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  1. JDK
  2. JDK-7087658

MethodHandles.Lookup.findVirtual is confused by interface methods that are multiply inherited

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    Backports

      Description

        Given this test case:

        interface A {
           Iterable m(List<String> ls);
        }

        interface B {
           Iterable<String> m(List l);
        }

        interface AB extends A, B { }

        interface AA extends A { }


        If I do:

               MethodHandle mh1 = MethodHandles.lookup().findVirtual(A.class, "m", MethodType.methodType(Iterable.class, List.class));
               MethodHandle mh2 = MethodHandles.lookup().findVirtual(B.class, "m", MethodType.methodType(Iterable.class, List.class));
               MethodHandle mh3 = MethodHandles.lookup().findVirtual(AB.class, "m", MethodType.methodType(Iterable.class, List.class));
               MethodHandle mh4 = MethodHandles.lookup().findVirtual(AA.class, "m", MethodType.methodType(Iterable.class, List.class));

        I would expect all the lookups to succeed. However, only lookups for A, B, and AA succeed; lookups for AB fail with

         java.lang.NoSuchMethodException: no such method: AB.m(List)Iterable

        It fails the same way when the generics are removed. So it appears to be a problem with an interface multiply inheriting the same method and not overriding it.

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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-8003094 MethodHandles.Lookup.findVirtual is confused by interface methods that are multiply inherited

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

            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-8003095 MethodHandles.Lookup.findVirtual is confused by interface methods that are multiply inherited

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

            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-8019017 MethodHandles.Lookup.findVirtual is confused by interface methods that are multiply inherited

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8009129 Illegal access error when calling method reference

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed
            duplicates

            Bug - A problem which impairs or prevents the functions of the product. JDK-8014013 CallInfo structure no longer accurately reports the result of a LinkResolver operation

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8000999 backport of JSR 292 to 7u

            • P1 - Blocks development and/or testing work, production could not run.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8014013 CallInfo structure no longer accurately reports the result of a LinkResolver operation

            • P3 - Major loss of function.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-7157574 method handles returned by reflective lookup API sometimes have wrong receiver type

            • P3 - Major loss of function.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-7191363 JSR 292 regression: problem described in 7087658 is unresolved

            • P3 - Major loss of function.
            • Closed

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                twisti Christian Thalinger
                briangoetz Brian Goetz
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