EJB 3.0 has become the industry standard after introducing the domain driven pojo based development over EJB 2.x which was lacking popularity because of the complex design.
EJB 3.0 currently provides persistence using JPA(Java Persistence API) which can also run out of the container and is totally separable.
EJB 3.0 simplifies the problem of XML based deployment descriptors by providing Java 5 based annotations for each unit of EJB 3.0 and now there is no need to maintain large and complex XML files to declare EJB components.
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