If you are already familiar with previous Bonita versions and you have already developped your own applications on top of Bonita, we want to minimize your effort when migrating to Bonita v4. Compatibility from Bonita v3 to v4 is our main concern. For this milestone Bonita has been packaged as a java library and only plain java interfaces are provided (no session beans interface). Furthermore as there's no database persistence yet, all operations (including process deployment and execution) must be run in a single jvm.