A few understandings of Java framework

Java framework is too much, a large number of online copy, there is no understanding of what. I still use my experience to describe the framework of the Java EE.
1. First force pushes the struts2 frame, which is the most classic frame (can say no "one"). can help you quickly build out an MVC model. (Note: Struts1 is rarely used, and there are many problems, it is highly recommended to use STRUTS2).
The 2.Spring framework, which is the second-ranked framework (I am personally ranked, non-authoritative), is where its "dependency injection" and "inversion of control" are all about. Simply put, the parameters are injected into the container when the program is running.
3. Persistent layer Frame Select Hibernate and Ibatis. Hibernate automation ability, the development of large-scale applications can save development time, Ibatis small and concise, flexible.
4.Jquery is the second prototype after another excellent javacript framework, encapsulated a lot of JavaScript methods, is the development of JSP framework, is currently very popular

General development, all using struts2+spring+hibernate (ibatis) integration, front end with jquery or other similar frameworks. For simple systems, sometimes a framework of spring MVC is used.

Truts1 struts2 Hibernate spring JSF toplink jdo jbpm Lucene OPENJPA

Don't too much.
Learn the most popular Structs2, Spring, Hibernate
After you learn this, you will naturally understand what you have to learn later.

A few understandings of Java framework