Working on your next SCWCD or SCBCD Java exam? You rather take a look at the SUN certification pages.
As you can see both ‘Sun Certified Web Component Developer for the Java Platform, Enterprise Edition 1.4 (CX-310-081)’ and ‘Sun Certified Business Component Developer for the Java Platform, Enterprise Edition 1.3 (CX-310-090)’ are discontinued by February 29, 2008. So all you people using the Head First EJB or the Head First Servlets & JSP, First Edition books, get rid of them (at least if you are using them for the exams mentioned):

Head First Servlets & JSP, First Edition is based on Servlets 2.4 and JSP 2.0 (Sun exam CX-310-081).
Head First EJB is based on EJB 2.0 (Sun exam CX-310-090).

However, there is a positive point to mention:
A second edition of Head First Servlets & JSP exists. If you’re thinking about buying this book read this first. As you can see the latest SCWCD exam doesn’t differ much to the discontinued one. So maybe we shouldn’t throw these books aside.

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