Closed

          Enhancement - null JDK-8253568 Replace and mitigate Object.finalize() uses in JDK libraries

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Open

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              mchung Mandy Chung
              mchung Mandy Chung
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              Dates

                Created:
                Updated:
                Resolved: