Do you need RMI when using EJB and Containers?

Do you need RMI when using EJB and Containers?

Do you need RMI when using EJB and Containers? When is RMI used and for what type of communication?

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One service that an EJB container must provide is the low-level communication for remote access to each EJB that it hosts. While RMI might be used for the low-level communication, an EJB programmer or an EJB-client programmer need not concern himself/herself with the details, since one of the features of the EJB model is to hide these details from both.

With that said, it is a good idea to acquaint yourself with the basics of RMI when programming to EJB. Understanding concepts such as pass-by-value, type narrowing, serialization, etc. are almost essential to fully grasp the EJB invocation model and to program to the EJB architecture effectively.

A couple of good starting points for understanding EJB and its relationship to RMI can be found at the following links:

http://java.sun.com/products/jdk/rmi/index.html
http://developer.java.sun.com/developer/onlineTraining/rmi/RMI.html
http://developer.java.sun.com/developer/onlineTraining/EJBIntro/EJBIntro.html

This was first published in October 2003

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