RE: bug with reflection

In Python you can call a method on an instance two ways:

1)  theInstance.method(args)
2)  theClass.method(theInstance,args)

When you are calling getName on your interface objects,
you are expecting to be using #1.  However, if the interface
has a getName method, then you are actually doing #2.
That is why it complains it expects one argument, the
instance.  For your code to work always, you ought to
do it like this:

  for i in interfaces:
    print "interface: ", java.lang.Class.getName(i)


> -----Original Message-----
> From: Curtis Brown [mailto:cpbrown@xxxxxxxxxxxxxxxxx]
> Sent: Wednesday, February 12, 2003 8:16 AM
> To: jython-users@xxxxxxxxxxxxxxxxxxxxx
> Subject: [Jython-users] bug with reflection
> 
> 
> I was trying to get jython to do some simple reflection, but it
> sometimes failes with a type error.  Here is the code:
> 
> import sys
> import java
> 
> if __name__ == '__main__':
>     arg = sys.argv[1]
>     c = java.lang.Class.forName(arg)
>     interfaces = c.getInterfaces()
>     for i in interfaces:
>         print "interface: ", i.getName()
> 
> The script takes a java class as an agument and is supposed to print
> all the interfaces the class implements.  It works sometimes but fails
> others:
> 
> % jython bug.py java.util.HashMap
> interface:  java.util.Map
> interface:  java.lang.Cloneable
> interface:  java.io.Serializable
> 
> % jython bug.py java.security.Identity
> interface: Traceback (innermost last):
>   File "bug.py", line 9, in ?
> TypeError: getName(): expected 1 args; got 0
> 
> The object c is an instance of org.python.core.PyJavaClass in every
> case.  Any idea why this doen not work? I'm running on solaris 2.8,
> with Jython 2.1 on java1.4.0 (JIT: null).
> 
> Thanks,
> Curt
> 
> 
> 
> 
> 
> 
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