import java.io.File;

import org.python.util.PythonInterpreter;

public class JythonFactory
{
    private static JythonFactory instance = null;

    public synchronized static JythonFactory getInstance()
    {
        if (instance == null)
            instance = new JythonFactory();

        return instance;
    }

    public static Object getJythonObject(String interfaceName, String pathToJythonModule)
    {
        Object jyObject = null;

        PythonInterpreter interpreter = new PythonInterpreter();
        interpreter.execfile(pathToJythonModule);

        String tempName = pathToJythonModule.substring(pathToJythonModule.lastIndexOf("/") + 1);
        tempName = tempName.substring(0, tempName.indexOf("."));

        String instanceName = tempName.toLowerCase();
        String javaClassName = tempName.substring(0, 1).toUpperCase() + tempName.substring(1);

        String objectDef = " = " + javaClassName + "()";

        interpreter.exec(instanceName + objectDef);

        try
        {
            Class JavaInterface = Class.forName(interfaceName);
            jyObject = interpreter.get(instanceName).__tojava__(JavaInterface);
        }
        catch (ClassNotFoundException ex)
        {
            ex.printStackTrace();
        }

        return jyObject;
    }

}

import org.python.util.PythonInterpreter;

public class JythonFactory
{
    private static JythonFactory instance = null;

    public synchronized static JythonFactory getInstance()
    {
        if (instance == null)
            instance = new JythonFactory();

        return instance;
    }

    public static Object getJythonObject(String interfaceName, String pathToJythonModule)
    {
        Object jyObject = null;

        PythonInterpreter interpreter = new PythonInterpreter();
        interpreter.execfile(pathToJythonModule);

        String tempName = pathToJythonModule.substring(pathToJythonModule.lastIndexOf("/") + 1);
        tempName = tempName.substring(0, tempName.indexOf("."));

        String instanceName = tempName.toLowerCase();
        String javaClassName = tempName.substring(0, 1).toUpperCase() + tempName.substring(1);

        String objectDef = " = " + javaClassName + "()";

        interpreter.exec(instanceName + objectDef);

        try
        {
            Class JavaInterface = Class.forName(interfaceName);
            jyObject = interpreter.get(instanceName).__tojava__(JavaInterface);
        }
        catch (ClassNotFoundException ex)
        {
            ex.printStackTrace();
        }

        return jyObject;
    }

}

remove unnecessary import