It appears the contrib javadoc settings were incorrect - thats why there was a bunch of errors about reading the package-list and why some contrib-to-core links wouldn't work Same issue with the warnings from demo/core so changing those too - everything still appears to work, but contrib-core links that didn't now work and errors/warnings are gone
lucene/java/trunk/build.xml
lucene/java/trunk/contrib/contrib-build.xml