Re: java.lang.reflect.Array considered harmful?

robert kuzelj wrote:

> hi,
>
>
> > I'm messing with JMX and I'm trying to call
> >
> > Object invoke(Objectame, String opName, Object[] args, String[] 
> > signature)
> >
> > Problem: is there a way to create an empty String[] with JRuby?
> >
> > I've been messing with java.lang.reflect.Array and its newInstance 
> > method, but that doesn work because include_class-ing it will mess up 
> > JRuby, because it seems like java.lang.reflect.Array replaces JRuby's 
> > Array. I think this is the case, because after the include_class, I 
> > keep on getting the error message
> > "No method '<<' on Array"
>
>
> can you send the code?

Well this reprodcues the error message:
include_class "java.lang.reflect.Array"
foo=[]
foo << 1

Which is clear enough (the reflect.Array seems to replace Rubys Array).


The problematic JMX Code I'm trying to use is this ('mb' is an instance
of com.sun.jmx.mbeanserver.JmxMBeanServer):
mb.invoke(mem.objectName, "getThreadUserTime", [], [])

The first [] must be an Object[], the second one must be a String[].
The Object[] doesn't seem to be a problem; but no matter what I do,
the second parameter is always turned into a RubyArray instance.

I even tried hacks like calling
x = StringBuffer.new("")
"".toString.split("XXX"),
which  return an empty String array (or one containing an empty string), 
but that returns a RubyArray as well.



murphee
--
Blog @ http://jroller.com/page/murphee


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