[Jython-dev] Re: WEB-INF/classes & WEB-INF/lib/*.jar inaccessible in jython servlet

[Brian Z. <bri...@ya...>]

Hi Finn,

----- Original Message -----
From: "Finn Bock" <bc...@wo...>
To: <jyt...@li...>
Sent: Monday, February 12, 2001 1:37 PM
Subject: Re: [Jython-dev] WEB-INF/classes & WEB-INF/lib/*.jar inaccessible
in jython servlet


> On Mon, 12 Feb 2001 12:08:30 -0800, you wrote:
>
> >These classes are accessible from java servlet and JSP pages, but not
> >from jython servlet. The workaround would be to include those in
> >CLASSPATH of tomcat startup script, but... you know.
>
> I have not yet look at this in depth, but I think the classes from lib &
> classes are available as classes, but not as jython package namespaces.
> You can test this by trying to load a class from withon the .py file
> with java.lang.Class.forName(). I guess this should work, but the normal
> jython import does not work.
>

Unfortunately this (try load a <context>/WEB-INF/classes class from jython
servlet with java.lang.Class.forName()) does not work.

What I'm trying to do actually is putting XMLC (see http://xmlc.enhydra.org)
compiled pages inside <context>.

From within a jython servlet, "java.class.path" System property value does
not include <context>/WEB-INF/classes at all. So basically jython servlet
has no idea where to get these classes.

Two observations, if I have testpkg.TestClass under
<context>/WEB-INF/classes:

1. I happen to place org.python.util.PyServlet under tomcat_home/classes, if
I add
try {
    Class.forName("testpkg.TestClass").newInstance();
}
catch (Exception ex) {
    System.err.println(e.toString());
}
to PyServlet.java, class loading fails.

2. If I add the above code to a servlet within the same <context>, it loads
okay.

Which is reasonable, but also suggests that servlet class loading does
something special when within a <context>. PyServlet need to borrow the same
logic. I didn't test JSP, but I believe it should be the same as servlet.

/Brian

> As a temporary workaround you can add the java packages to the jython
> package manager yourself with add_package.
>
> sys.add_package("testpackage")
> from testpackage import TestClass
>
> >Anyway, enough complains.
> >
> >I take a brief look at tomcat 3.2 source code at
> >
> >    :pserver:an...@ja...:/home/cvspublic/jakarta-tomcat
> >    /src/share/org/apache/tomcat
> >
> >context/LoaderInterceptor.java seems to be where it adds WEB-INF/classes
> >and WEB-INF/lib/*.jar to the classloader class repositories.
> >
> >Can we do similar things in PyServlet.java ?
>
> It should be possible to force the jython package manager to search
> these two wellknown places for java classes and packages. Perhaps by
> setting python.packages.paths and python.packages.directories. Perhaps
> by calling the package manager directly. More on later.
>
> regards,
> finn
>
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