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.
Cheers, -- Jim On 2012-02-07, at 12:14 PM, Jochen Theodorou wrote: > The problem can be easily reproduced using this: >> 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]); > > can someone tell me the mistake? > > bye Jochen > > Am 07.02.2012 17:04, schrieb Jochen Theodorou: >> Hi all, >> >> maybe someone can explain to me why method handles behave this way in my >> case. >> >> Bascially I have a handle for Class#getDeclaredConstructor(Class...) I >> created via unreflect. >> >> http://docs.oracle.com/javase/7/docs/api/java/lang/Class.html#getDeclaredConstructor%28java.lang.Class...%29 >> >> this handle is then created as a AdapterMethodHandle$AsVargsCollector. >> My targetType is Object(Object,Object) and the arguments to the call are >> the Class, and an empty Class[]. So the next steps are asType with the >> target type, adding a guard with catch, then my guards for the arguments >> and last I do an invokeWithArguments. >> >> What I get now is a ClassCastException with the message required class >> java.lang.Class but encountered class [Ljava.lang.Class; >> >> The guards are unrelated to the problem, since it happens without them >> as well. >> >> Now can anyone explain me why I get that exception? It doesn't really >> make sense to me atm. >> >> bye Jochen >> > > > -- > 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 _______________________________________________ mlvm-dev mailing list mlvm-dev@openjdk.java.net http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev
