I have an application that I have developed on my local box using
tomcat-4.0.3. The app works fine and in the server.xml file, I have not
specified the delegate attribute.
<Loader checkInterval="1"
className="org.apache.catalina.loader.WebappLoader"/>
I must deploy the app to another version of catalina that is near HEAD
of cvs. When doing so I get the following error:
java.lang.LinkageError: loader constraints violated when linking
org/xml/sax/EntityResolver class
at org.dom4j.io.SAXReader.read(SAXReader.java:298)
at org.dom4j.io.SAXReader.read(SAXReader.java:246)
I can get this error to go away by specifying delegate="true". However
this has other unacceptable consequences. Such as commons-logging using
log4j as the backend, now has all webapps logging to the same file or
duplicating all log entries in each webapps log files.
In both cases dom4j-1.3 and xerces-1.4.4 exist in WEB-INF/lib. I have
also made sure the xerces version in common/lib is 1.4.4 as well. I
have tried removing xerces from the WEB-INF/lib, but that makes no
difference.
Hopefully, there is an obvious fix to remove the linkage error without
setting delegate="true", but if not does anyone have some insight on the
problem with commons-logging and log4j existing in the common/lib
classloader?
john mcnally
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