Sleepycat Software has released Berkeley DB Java edition 2.0.54. Berkeley DB JE is an open source, non-relational embedded database written in Java. The data is exposed through "a Java Collections-style interface, as well as a programmatic interface similar to the Berkeley DB API." This is a bug fix release.
Andrei Kouznetsov has released Unified I/O 2.5, an open source (BSD license) class library that "allows random access to any data or stream (even over HTTP), and gives a clear difference between read only and read/write access." Version 2.5 can create streams from random access files and vice versa.