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
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