Re: [Jython-users] Simple java class import

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

Hi.

The idea of the patch is fine for me, on the other hand
it needs some work to better integrate with the rest
of the import logic.

In any case I would like to understand why so often
jars are reported as bad, this should be quite rare...

I think we should dig into that.

regards, Samuele.



> From: bc...@wo... (Finn Bock)
> To: jyt...@li...
> Subject: Re: [Jython-users] Simple java class import
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> X-Original-Date: Wed, 12 Sep 2001 18:16:09 GMT
> Date: Wed, 12 Sep 2001 18:16:09 GMT
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> [Humbel Otmar]
> 
> >Hello,
> >
> >when there is an 'invalid' .jar file in the classpath from where java can
> >load classes, but from which the jython package manager cannot determine
> >packages (other people have told us about similar problems with the jar
> >utility here), I would nonetheless like to be able to import single java
> >classes.
> >
> >The problem manifests as follows (package CH.obj.Libraries.Servlet lives
> >inside the offending bisonInfra.jar):
> >
> >
> >[appl|pwe] > jython
> >*sys-package-mgr*: processing modified jar, 'E:\java\lib\bisonInfra.jar'
> >*sys-package-mgr*: skipping bad jar, 'e:\java\lib\bisonInfra.jar'
> >Jython 2.0 on java1.3.0 (JIT: null)
> >Type "copyright", "credits" or "license" for more information.
> >>>> from CH.obj.Libraries.Servlet import ServletSessionContext
> >Traceback (innermost last):
> >  File "<console>", line 1, in ?
> >ImportError: No module named Servlet
> >>>> from java.lang import Class
> >>>> clazz = Class.forName( "CH.obj.Libraries.Servlet.ServletSessionContext"
> >)
> >>>> clazz
> ><jclass CH.obj.Libraries.Servlet.ServletSessionContext at 7698425>
> >>>> 
> >
> >
> >For an 'intuitive' Jython user like me, there is no obvious reason why this
> >import should fail ?
> 
> I agree.
> 
> >My motto is: Jython can import everything java can load !
> 
> I agree again. I hope you at least understand why importing java
> packages fails.
> 
> >With the following lines added just at the beginning of method importFromAs
> 
> Please add this as a patch to the SF patch manager. That way we will not
> forget it.
> 
> >in org/python/core/imp.java (from the 2.0 codebase):
> >
> >  public static void importFromAs(String mod, String[] names, String[]
> >asnames, PyFrame frame) {
> >    if ( names.length==1 && asnames.length==names.length &&
> >asnames[0].equals(names[0]) ) {
> >      // this is a candidate for simple java class import
> >      String packageName = mod;
> >      String fullClassName = packageName + "." + names[0];
> >      try {
> >        Class.forName( fullClassName );
> >        PySystemState.add_package( packageName );
> >      } catch( Throwable t ) {}
> >    }
> >    // rest of method left untouched
> >    // ...
> >  }
> >
> >the problem above would be solved. These lines do not at all claim to be
> >perfect, they are thought just to show that it could be done:
> 
> Of the top of my head, I kinda like it. It a pragmatic solution to a
> huge problem which we (I fear) will never resolve perfectly.
> 
> regards,
> finn
> 
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