[Jython-users] Re: instance already instantiated error

[Andres Corrada-E. <co...@ci...>]

Hello,

Please bear with me. I'm new to Jython and want to use Python code in Java
development environment. My attempt is failing because of a "instance
already instantiated" error. I've simplified the rand.py code in
www.jython.org to this:

from java.util import Random

class rand(Random):

    def __init__( self ):
        "@sig public rand()"

       # Random.__init__( self )


    def nextDouble( self ):
        return Random.nextDouble( self )

I can use jythonc to turn this into a java class which I then use from a
simple java file:

import rand;

class TestRand
{
    public static void main(String args[]){
	rand firstRand = new rand();
	System.out.println( firstRand.nextDouble() );
    }
}

As long as I do not call Random.__init__(self) in rand.__init__, the
procedure works. But if I uncomment the line it fails with the
"instance already instantiated" error. Since the actual Python class that
I want to create needs to have something like,
JavaSuperClass.__init__(self, foo)
this commenting out of the line is not going to work for me.

Any ideas on what I am doing wrong? I'm using Jython-2.0. on a SunOs
machine.

Andres Corrada-Emmanuel
Senior Research Fellow
Center for Intelligent Information Retrieval
University of Massachusetts, Amherst