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  1. JDK
  2. JDK-8193222

EnsureLocalCapacity() should maintain capacity requests through multiple calls

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Details

    • Bug
    • Resolution: Fixed
    • P4
    • 10
    • 9, 10
    • hotspot
    • b22
    • 9
    • b37

    Backports

      Description

        When multiple calls to EnsureLocalCapacity happen over the course of a java native method call (say, in the native method itself, as well as in a function called by the native method), an earlier request for a larger local capacity will be lost/overwritten by a later request for a smaller capacity.

        One result is that EnsureLocalCapacity calls can be ineffective for preventing the local ref warning issued under -Xcheck:jni ("WARNING: JNI local refs: XX, exceeds capacity: YY") because the request is "forgotten" due to subsequent (sometimes tricky to spot) calls to EnsureLocalCapacity.

        The attached test case demonstrates the problem when run with -Xcheck:jni.

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8194599 EnsureLocalCapacity() should maintain capacity requests through multiple calls

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

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8299519 EnsureLocalCapacity() should maintain capacity requests through multiple calls

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8225217 Backout: JDK-8224814: Remove dead JNIHandleBlock freelist code

            • P3 - Major loss of function.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8297106 Remove the -Xcheck:jni local reference capacity checking

            • P3 - Major loss of function.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8193271 ProblemList tools/launcher/TestXcheckJNIWarnings.java

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8193460 Take tools/launcher/TestXcheckJNIWarnings.java back off the ProblemList

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8231769 Test tools/javac/tree/MakeTypeTest.java fails with -Xcheck:jni

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

            Enhancement - null JDK-8043224 -Xcheck:jni improvements to exception checking and excessive local refs

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8296936 -Xcheck:jni creates WARNING: JNI local refs: xxx, exceeds capacity: 32 with jdwp agent active

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

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                dholmes David Holmes
                bchristi Brent Christian
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                  Created:
                  Updated:
                  Resolved: