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Asked: 2026-05-23T17:54:25+00:00

I was doing some reading up on building a soap service using jax-ws as

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I was doing some reading up on building a soap service using jax-ws as part of java 6. I read that the operations that can be invoked by a client can be defined in the SEI, or Service Endpoint Interface. These operations can be implemented by a SIB, aka “Service Implementation Bean“. The part that troubles me, is that this SIB “can either be a POJO or a Stateless Session EJB” according to page 4 of this book. The same definition applies on wikipedia. However, I read that a POJO (according to wikipedia) is “an ordinary Java Object, not a special object, which does not follow any of the major Java object models, conventions, or frameworks such as EJB“. Thus follows my question, how can I know that my SIB is a POJO? Additionally, what is the difference between implementing my web service operations via a POJO or a stateless session EJB?

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  1. Editorial Team

    EJB 3.0 introduced annotations that allow any POJO to become a stateless session bean. Therefore the sentence “[a SIB] can either be a POJO or a Stateless Session EJB” applies to stateless session beans pre-EJB 3.0 (such as EJB 2.1). You can now write your SIB as a POJO – that is, without extending any other class or implementing any special interface that you didn’t write yourself. You will still need an EJB container, though, such as WebLogic Server, IBM WAS or jBoss if you want to use EJBs.

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