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  1. JDK
  2. JDK-8269983

BootstrapMethodError with method reference and intersection type

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Details

    • Bug
    • Resolution: Fixed
    • P3
    • 20
    • 11, 17
    • tools
    • b19

    Description

      Under JDK 8, the following program compiles and runs successfully.

      Under JDK 11 and newer, it fails at runtime with a BootstrapMethodError.

      I'd expect it to either be rejected by javac at compile-time, or succeed at runtime, but not compile and then fail at runtime.

      This may be related to JDK-8269020, although that issue can be worked around by expressing the intersection bounds consistent, which doesn't apply to the following repro.

      public class Z {

        public static void main(String[] args) {
          f();
        }

        static <T extends Comparable<T> & G> C<T> f() {
          return new C<>(Q::g);
        }

        public interface G {}

        private interface E<T> {
          void g(Q g, T value);
        }

        static class C<T extends Comparable<?>> {
          C(E<T> g) {}
        }

        static class Q {
          void g(G g) {}
        }
      }

      Exception in thread "main" java.lang.BootstrapMethodError: bootstrap method initialization exception
      at java.base/java.lang.invoke.BootstrapMethodInvoker.invoke(BootstrapMethodInvoker.java:194)
      at java.base/java.lang.invoke.CallSite.makeSite(CallSite.java:307)
      at java.base/java.lang.invoke.MethodHandleNatives.linkCallSiteImpl(MethodHandleNatives.java:258)
      at java.base/java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:248)
      at Z.f(Z.java:9)
      at Z.main(Z.java:5)
      Caused by: java.lang.invoke.LambdaConversionException: Type mismatch for lambda argument 1: interface java.lang.Comparable is not convertible to interface Z$G
      at java.base/java.lang.invoke.AbstractValidatingLambdaMetafactory.validateMetafactoryArgs(AbstractValidatingLambdaMetafactory.java:279)
      at java.base/java.lang.invoke.LambdaMetafactory.metafactory(LambdaMetafactory.java:328)
      at java.base/java.lang.invoke.BootstrapMethodInvoker.invoke(BootstrapMethodInvoker.java:127)
      ... 5 more

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              sadayapalam Srikanth Adayapalam (Inactive)
              cushon Liam Miller-Cushon
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                Created:
                Updated:
                Resolved: