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
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