Dimdwarf is an unintrusive distributed application server for Java. You write single-threaded, event-driven POJO code - the server makes it multi-threaded, persisted and transactional. The primary target audience is developers of online multiplayer games. The programming model is the same as on Project Darkstar (now RedDwarf). Dimdwarf applications can be deployed on Darkstar with minimal modifications and vice versa.