Re: J2EE, Spring, Hibernate, EJB .... what the ???

Lew <>
Tue, 08 Dec 2009 22:49:58 -0500
Arne Vajh??j wrote:

The entire Java EE stack is pretty big.

1) Very short version:

Hibernate = O/R-Mapper (and can be used in Java SE as well)
Spring = IoC framework (and can be used in Java SE as well)
EJB's = components used in business logic layer
JSP = template system used in presentation layer
Servlet = typically used for controllers in control layer
JCA = adapters for external systems
JSF = component based presentation and control layer build on JSP (and

2) Short version

Lookup the above items at Wikipedia.

3) Medium version

Read SUN's Java EE tutorial.

4) Long version.

Download the specs (as PDF files) and read them.

Playing with actual deployment is worthwhile, too. Start light - just, say,
Tomcat with an IDE like Eclipse or NetBeans or whatever. This gives you some
of the Java EE stack, and you can mix in features like JPA with Hibernate
JARs, JSF, and quite a bit of the other interesting things. The rest of the
Java EE load comes in free downloads like GlassFish, JBoss and Apache
Geronimo, that rival the big guns like WebSphere. I've found multi-core
platforms with gobs of RAM to be helpful with full-fledged Java EE servers.


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