The Java grade is not enabled by default at the moment.
Mention that the Java grade is sometimes broken (like now).
* The .NET CLR back-end now bootstraps.
-* Major improvements to the Java back-end.
+* Improvements to the Java back-end.
* The cost in disk space of enabling debugging is now much smaller.
Numerous minor improvements to the Mercury standard library.
Mercury test suite.  See README.DotNet for details.
-  bugs, and implemented a lot more of the Mercury standard library.
-  See README.Java for details.
+is still quite buggy in places and is sometimes completely broken.