Re: Problem with invoke with method determined at runtime

[Per Bothner <per at bothner dot com>]

On 01/07/2012 07:34 AM, Bill Robinson wrote:
> Hi, I am trying to invoke a method to be determined at runtime on an
> object, but this approach is yielding an exception:
>
> (define-simple-class Test ()
>    ((test (arg :: int)) :: void
>     (java.lang.System:out:format "test %d\n" arg))
>    ((main (args :: String[])) :: void allocation: 'static
>     (let ((t ::Test (Test))
> 	 (method 'test))
>       (invoke t 'test 1)  ;; Ok
>       (invoke t method 2) ;;<---------------- FAILS
>       )))
>
> The result I get is this:
>
> test 1
> Exception in thread "main" java.lang.NullPointerException
> 	at gnu.expr.PrimProcedure.<init>(PrimProcedure.java:333)
> 	at gnu.kawa.reflect.ClassMethods.getMethods(ClassMethods.java:129)
> 	at gnu.kawa.reflect.ClassMethods.apply(ClassMethods.java:229)
> 	at gnu.kawa.reflect.Invoke.lookupMethods(Invoke.java:278)
> 	at gnu.kawa.reflect.Invoke.applyN(Invoke.java:185)
> 	at gnu.mapping.ProcedureN.apply3(ProcedureN.java:48)
> 	at Test.main(test.scm:10)

It works for me, using the latest SVN Kawa.  It also also works
on a old version of Kawa 1.11 that was convenient.

Could you try Kawa from Subversion?  And ell me exactly
what commands you used?
--
	--Per Bothner
per@bothner.com   http://per.bothner.com/