That will produce a java.lang.invoke.WrongMethodTypeException: (Ljava/lang/Object;[Ljava/lang/Object;)V cannot be called without a receiver argument as ([Ljava/lang/Object;)Ljava/lang/Object;
imho casting to Object and Object[] in mh.invokeExact((Object)Class.class, (Object[])new Class[0]); is without effect, since invokeExact is a vargs method an everything will just be put into an Object[] anyway. We had not a compiler change for this kind of thing, had we? bye Jochen Am 07.02.2012 17:52, schrieb Jim Laskey: > Try > > MethodType type = MethodType.methodType(Constructor.class, > Class[].class); > MethodHandle mh = MethodHandles.lookup().findVirtual(Class.class, > "getDeclaredConstructor", type); > MethodType target = MethodType.methodType(void.class, Object.class, > Object[].class); > mh = MethodHandles.explicitCastArguments(mh, target); > mh.invokeExact((Object)Class.class, (Object[])new Class[0]); > > Cheers, > > -- Jim > > On 2012-02-07, at 12:37 PM, Jochen Theodorou wrote: > >> Am 07.02.2012 17:29, schrieb Jim Laskey: >>>>>> MethodType type = MethodType.methodType(Constructor.class, >>>>>> Class[].class); >>>>>> MethodHandle mh = >>>>>> MethodHandles.lookup().findVirtual(Class.class, >>>>>> "getDeclaredConstructor", type); >>>>>> MethodType target = MethodType.methodType(Object.class, >>>>>> Object.class, Object.class); >>>>>> mh = mh.asType(target); >>>>>> mh.invokeWithArguments(Class.class,new Class[0]); >>> >>> As soon as you mh = mh.asType(target); it is no longer vararg, so it >>> is treating new Class[0] as the second argument cast to Object. If >>> you are trying to type as (Object , Object[]). I think you are going >>> to run into difficulties validating (Class[]) Object[]. You may have >>> to add a wrapper to get what you want, but you could also try using >>> asCollector. >> >> or in other words: I should not use invokeWithArguments for this. >> >> If I wanted to use the same target type... since that is what my call site >> gives me... and I wanted to use invokeExact instead, how would I have to >> change the program? >> >> bye blackdrag >> >> -- >> Jochen "blackdrag" Theodorou - Groovy Project Tech Lead >> blog: http://blackdragsview.blogspot.com/ >> german groovy discussion newsgroup: de.comp.lang.misc >> For Groovy programming sources visit http://groovy-lang.org >> > -- Jochen "blackdrag" Theodorou - Groovy Project Tech Lead blog: http://blackdragsview.blogspot.com/ german groovy discussion newsgroup: de.comp.lang.misc For Groovy programming sources visit http://groovy-lang.org _______________________________________________ mlvm-dev mailing list mlvm-dev@openjdk.java.net http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev
