Java DB 10.4.1
The 10.4.1 version of Java DB, the world's most advanced Java database, has some really cool features -- asynchronous replication, table functions and JMX capabilities. Sun engineers worked within the Apache/Derby community to develop these features.
Results: A great team. A great product. A great community!
If you're a serious user of Java DB (and/or of Apache Derby) and plan to use this product in your business, you should consider the multi-platform, software support services for Java DB -- Sun's distribution of Apache Derby -- available at some amazing bargain prices at various service plan levels.
Sun provides support service plans for Java DB, which is, for all practical purposes, identical to Apache Derby.