Issue547727

Jython does not appear to support loading of jar files which are specified in the MANIFEST.MF file, 
via the Class-Path attribute.

Logged In: NO 

Here's a workaround.  Import JythonClassPathMagic before
accessing the
java code in the jar file manifest Class-Path.

Jeff Emanuel
jemanuel@lgc.com

JythonClassPathMagic.py:
import java,sys

# This adds the class path elements specified in jar file
manifests to
# the jython package manager so the java packages and
classes listed
# in the manifests can be imported in jython.

def handleJarClassPath(jcp,parent):
  for p in jcp.split():
    f = java.io.File(parent,p)
    if p[-1]=='/':
      sys.packageManager.addDirectory(f)
    else:
      sys.packageManager.addJar(f.canonicalPath,1)

classpath=java.lang.System.getProperty('java.class.path')
for element in
classpath.split(java.lang.System.getProperty('path.separator')):
  try:
    jar = java.util.jar.JarFile(element)
    if jar:
      if jar.manifest:
        jarAttrs = jar.manifest.mainAttributes
        jarClassPath =
jarAttrs[java.util.jar.Attributes.Name.CLASS_PATH]
        if jarClassPath:
          f=java.io.File(element)
          handleJarClassPath(jarClassPath,f.parentFile)

  except java.io.IOException:
    pass

jythonc is no longer maintained.

re-opening as Oti pointed out that this is also true for non-jythonc. 
I'm still leaving it as "low" though, since I don't know if this should
hold up 2.5.0

Is there any active development on this?  It seems unusual that jython, loading a JVM would not recognize and entire jar, especially items in the manifest.  This basically leaves UberJar's unavailable for use with Jython?

Darren, it would seem to me the workaround in msg649 would still be applicable. Re singlejar support, there's Clamp - https://github.com/jythontools/clamp

Is this the same as #1778514?

Discussion there led me to the summary that there are work arounds, and we won't fix it because it is at odds with our package scanning. I could be wrong on both counts, however. And maybe our package scanning is not sufficient as it stands.