Why is the EJB important and widely used today?
No, I don't think EJB is widely used today.
That is wrong.
EJB's is widely used today.
A search at dice.com says:
java and ejb - 1565 jobs
java and spring - 837 jobs
(probably with a huge overlap)
It was used a lot before
and it was a massive failure.
EJB has its successes and its failures.
I do not understand where you get that massive failure idea from.
Are there any books that will tie in all these J2/5EE related
technologies to help make good decisions on what to use and not to use?
Look for Rod Johnson's "Expert One-on-One J2EE Design and Development
(Programmer to Programmer)" and his follow-up "Expert One-on-One J2EE
Development without EJB", in which he explained why EJB (excluding
EJB3) was a flop.
That was not really what the posted asked for.
Rod Johnson is the founder of the Spring Framework and EJB3 is larged
based on the concept of Spring.
I think that is not completely true. There are some overlaps, but they
also cover different areas. They have similarities but certainly also
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