Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8164512

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

XMLWordPrintable

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

      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

            mchung Mandy Chung (Inactive)
            mchung Mandy Chung (Inactive)
            Votes:
            1 Vote for this issue
            Watchers:
            7 Start watching this issue

              Created:
              Updated:
              Resolved: