Home Original page

JPython org.python.modules Problem

Kevin Howe khowe at performance-net.com
Wed Jan 12 15:26:55 EST 2000 
I found the following thread in the Python Mailing List archives (June 99).
It describes the Jpython problem that I as well as serveral others in the
comp.lang.python newsgroup are having trouble with. It includes details on
how to patch jpython's "jar.py" and "main.py" to fix the problem. I haven't
been able to get the patch to work, I am hoping that someone will be able to
figure this out and post the working version.

ciao,
kh

-------- Patching JPython Thread -----------

>From bwarsaw at cnri.reston.va.us Tue, 8 Jun 1999 18:36:56 -0400 (EDT)
Date: Tue, 8 Jun 1999 18:36:56 -0400 (EDT)
From: Barry A. Warsaw bwarsaw at cnri.reston.va.us
Subject: [JPython] Problems with HelloWorld applet under 1.1

>>>>> "DP" == Darren Platt <daz at exelixis.com> writes:

    DP> I installed 1.1 a few days ago and have been trying to get
    DP> basic things working, under NT, and the jdk1.2 (after some
    DP> nasty jre crashes using jre 1.1.8).  To get to the point,
    DP> trying to compile a simple HelloWorld applet;

    DP> Compiling goes well:

    DP> But running the applet under the jdk applet viewer

    DP> Gives a traceback:

    DP> Looking at the java for the core Jpython code, it refers to
    DP> org.python.modules.Setup in org.python.core.PySystemState, and
    DP> that code doesn't get included in the jpython.jar and not into
    DP> the created hw.jar file, and hence doesn't run :(

    DP> Any ideas ?

Yes, that's a bug.  Attached is a fix, although I'm not 100%
comfortable with it.  Perhaps Setup should be moved to
org.python.core?  I'd rather leave it in org.python.modules though...

(I'm still digging into jpythonc so this might change)

-Barry

-------------------- snip snip --------------------
Index: jar.py
===================================================================
RCS file: /projects/cvsroot/jpython/dist/Tools/jpythonc2/jar.py,v
retrieving revision 2.0
diff -c -r2.0 jar.py
*** jar.py 1999/05/19 20:11:59 2.0
--- jar.py 1999/06/08 22:31:00
***************
*** 23,29 ****
--- 23,33 ----
          self.entries = []
          self.packages = packages
          self.manifest = []
+         self.singleclasses = []

+     def addSingleClass(self, class_):
+         self.singleclasses.append(class_)
+
      def addFile(self, rootdir, filename):
          self.files.append( (rootdir, filename) )

***************
*** 72,83 ****
--- 76,102 ----
          for package, skiplist in self.packages:
              self.addPackage(package, skiplist)

+         for class_ in self.singleclasses:
+             self.addOneClass(class_)
+
          self.dumpManifest()

      def dump(self, filename):
          self.zipfile = ZipOutputStream(FileOutputStream(filename))
          self.dumpFiles()
          self.zipfile.close()
+
+     # add just one class from a package
+     def addOneClass(self, pkgclass):
+         parts = pkgclass.split('.')
+         package = string.join(parts[:-1], '.')
+         pkg = lookup(package)
+         filename = os.path.join(pkg.__path__[0], parts[-1]) + '.class'
+         entryname = string.join(parts, '/') + '.class'
+         self.zipfile.putNextEntry(ZipEntry(entryname))
+         instream = FileInputStream(filename)
+         copy(instream, self.zipfile)
+         instream.close()

      # The next three methods handle packages (typically org.python.core,
...)
      def addPackage(self, package, skiplist=[]):
Index: main.py
===================================================================
RCS file: /projects/cvsroot/jpython/dist/Tools/jpythonc2/main.py,v
retrieving revision 2.2
diff -c -r2.2 main.py
*** main.py 1999/06/08 20:14:28 2.2
--- main.py 1999/06/08 22:29:58
***************
*** 158,164 ****
      if options.jar is not None:
          options.deep = 1
      elif options.core or options.all:
!         opts.deep = 1

      if not os.path.isabs(options.workdir):
          options.workdir = os.path.join(".", options.workdir)
--- 158,164 ----
      if options.jar is not None:
          options.deep = 1
      elif options.core or options.all:
!         options.deep = 1

      if not os.path.isabs(options.workdir):
          options.workdir = os.path.join(".", options.workdir)
***************
*** 265,270 ****
--- 265,273 ----

      for dep in comp.trackJavaDependencies():
          ja.addEntry(dep)
+
+     if opts.core or opts.all:
+         ja.addSingleClass('org.python.modules.Setup')

      ja.dump(jarfile)
More information about the Python-list mailing list