Myfaces-extensions.jar depends on some org.apache.commons.digester.rss.* files in commons-digester-1.5.jar that are no longer part of the binary distribution in commons-digester-1.6.jar. Not sure how you want to resolve that but I don't think everyone that wants to use myfaces-extensions.jar will have to choose between switching to commons-digester 1.5 and compiling their own jar with the digester.rss code or making their own myfaces-extension.jar.
Maybe that myfaces rss component should live in its own jar since it depends on example code? This is from the 1.6 release notes: RSS Support ----------- The RSS package present in previous distributions of Digester was only ever intended to be a "worked example", so the code has been moved to the "src/examples/api/rss" directory within the CVS repository, and is no longer part of the standard Digester binary distribution. However the same package structure has been preserved, so any users who were using the rss code in production should just have to compile the example code and include that additional jar in the classpath. These classes are still contained in the source distribution and so (for those for which such things matter) are still officially released (though no longer distributed in the binary).

