Jython: Packing several .py on .jar, problem importing .py modules within the .jar

Gubatron gubatron at gmail.com
Wed Dec 3 18:54:51 CET 2008

I've managed to solve this problem.

I can now run a python script that lives inside a Jar. The python
script is now able to import other scripts within the same jar, and
it's also able to import java classes that live within the jar.

The problem was solved by giving the Jython Interpreter the proper
initialization. This entails:

- Giving it a class loader that has put the Jar on it's class path
- Adding the path of the jar to the interpreter's sys.path

Here's an example:

			org.python.core.PySystemState pySys = new
			pySys.setClassLoader(((URLClassLoader) classLoaders.get(jarFile)));

			//We also have to pass the jar to JYTHON_PATH (sys.path)
			//so that it can properly import inner python modules.
			pySys.path.insert(0,new PyString(jarFile));

			//We pass the PythonInterpreter the modified PySystemState
			PythonInterpreter i = new PythonInterpreter(null, pySys);

On Dec 3, 6:31 am, Gubatron <gubat... at gmail.com> wrote:
> Hello all,
> I've a problem with Jython and importing .py inside a jar.
> I'm putting .class and .py files inside .jar files.
> myjar.jar
>   MyJar\SomeClass.class
>   MyJar\main.py
>   MyJar\otherModule.py
> So I add the myjar.jar to Jython's sys.path
>                         org.python.core.PySystemState pySys = new
> org.python.core.PySystemState();
>                         pySys.path.insert(0,new PyString("/path/to/myjar.jar"));
> and execute main.py
>                         //We pass the PythonInterpreter the modified PySystemState
>                         PythonInterpreter i = new PythonInterpreter(null, pySys);
>                         //Find the entry in the jar for the python file and execute it.
>                         //It should be able to find any resource inside the jar.
>                         JarFile jFile = new JarFile("/path/to/myjar.jar");
>                         ZipEntry zipEntry = jFile.getEntry("MyJar/main.py");
>                         InputStream pythonInputStream =
> jFile.getInputStream(zipEntry);
>                         i.execfile(pythonInputStream);
> main.py will execute fine, it'll be able to do
> from MyJar import SomeClass
> with no problem
> However, If I try to import the other .py in the same jar, it won't
> find it:
> from otherModule import *
> or
> from MyJar.otherModule import *
> I always get this:
> ImportError: no module named otherModule
>         at org.python.core.Py.ImportError(Unknown Source)
>         at org.python.core.imp.import_first(Unknown Source)
>         at org.python.core.imp.import_name(Unknown Source)
>         at org.python.core.imp.importName(Unknown Source)
>         at org.python.core.ImportFunction.load(Unknown Source)
>         at org.python.core.ImportFunction.__call__(Unknown Source)
>         at org.python.core.PyObject.__call__(Unknown Source)
>         at org.python.core.__builtin__.__import__(Unknown Source)
>         at org.python.core.imp.importFromAs(Unknown Source)
>         at org.python.core.imp.importFrom(Unknown Source)
>         at org.python.pycode._pyx1.f$0(<iostream>:26)
>         at org.python.pycode._pyx1.call_function(<iostream>)
>         at org.python.core.PyTableCode.call(Unknown Source)
>         at org.python.core.PyCode.call(Unknown Source)
>         at org.python.core.Py.runCode(Unknown Source)
>         at org.python.util.PythonInterpreter.execfile(Unknown Source)
> I've tried adding more paths to sys.path, with no luck:
> pySys.path.insert(0,new PyString("/path/to/myjar.jar/MyJar"));
> pySys.path.insert(0,new PyString("file:jar:/path/to/myjar.jar!"));
> and nothing works, any ideas would help. I know this has to work,
> because I previously had a problem where I couldn't do
> import os
> and then I added the "Lib/" folder inside jython.jar and now I'm able
> to import all those standard jython modules, so, somehow, jython is
> able to import .py within a .jar, help would be very much appreciated.
> Angel Leon

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