Cloudscape and Derby are relational database managers implemented in Java. Tomcat is the reference servlet container implemented in Java. This article is a cookbook, providing step-by-step recipes for integrating them in three common scenarios: the prototype integration, the casual integration, and the enterprise integration.
I have been waiting a while for Cloudscape/Derby to mature, and be offically relased as a finished product from Apache. Last time I checked they still had bugs to fix runing under a 1.5 JVM.
I am planing to use it in my next Java Applications, if they have a working 1.5 JVM version.