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COPE, a tool based on EMF that eases the migration of models in response to an evolving metamodel. COPE explicitly records the history of the metamodel as a sequence of changes and allows to attach information of how to migrate models (which is referred to as coupled evolution). The attached information can be used to automatically migrate models to the new version of the metamodel. COPE even goes one step further and allows to reuse combinations of metamodel adaptation and model migration steps across metamodels.

" Why Object Teams? Team spirit for your objects Building complex systems from isolated objects often yields poor structure which readily decays during system evolution. Objects should team-up in order to co-operate and jointly deliver complex behaviors. Objects play specific roles within a given Team. Context based dispatch Role instances are attached as specializers to existing objects. Object behavior is controlled by the currently active context that determines which roles are active at a given point in time. Contexts are reified into team instances, which may further be used to mediate between roles and maintain state of the collaboration. Modules larger than classes On the road to re-use of modules larger than classes two approaches compete: frameworks and components. For many applications white box frameworks are too fragile and black box components to rigid. Object Teams provide a middle road which balances encapsulation and adaptability. "

Legacy systems embrace a large number of technologies, making the development of tools to cope with legacy systems evolution a tedious and time consuming task. As modernization projects face with both technologies combination and various modernization situations, model-driven approaches and tools offer the requisite abstraction level to build up mature and flexible modernization solutions. MoDisco provides an extensible framework to develop model-driven tools to support use-cases of existing software modernization :

"The Eclipse Modeling Project focuses on the evolution and promotion of model-based development technologies within the Eclipse community by providing a unified set of modeling frameworks, tooling, and standards implementations."

"The goal of JavaMelody is to monitor Java or Java EE applications servers in QA and production environments. It is not a tool to simulate requests from users, it is a tool to measure and calculate statistics on real operation of an application depending on the usage of the application by users. JavaMelody is opensource (LGPL) and production ready: in production in an application of 25 person years. JavaMelody is easy to integrate in most applications and is lightweight (no profiling and no database). JavaMelody is mainly based on statistics of requests and on evolution charts. "

JDBC realm has a lot of attention in recent months. This blog summarizes the evolution of the JDBC realm implementation in GlassFish and explains how the latest implementation works. I would like to thank Jean-Baptiste, and Richter for their contributions and comments. The participation from the open source community definitely helps everyone. I encourage all of you to give feedback, participate, and help evolve this feature further. GlassFish always had the capability for anyone to plug-in a realm. Implementing a custom realm in the Sun Java System Application Server EE 8.0 is described in the article Authentication Using Custom Realms in Sun Java System Application Server. In S1AS 7.x, there is a JDBC Realm bundled in sample. Jean-Baptiste formally filed an enhancement and provided a clear text version of JDBCRealm for GlassFish. Richter wrote another implementation because the GlassFish JDBCRealm at that time not compatible with Tomcat.

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