Runtime problem with method references

[Howard Lovatt]

Hi,

On my Mac running:

openjdk version "1.8.0-ea"
OpenJDK Runtime Environment (build
1.8.0-ea-lambda-nightly-h3500-20130225-b79-b00)
OpenJDK 64-Bit Server VM (build 25.0-b19, mixed mode)

The following gives the runtime error below.

/**
 * Bug in method references, doesn't work at runtime. Relevant part of
error message is:
 * <pre>
 * Caused by: java.lang.IllegalAccessException: member is private:
rhjod.stream.BugInMethodReferences.twice(double)double/invokeStatic, from
rhjod.stream.BugInMethodReferences$Calls$2
 * at java.lang.invoke.MemberName.makeAccessException(MemberName.java:732)
 * at
java.lang.invoke.MethodHandles$Lookup.checkAccess(MethodHandles.java:1135)
 * at
java.lang.invoke.MethodHandles$Lookup.checkMethod(MethodHandles.java:1098)
 * at
java.lang.invoke.MethodHandles$Lookup.getDirectMethodCommon(MethodHandles.java:1209)
 * at
java.lang.invoke.MethodHandles$Lookup.getDirectMethod(MethodHandles.java:1199)
 * at
java.lang.invoke.MethodHandles$Lookup.linkMethodHandleConstant(MethodHandles.java:1265)
 * </pre>
 *
 * @author Howard Lovatt
 */
public final class BugInMethodReferences {
  private static double twice(final double in) { return 2 * in; }

  @FunctionalInterface interface MethodDD { double call(double in); }

  private static enum Calls {
    Lambda {
      @Override MethodDD get() { return (in) -> twice(in); }
    },
    Reference {
      @Override MethodDD get() { return BugInMethodReferences::twice; }
    };
    abstract MethodDD get();
  }

  /**
   * @param notUsed the command line arguments
   */
  public static void main(final String... notUsed) {
    final double in = 42 / 2;
    System.out.println(Calls.Lambda + ": " + Calls.Lambda.get().call(in));
// OK
    System.out.println(Calls.Reference + ": " +
Calls.Reference.get().call(in)); // Crash!!!
  }
}


  -- Howard.