RE: [Jython-users] CLASSPATH problem under Tomcat

[brian z. <bz...@zi...>]

Are you using the latest CVS version of jython?  Finn has 
fixed where the jars and clases under your WEB-INF were
not being found.  Since the servlet container does not add
the WEB-INF/* subdirs to the CLASSPATH, jython originally
had no means of getting to those classes.  But the patch
added support to have the jython classloader look in optional
directories for jar's and class'es.  I have tested this under
JRun with great success and I believe others have used
Tomcat.

Again, the latest CVS has these features so you'll have to
upgrade or move the jars to another directory already added
to the CP by the servlet container.

hope this helps,

brian

-----Original Message-----
From: jyt...@li...
[mailto:jyt...@li...]On Behalf Of Sarwar
Raza
Sent: Friday, February 16, 2001 6:03 AM
To: Jaroslav Gergic; jyt...@li...
Subject: Re: [Jython-users] CLASSPATH problem under Tomcat


Hi..
I posted a similar problem a few days ago. I have
tried adding the application specific jars to my
classpath (referring to the jars themselves and not
just their directories) but the jpyton interpreter
_will not_ pick them up. The only jars cached by the
package manager are those in the ..JRE/lib/ext
directory. This is a serious problem for me. Any help
would be much appreciated.

Some additional detail:
the jpython modules are run within a jpython
interpreter embedded within the application. i.e.
there is no CLI. I create a jpython interpreter object
and pass it the name of the module to run. If any of
these modules contain and 'import from' clause for a
package from a jar _not_ contained witin
../JRE/lib/ext, the package manager _will not_ pick
them up. I can go crazy importing java.util.Hashtable
or javax.util.Timer for example, but cannot import
from com.foo.bar unless foobar.jar is in
../JRE/lib/ext. I need to change this so that I can
load libs from a custom directory.

Thanks
-Sarwar

 
--- Jaroslav Gergic <j_g...@ya...> wrote:
> Hello all,
> I have the following problem with classpaths under
> Tomcat:
> 
> Short intro:
> all JAR files located in $TOMCAT_HOME/lib are added
> to the Java CLASSPATH and are visible to Jython.
> NOTE: Their classes are loaded by the system
> classloader.
> 
> All JAR files located in an application specific lib
> directory + application classes directory are
> visible to 
> a given application.
> Application specific classes located in:
> $TOMCAT_HOME/webapps/myapp/WEB-INF/classes
> Application spec. libraries in:
> $TOMCAT_HOME/webapps/myapp/WEB-INF/lib
> NOTE: application specific classes are loader using
> org.apache.tomcat.loader.AdaptiveClassLoader12 (!)
> 
> There is only oneway visibility: application classes
> can
> refer to classes loaded by the system classloader
> but NOT vice versa.
> 
> I have my runtime library mylib.jar located in
> the application lib directory togehter with the
> jython.jar
> $TOMCAT_HOME/webapps/myapp/WEB-INF/lib/mylib.jar
> $TOMCAT_HOME/webapps/myapp/WEB-INF/lib/jython.jar
> 
> THE PROBLEM:
> jython does not see the classes from mylib.jar,
> it only creates cache for the packages found in 
> the standard Java classpath. (meaning
> $TOMCAT_HOME/lib + JRE/lib + ...)
> 
> How to turn jython to inlcude mylib.jar into package
> cache and make mylib.jar classes accessible?
> 
> NOTE: I can not move mylib.jar to $TOMCAT_HOME/lib
> becaus mylib.jar requires access to application
> specific classses.
> 
> Thans for any hint
> Gergic
> 
> 
> 
> 
> 
> =====
> Jaroslav Gergic (Gergi)
> mailto:j_g...@ya...
> http://nenya.ms.mff.cuni.cz/~gergic/
> 
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=====
*************************
Sarwar S Raza
NMS Software Engineer
CommWorks Corporation
http://www.wpi.edu/~sraza
*************************

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