The Jt - J2EE Pattern Framework project has announced the release of version 1.3. "Jt1.3 features complete implementations of Command, Composite, Memento and Observer. The Command implementation (JtCommand) supports a request log, a queueing mechanism and undoable operations. Jt1.3 and the Command implementation also support multithreading: framework objects that inherit from JtThread or JtCommand are able to execute using an independent thread."