[Zope] Java class doesn't load correctly under windows

23 Aug 2004

      Hi,

I'm trying to programatically load a java class file to a folder on the 
Zope DB called 'JMFiles' during the initialization of a Product called 
JMColorPicker. It works under linux, but on windows 2000 the applet 
isn't showed and I got an error on the java console which says:

Error loading class: ColorPicker
java.lang.ClassFormatError

Then I tried  to manually load the applet class file on the ZMI and it 
worked. Printing the filesystem path reveals that it is correctly 
separated with "\". But, some how, manage_addFile corrupts the file on 
Windows.

The code is attached to the message. Does somebody knows what the error 
could be?

Thanks in advanced,
Josef

__doc__="""Misc utilities"""
__version__ ='$Revision: 0.1 $'[11:-2]
#File: Misc.py located on Products/JMUtils

DATA_BASE_PATH='/JMFiles'
def _createFileInFolder(context, filePath, fileName,
                       zopePath, title=''):
  """Creates a the folder <zopePath> and puts the
     file <filePath>/<fileName> on it
  """
  pathLen=len(zopePath)
  #Remove leading slash
  if (zopePath[-1]=='/') and (pathLen>1):
    zopePath=zopePath[0:pathLen-1]

  if zopePath[0]!='/':
    #The product will only work with relative paths
    #if the instances can adquire them.
    log('The path "%s" is relative.' %zopePath,
        severity=WARNING,detail='For better results use absolute paths.',
        product='createFileInFolder')
    zopePath='/'+zopePath
  pathParts=os.path.split(zopePath)
  basePath=pathParts[0]
  folder=pathParts[1]
  #This only happens when no slash is given at
  #the beginning of the path, so the root will
  #be assumed
  fileContainer=context.unrestrictedTraverse(basePath,None)
  if fileContainer==None:
    log('The path "%s" doesn\'t exist on the Zope DB.' %basePath,
             severity=PROBLEM,detail='Create it first.',
             product='createFileInFolder')
    return
  fileFolder=fileContainer
  #If the given path wasn't the zope root
  if folder!='':
    try:
      manage_addFolder(fileContainer,folder,'JMFiles')
    except:
      #The Folder already exists
      pass
    fileFolder=getattr(fileContainer,folder)
  absolutePath=os.path.join(filePath,fileName)
  data=file(absolutePath)
  try:
    manage_addFile(fileFolder,fileName,file=data,
                   title=title)
  except:
    #The file was already created on a previous session
    pass

I called it on the __init__.py of my Product:

__doc__="""JMColorPicker initialization module."""
__version__ ='$Revision: 0.1 $'[11:-2]
#File __init__.py located on Products/JMColorPicker

from JMColorPicker import JMColorPicker, manage_addJMColorPickerForm, \
                                      manage_addJMColorPicker
from Products.JMUtils import Misc
import Globals, os

PRODUCT_HOME=Globals.package_home(globals())
def initialize(context):
  try:
    context.registerClass(JMColorPicker,
                          constructors=(
                            manage_addJMColorPickerForm,
                            manage_addJMColorPicker,
                          ),
                          icon='images/icon.gif',
                         )
    context.registerHelp()
    #The applet is under "PRODUCT_HOME/java"
    absolutePath=os.path.join(PRODUCT_HOME,'java')
    appContext=context._ProductContext__app
    Misc._createFileInFolder(appContext,absolutePath,'ColorPicker.class',
      Misc.DATA_BASE_PATH,title='ColorPicker Applet')
  except:
    from sys import exc_info, stderr
    from traceback import format_exception
    from string import join

    type,val,tb=exc_info()
    stderr.write(join(format_exception(type, val, tb),''))

    del type,val,tb

[Zope] Java class doesn't load correctly under windows

Josef Meile