JDiff has been tested with JDK1.5.0 Beta 1. Only one minor change was necessary to make it compile (in RootDocToXML.java) and this has been checked into CVS. Support for the new language features has not yet been added, since there can be no changes in them until 1.5.0. Beta 2!
I have also created a report showing the changes between JDK 1.4.2 and JDK 1.5.0 Beta 1, available on the homepage.