instantiate Object by reflection

Hello everybody,

inspired by combinator parsing I try to instantiate objects by
reflection.
After parsing the following method gets a classname and a list of
arguments

 def makeInstance(clname: String, arglist: List[AnyRef]): AnyRef = {
   val argtypes = arglist.map(_.getClass).toSeq
   val args = arglist.toSeq
   Class.forName(clname).getConstructor(argtypes:
_*).newInstance(args: _*)
 }

The Java getConstructor-Call wants a vararg of Type Class... which
seems to be
ok.
The Java newInstance-Call wants a vararg of Type Object... which
causes the
following errormessage

|Grammatik.scala:66: error: type mismatch;
| found   : ?0 where type ?0
| required: AnyRef
|Note that implicit conversions are not applicable because they are
ambiguous:
| both method any2Ensuring in object Predef of type [A](x:
A)Ensuring[A]
| and method any2ArrowAssoc in object Predef of type [A](x:
A)ArrowAssoc[A]
| are possible conversion functions from ?0 to AnyRef
|    Class.forName(clname).getConstructor(argtypes:
_*).newInstance(args: _*)
|                                                                  ^

Especially the second line is a mystery to me.

What's wrong in my approach?

Hi
I want to use reflection to generate case classes from XML.
Any recommendations for a reflection tool for the job?
Can't use 2.10 nightly builds and new API because of coordination with
other libraries.

Tim

What's wrong with Class.forName? It has the virtue of simplicity, even
if it isn't necessarily the prettiest call in the standard library.

Donald

On Sun, Jan 1, 2012 at 9:10 AM, Tim P wrote:
> Hi
> I want to use reflection to generate case classes from XML.
> Any recommendations for a reflection tool for the job?
> Can't use 2.10 nightly builds and new API because of coordination with
> other libraries.