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From "Michael Lipp (JIRA)" <jetspeed-...@portals.apache.org>
Subject [jira] Created: (JS2-274) Digester uses wrong class loader
Date Tue, 31 May 2005 09:40:55 GMT
Digester uses wrong class loader
--------------------------------

         Key: JS2-274
         URL: http://issues.apache.org/jira/browse/JS2-274
     Project: Jetspeed 2
        Type: Bug
  Components: Other  
    Versions: 2.0-M3    
 Environment: Linux/JBoss
    Reporter: Michael Lipp
 Attachments: patch.txt

I'm trying to pack Jetspeed2 in an EAR. The basic setup is: all libraries that are "shared"
in Tomcat become client modules in the EAR (so they are "common" components in the classpath
of all WAR modules). Libraries in WEB-INF/lib take precedence (as specified for servlets).
Xerces, Xalan and xml-apis have been removed from the WARs; latest versions are configured
using the endorsed libraries mechanisms as recommended (besides not being compliant to the
mechanism's specification, having individual XML libraries in every WAR's/PA's classloader
consumes a lot of memory).

In this environment I find that the Digester cannot load all classes. By default, the digester
uses its own class loader to lookup class in the ObjectCreateRule. This should work if the
digester can only be found in the WAR's WEB-INF/lib. This does not seem to be the case. I
haven't tracked down why (propably it is due to the use of "common" XML libraries which causes
the Digester class in the Tomcat container to be used). As class loaders are explicitly passed
around in Jetspeed, they should be used anyway and used to configure the Digester. Where explicit
classloaders are not available, the context class loader should be used. I have provided a
patch against M3.

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