module difflib not found

This is a piece of Java code where I try to use a Python source code file.

   try {
       Properties preProperties = System.getProperties();
       Properties postProperties = new Properties();
       postProperties.put("sys.path", "/home/lddekeyz/python/Libs");

       String[] input = { page1, page2 }; //defined above
       PythonInterpreter.initialize(preProperties, postProperties, input);
       PythonInterpreter interp = new PythonInterpreter();

       interp.execfile(inputStream);//also defined above, is a inputStream 
to a source file
       PyObject output = interp.get("output");
       String finalResult = (String) output.__tojava__(String.class);

       log.warn("the result is : " + finalResult);
       } catch (Exception e) {
           log.warn("=========> interpretion went wrong : " +  e);
       }

In this code file, the difflib module is imported. But when this Java code 
is run, I get following warning in my log:

WARNING: =========> interpretion went wrong : Traceback (innermost last):
 File "<iostream>", line 9, in ?
ImportError: no module named difflib

Any idea what's wrong here? The difflib.py module is in the Lib directory.

> If you don"t have a registry file, then it doesn"t
> matter.  The default sys.path is initialized from
> the "python.path" property.
>
>
> Lieven De Keyzer wrote:
> > public static void initialize(java.util.Properties preProperties,
> >                              java.util.Properties postProperties,
> >                              java.lang.String[] argv)
> > > is sys.path supposed to be in the preProperties or the postProperties?
> >
> > > >> From: Jeff Emanuel <jemanuel@xxxxx>
> >> To: Lieven De Keyzer <lieven_dekeyzer@xxxxx>
> >> CC: jython-users@xxxxx
> >> Subject: Re: [Jython-users] jython.jar in classpath
> >> Date: Sat, 28 May 2005 11:40:08 -0600
> >>
> >> Depending on what the python code calls, you probably need the
> >> Lib directory installed and sys.path pointing to it.
> >> Lieven De Keyzer wrote:
> >>
> >>> I"m making a webapplication in Java. I want to execute a piece of >>> 
> Python code in a Java class. Is it ok if I just make sure the the >>> 
> jython.jar file is in my classpath, or do I really need to have >>> jython 
> installed to be able to execute python code?
> >>>
> >>>
> >>>
> >>>
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