Re: [Jython-users] Import and NoClassDefFoundError

[Samuele P. <pe...@in...>]

From: Edward Povazan <epo...@te...>
> Ok,
> I have __init__.py in the proper places.
> I have this hierarchy
> /impi
> /impi/core
> /impi/core/Impi.class    # java class with static methods, ie "looks like a
> module"
> /impi/core/editors.py    # a bunch of basic gui's used by the app.
> 
> In a jython console, I can do this:
> from impi.core import *        # works ok

but does it get you Impi?
it shouldn't.

> from impi.core.editors import *    # I get the exception here
> 
> editors.py contains:
> from impi.core import *
> 
> > But so your from impi.core import * will never
> > get you the Java class. Anyway why the error?
> In the console
> from impi.core import * works fine, and I can call the static methods in
> class Impi. Just when import is from another file, I get the problem.
> 
> > The thing you haven't said to us
> > is that you are doing the
> >     from impi.core import *
> > from a module inside impi.core, is that true?
> Yes, from editors.py

A-ah,

you get the error because Python import 
are interpreted first as relative to the package
of the current module:

that means that  inside import.core.editors

from impi.core import *

tries from impi.core.impi.core import * 
before from impi.core import * # top-level impi

now the first should fallback to the second
because Impi.class is not impi something,

So it seems we have still a case-sensitivity problem
we shouldn't have anymore. That one is a bug :(!.

OTOH from py.pkg import * never
gets to the possible Java classes inside py.pkg,
the single import yes or if you have already imported
them otherwise.  from java.pkg import * works OTOH.

Now for a workaround, it really depends on what
 do you want to get with from impi.core import *?
 
regards.

PS: as a style note it is better to avoid import *
in production code.