I have been working with the JOnAS Java 2 EE application server for about 5 years now, meanwhile
I have several projects, one of them is rather big already, it contains about 60-70 EJB’s, two thirds
of them are CMP/CMR’ed entity beans, the rest stateless session beans.
I am thinking about migrating these projects to Geronimo for some months now, and I decided to
wait for the first Java EE 5 release of Geronimo (Geronimo 2) – as it will be released within the
near future I would be interested in which migration strategies you could suggest?
I think the most problematic part will be to migrate the ca. 50 CMP entity beans, there are a lot
of EJB-QL finders and all of those beans are inter-related with CMR.
Currently I’m thinking of doing a “soft” migration, i.e. migrating 1 by 1 of those EB’s within the
currenty architecture from CMP to hibernate, and after that performing the move to Geronimo (which will
mean that then only the session beans will have to be migrated which should be less problematic).