Runtime problem with method references

[Brian Goetz]

I believe this is already fixed; have you tried with a more recent build?

On Mar 26, 2013, at 8:15 PM, Howard Lovatt wrote:

> 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.
>