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  1. JDK
  2. JDK-8068254

Method reference uses wrong qualifying type

    Details

    • Type: Bug
    • Status: Closed
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 9
    • Component/s: tools
    • Labels:
    • Subcomponent:
    • Resolved In Build:
      b47
    • Verification:
      Verified

      Backports

        Description

        A reference to a method declared in a package-access class (via a public subtype) compiles to a lambda bridge; the qualifying type in the bridge method is the declaring class, not the referenced class. This leads to an IllegalAccessError.

        ---
        package p1;
        class A {
            public static void m() { System.out.println("A.m"); }
        }
        ---
        package p1;
        public class B extends A {
        }
        ---
        package p2;
        public class Test {
            public static void main(String... args) {
                p1.B.m(); // ok
                Runnable r = p1.B::m; r.run(); // runtime error
            }
        }
        ---

        $ -> java p2.Test
        A.m
        Exception in thread "main" java.lang.IllegalAccessError: tried to access class p1.A from class p2.Test
        at p2.Test.lambda$MR$main$m$64fce12b$1(Test.java:7)
        at p2.Test$$Lambda$1/1160460865.run(Unknown Source)
        at p2.Test.main(Test.java:8)

        $ -> javap -verbose -private p2.Test
        ...
          public static void main(java.lang.String...);
            descriptor: ([Ljava/lang/String;)V
            flags: ACC_PUBLIC, ACC_STATIC, ACC_VARARGS
            Code:
              stack=1, locals=2, args_size=1
                 0: invokestatic #2 // Method p1/B.m:()V
                 3: invokedynamic #3, 0 // InvokeDynamic #0:run:()Ljava/lang/Runnable;
                 8: astore_1
                 9: aload_1
                10: invokeinterface #4, 1 // InterfaceMethod java/lang/Runnable.run:()V
                15: return
        ...
          private static void lambda$main$0();
            descriptor: ()V
            flags: ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC
            Code:
              stack=0, locals=0, args_size=0
                 0: invokestatic #5 // Method p1/A.m:()V
                 3: return

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                • Assignee:
                  sadayapalam Srikanth Adayapalam
                  Reporter:
                  dlsmith Dan Smith
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                  Dates

                  • Created:
                    Updated:
                    Resolved: