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EJB design: Reusability of a J2EE app

  1. Reusability of a J2EE app (1 messages)

    Hi all,

    I have with me a big J2EE application, containing JSP, servlets, EJBs, etc, developed by someone else. My boss asked me to take a look at it, and see if there is any reusable components in it, so that we can take them and use. My questions are:

    1. Should I look only at EJBs? I mean is it only EJBs are reusable, and servlets and JSPs are not?

    2. If I'm suppose to look at EJBs, should I focus on entity beans, since session beans contain mostly business logic and may not reusable?

    3. Because it's such a huge app, can someone advise me on how I should go about identifying which components are reusable? I mean, should I look directly at the codes, or documentation?

    Thanks in advance for your advice.

    Regards,
    Alvin
  2. Reusability of a J2EE app[ Go to top ]

    Well, ultimately, it depends how you define re-usable and what you want to re-use them for.

    For instance, if you wanted to re-use the code to implement the exact same set of requirements then one would hope it's all re-usable. If, on the other hand, you wanted to determine which could would be re-usable to implement a graphics library in Assembly, I'm going to have to assume none.

    That said, there are some general starting points:
    EJBs and Beans are probably the most likely to contain generalized code that would be good candidates for re-use. Servlets and JSPs may well be re-usable, depending on how they were written, what they do, and what you want to re-use them for, but if I were going to vaguely categorize them, I'd say they're less likely to be re-use candidates than the EJBs and Java Beans that support them.