Bug in MethodHandles.convertArguments

[Raffaello Giulietti]

Yes, this seems a bug to me, too.

What about converting to Integer.class instead of int.class and letting
the boxing duties to the language compiler?

Raffaello


On 2010-05-10 21:11, Rémi Forax wrote:
> For me it's a new bug.
> I have checked with jdk7 latest binaries
> I will check with the mlvm repository sources when I will be at my 
> office with a fast connection.
> 
> public class ConvertBug {
>    public static Object foo(Object o1, Object o2) {
>      return null;
>    }
> 
>    public static void main(String[] args) {
>      MethodHandle mh = 
> MethodHandles.lookup().findStatic(ConvertBug.class, "foo",
>          MethodType.methodType( Object.class, Object.class, Object.class));
>      mh = MethodHandles.convertArguments(mh,
>          MethodType.methodType(Object.class, int.class, Object.class));
>      System.out.println("print mh "+mh);
>    }
> }
> 
> Exception in thread "main" java.lang.IllegalArgumentException: 
> mismatched parameter count
>      at sun.dyn.MemberName.newIllegalArgumentException(MemberName.java:409)
>      at sun.dyn.MethodHandleImpl.convertArguments(MethodHandleImpl.java:654)
>      at sun.dyn.ToGeneric.<init>(ToGeneric.java:102)
>      at sun.dyn.ToGeneric.of(ToGeneric.java:257)
>      at sun.dyn.ToGeneric.make(ToGeneric.java:249)
>      at sun.dyn.MethodHandleImpl.convertArguments(MethodHandleImpl.java:671)
>      at java.dyn.MethodHandles.convertArguments(MethodHandles.java:811)
>      at ConvertBug.main(ConvertBug.java:15)
> 
> 
> and I don't see any workaround :(
> 
> Rémi
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