to Khaleel:
because I passed 310-300A exam,and this exam is invalidation now,you can not buy voucher of this exam,so I think you will take the SCEA 5.0 exam.The question between the two exam is different,but I think ,SCEA exam is the hight level exam ,sun do not examine the technology detail in part II.
Prentice Hall - Sun Certified Enterprise Architect for
J2EE Technology Study Guide ,is useful when you don't know how to begin the picture.you also must read the book <<Core J2EE design
pattern>> because
you should point out the pattern name which you used in your design.EJB is sun suggest,so I alse suggest you use ebj in your design.