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From "Shapira, Yoav" <Yoav.Shap...@mpi.com>
Subject RE: Alternate class and lib directories
Date Wed, 29 Sep 2004 16:43:47 GMT

Hi,
By the way, to clarify a point: I wasn't saying you should change your
CVS organization or build process, just the deployment.  It'd be fairly
trivial to write an Ant task to create a WAR for each module from your
directory structure: deploy that WAR and you're golden.

Yoav Shapira
Millennium Research Informatics


>-----Original Message-----
>From: Shapira, Yoav
>Sent: Wednesday, September 29, 2004 12:40 PM
>To: Tomcat Users List
>Subject: RE: Alternate class and lib directories
>
>
>Hi,
>In Tomcat, the location of the classes and libraries for your web
>application is not configurable.  You have a choice of several
>repositories, as explained in the Classloader How-To
>(http://jakarta.apache.org/tomcat/tomcat-5.0-doc/class-loader-howto.htm
l
>).  These are not limited to WEB-INF/classes or WEB-INF/lib: you can
use
>the common or shared repositories as well.
>
>In addition, as you've noted, you can use custom classloaders with
>Tomcat which will load classes from wherever and however you want.
>
>But IMHO, it'd be a waste of time on your behalf and the result would
be
>mediocre if you choose to stick with your current approach.  Instead,
>deploy according to the Servlet Specification (even while in
>development), and put all your classes and libs in WEB-INF/classes and
>WEB-INF/lib respectively.  You'll save time and effort, and gain
>portability: exactly what you lost when you relied on Resin's
>proprietary classloading hook.
>
>Yoav Shapira
>Millennium Research Informatics
>
>
>>-----Original Message-----
>>From: Nathan Voxland [mailto:nathan@sundog.net]
>>Sent: Wednesday, September 29, 2004 12:27 PM
>>To: tomcat-user@jakarta.apache.org
>>Subject: Alternate class and lib directories
>>
>>We are attempting to move our existing development environment from
>>Resin to Tomcat, but I am having difficulties getting our build
>>environment to work with Tomcat.
>>
>>We have many project going on a the same time, most consisting of
>>multiple CVS modules set up where the main module depends on a
>>sub-module which depends on a sub-module etc.  For example:
>>
>>moduleRoot/src/java
>>moduleRoot/src/java-test
>>moduleRoot/src/root/web    <-- document root
>>moduleRoot/build               <-- where classes are compiled to for
>>this module
>>moduleRoot/build-test
>>moduleRoot/lib                   <-- where all the required .jar files
>>go
>>
>>subModuleRoot/src/java
>>subModuleRoot/src/java-test
>>subModuleRoot/src/build    <-- where classes are compiled to for this
>>module
>>subModuleRoot/src/build-test
>>
>>We have our IDE's set to compile to the build directory and our ant
>>tasks that do things like JDO enhancing and our automated build system
>>work with this directory structure.
>>
>>My problem is that Tomcat expects classes to be in WEB-INF/classes and
>>jars in WEB-INF/lib, not where we have them.  Resin gives you the
>>ability to configure your class loader like this:
>>
>>        <class-loader>
>>            <simple-loader path="/cvs/moduleRoot/build"/>
>>            <simple-loader path="/cvs/subModuleRoot/build""/>
>>            <library-loader path="/cvs/moduleRoot/lib""/>
>>        </class-loader>
>>
>>but I can't find anything similar in Tomcat.
>>
>>I have been trying to overload and/or re-implement WebappLoader and
>>WebappClassLoader but have been having no luck.  I know tomcat is
>>running my Loaders because the debug info I add gets printed out, but
I
>>continue to get ClassNotFoundExceptions when on the filters and
context
>>listeners I have set up in my web.xml.
>>
>>I've mainly been focusing on trying to call addRepository in
>>WebappClassLoader passing in moduleRoot/build, subModuleRoot/build,
and
>>moduleRoot/lib, but that doesn't seem to be helping.  I also tried
>>completely re-implementing WebappLoader starting with the original
>code,
>>but I haven't been able to get that to work yet, plus I don't like
>>having to duplicate so much code when I feel I should be just
extending
>>existing classes.
>>
>>Can anyone give me a direction to look, or point me to some
>>configuration info I have missed?
>>
>>Thanks,
>>Nathan
>
>
>
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