[Jython-users] Robocode

[C. P. B. <cpo...@ho...>]

I have been trying to get jython working with a game called robocode,
http://robocode.alphaworks.ibm.com/home/home.html
The basic idea is that you write a class that inherits from a base class.
You write a run function for the default actions, as well as functions such
as onScannedRobot that process messages.  These virtual robots get put in an
arena and try to destroy each other.

I have *no* java experience, so I decided to try to get this working with
jython.  First of all, here's a very simple .java robot:
  package porter;
  import robocode.*;

  public class CPB extends Robot
  {
    public void run()


      while(true)


        ahead(100);
        turnGunRight(360);
        back(100);
        turnGunRight(360);
      }
    }

    public void onScannedRobot(ScannedRobotEvent e)
    {
      fire(1);
    }
  }
I have no idea what the package porter; line is for, so I ignored it.  I
added the robocode.jar to my classpath, and tried to translate this java
code to python.  Here's my python file:
  from robocode import *
  class pyrobot(Robot):
     def run(self):
        while(1):
           ahead(100)
           turnGunRight(360)
           back(100)
           turnGunRight(360)
     def onScannedRobot(self, event):
        fire(1)
I ran that through jythonc, and it compiled, but I got a depracation
warning.  I recompiled with -deprecation, and here's the output from
jythonc:
  0932:PWORK://d/robocode/robots/porter$ jythonc pyrobot.py
  processing pyrobot

  Required packages:
    robocode.dialog
    robocode.jdk13bugfix
    robocode.editor
    robocode*

  Creating adapters:

  Creating .java files:
    pyrobot module
      pyrobot extends robocode.Robot

  Compiling .java to .class...
  Compiling with args: ['c://jdk1.3.1_01/bin/javac.exe', '-deprecation',
'-classpath', 'C:\\jython-2.0\\jython.jar;.;C:\\Program
Files\\proe2000i2\\modchk\\java\\xml\\xml4j.jar;c:\\jython-2.0\\jython.jar;d
:\\robocode\\robocode.jar;.\\jpywork;;C:\\jython-2.0\\Tools\\jythonc;d:\\rob
ocode\\robots\\porter\\.;C:\\jython-2.0\\Lib;c:\\jython\\lib;C:\\jython-2.0'
, '.\\jpywork\\pyrobot.java']
  0  .\jpywork\pyrobot.java:100: warning:
jfindattr(org.python.core.PyProxy,java.lang.String) in org.python.core.Py
has been deprecated
          PyObject inst = Py.jfindattr(this, "onScannedRobot");
                            ^
  .\jpywork\pyrobot.java:110: warning:
jfindattr(org.python.core.PyProxy,java.lang.String) in org.python.core.Py
has been deprecated
          PyObject inst = Py.jfindattr(this, "run");
                            ^
  2 warnings
When I try to run a robocode battle with this robot, the robocode console
gives me the following error:


  java.lang.NoClassDefFoundError: porter/jpywork/pyrobot (wrong name:
pyrobot)
          at java.lang.ClassLoader.defineClass0(Native Method)
          at java.lang.ClassLoader.defineClass(Unknown Source)
          at java.lang.ClassLoader.defineClass(Unknown Source)
          at
robocode.JBotsClassLoader.loadRobotClass(JBotsClassLoader.java:55)
          at robocode.Battle.initialize(Battle.java:350)
          at robocode.Battle.run(Battle.java:42)
          at java.lang.Thread.run(Unknown Source)

Because of my utter lack of java knowledge, I am completely stuck.  Is it
even possible to do what I am trying to do?  If so, what should I try next?

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C. Porter Bassett       cporter at byu dot edu     www.et.byu.edu/~porter
odigo #: 3854128           ICQ #:38435505          AIM ID: cporterbassett
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"Pretend like this is a really witty saying." - Anonymous
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