New Feature: Shielded Classloading
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Key: MWAR-84
URL: http://jira.codehaus.org/browse/MWAR-84
Project: Maven 2.x War Plugin
Issue Type: New Feature
Affects Versions: 2.0.2
Reporter: Carsten Ziegeler
Attachments: patch.txt
This patch adds a new option to the war plugin: it adds shielded class loading
to the web application which means that all servlets, filters and listeners in
the webapp do use an own classloader which works parent-last. So all classes
are first searched in WEB-INF/classes and WEB-INF/lib and then in the parent
classloader.
This avoids all the typical problems which might occur when using
commons-logging or when trying to have a different xerces/xalan version for
your web application.
The new feature rewrites the web.xml and adds wrappers to each servlet,
listener and filter in order to make it working. In addition, by default, all
jars are moved from WEB-INF/lib to WEB-INF/shielded/lib and everything from
WEB-INF/classes to WEB-INF/shielded/classes. This can be turned off.
We started this code as an own maven plugin in the Cocoon project. But the
maven lifecycle does not allow to get the plugin at the correct stage (after
the resources are copied to the webapp and before the war file is created). And
as this is a more general function and not Cocoon specific, it makes much more
sense to add this to the war plugin directly.
The code has minimal impact on the current plugin and is an optional feature
which is turned off by default.
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