Re: [Jython-users] CLASSPATH problem under Tomcat

[Sarwar R. <raz...@ya...>]

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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