Re: [Jython-users] How to call super class attributes in Python-derived Java classes

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

Hello,

I have simplified my problem of accessing super class attributes to the
following simple files--

Java super class:

public class Foo {
    String outputTags;

    public Foo() {
        outputTags = new String("This is the Foo string!");
    }
}

Python class that subclasses this Foo java class:

import Foo

class Bar(Foo):

    def __init__( self ):
        "Do nothing since jythonc will call Foo's constructor."
        pass

    def testAttributeCall( self ):
        "@sig public java.lang.String testAttributeCall()"
        return self.outputTags

Java file to test jythonc's creation of Bar.class:

import Bar;

class TestAttribute
{
    public static void main(String args[]){
        Bar myBar = new Bar();
        System.out.println( myBar.testAttributeCall() );
    }
}

This fails with:

AttributeError: instance of 'Bar' has no attribute 'outputTags'.

The problem is also present if the Bar.py file is used (with an added
Foo.__init__(self) call) from within Jython.

So the question remains, how does one call super class attributes to
avoid the AttributeError?

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