RE: java.lang.NoClassDefFoundError: org/python/parser/ast/VisitorBase

most common problem is jython.jar is not on your classpath; it also makes
life easier to compile all the *.py modules in the jython lib directory into
a separate jar which can be used to support imports from those libs when not
running as jython.

-----Original Message-----
From: jython-users-admin@xxxxxxxxxxxxxxxxxxxxx
[mailto:jython-users-admin@xxxxxxxxxxxxxxxxxxxxx]On Behalf Of Phil
Sent: Thursday, March 30, 2006 2:57 PM
To: jython-users@xxxxxxxxxxxxxxxxxxxxx
Subject: [Jython-users] java.lang.NoClassDefFoundError:
org/python/parser/ast/VisitorBase
Importance: Low


Hi all,

I'm a newbie to the world of Jython, and am already addicted to it.  
Alas, I've hit one problem which has me stumpted and Google has been no 
help.

I have developed a GUI using Swing in eclipse and it works fine from 
eclipse or by executing using the jython <filename> command.  However 
when I use jythonc to create a jar file for distribution, although no 
problems are reported the resulting jar will not execute (I've tried Mac 
OS X and Win XP - same result). I used the following command (a 
different error occurs if I use --core rather than --all).

jythonc --all --jar myjar.jar myjython.py

(On Windows I had to add -C <javac path> - but the result is the same)

Now my original version of my GUI worked no problem as a jar, since that 
I've implemented a generic extension of the JMenu class that 
automatically adds actionListeners and Keystrokes from a dictionary of 
object references and specifc keystrokes and added a few more Swing 
components.  However the fact that it runs in Eclipse leads me to 
believe that the new constructs I use are good and supported by Jython 
as it would be in Python.  I have also used an almost identical menu 
subclass in another program I've written no problem.

I've had a look at Jython's internal directory structure and the one 
thing that has struck me is that the 'ast' directory contains no 
build.xml file.  I believe these are used for building with Ant, but I'm 
out of my depth as far as my Java knowledge goes (I have a Python 
background and a basic grounding in Java).

I'm using Jython 2.2a1 and Java 1.5.

I'm at my whits end with this, so any help or pointers would be greatly 
appreicated - I can forward the code if needs be, but my own analysis 
suggests the issue is elsewhere.

Many thanks,

Phil.


$ java -jar test.jar
Exception in thread "main" Traceback (innermost last):
  File "/Users/philipbeadling/dev/GuiBuilder/jythonGui.py", line 0, in main
java.lang.NoClassDefFoundError: org/python/parser/ast/VisitorBase
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
        at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
        at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
        at 
org.python.compiler.ProxyMaker.addClassDictInit(ProxyMaker.java:742)
        at org.python.compiler.ProxyMaker.build(ProxyMaker.java:782)
        at org.python.core.MakeProxies.makeProxy(MakeProxies.java:76)
        at org.python.core.PyClass.init(PyClass.java:128)
        at org.python.core.PyClass.<init>(PyClass.java:84)
        at org.python.core.Py.makeClass(Py.java:1562)
        at org.python.core.Py.makeClass(Py.java:1484)
        at jythonGui$_PyInner.main$20(jythonGui.java:495)
        at jythonGui$_PyInner.call_function(jythonGui.java:205)
        at org.python.core.PyTableCode.call(PyTableCode.java:213)
        at org.python.core.PyCode.call(PyCode.java:14)
        at org.python.core.imp.createFromCode(imp.java:191)
        at org.python.core.Py.runMain(Py.java:856)
        at jythonGui.main(jythonGui.java:552)

java.lang.NoClassDefFoundError: java.lang.NoClassDefFoundError: 
org/python/parser/ast/VisitorBase




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