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EJB 3 beans can be configured with annotations in Java Code, Deployment Descriptors in ejb-jar.xml and a mix of both of them. An interesting post tries to answer the question for which case what option should be used. In my Java EE 5 projects, however, I went another path and thought about probability of change and worse case scenarios. If something is not likely to be changed, I put it into an annotation. Rather instable configuration was extracted into ejb-jar.xml.