FYI. The Apache Harmony project (under ASF incubation) is creating a "compatible, independent implementation of J2SE 5 under the Apache License v2".
http://incubator.apache.org/harmony/ They are using Derby as one of the test applications, currently with the Harmony class libraries and the IBM test JVM they have 82% of derbyall passing (from 10.1.2.1). http://wiki.apache.org/harmony/Apache_Derby Dan.
