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I'm planning to study Java EE but I do not know where to start.
Based on Java EE version history there are technologies present in lower versions which are not available in the higher version. Do I need to learn J2EE 1.4 before learning Java EE 5 or 6? Or is it better to learn the latest version since their purpose of doing it is to improve the previous version.
Can you also suggest some resources on Java EE?
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Oracle Java EE Tutorial is the best for beginner. In Java EE scope. there are many frameworks,such as JSP,JSF,Servlet,Spring,Struts and so on. First you should try to focus which framework is more suitable for you and then try to learn it first.
For a beginner, Java EE can be overwhelming. Objective of the course is to give a Big Picture of the Java EE. You will understand the Jargon, Specifications, Patterns used in Java EE. You will understand the Basic Architecture of a Java EE Application.
Java EE is nothing more than an extension of Java SE meaning that it's just a bunch of extra features and packages added onto Java SE. Features such as concurrency frameworks, serverlets, websockets and a whole lot more. So in other words, no you don't need to get into all of Java EE to know Spring.
To answer the question: "Is learning Java EE still beneficial ?", yes, it absolutely is. Java EE is not in any way obsolete or on its way out and still very much relevant in enterprise software development. Part of the things that you mention are actually part of Java EE: servlets, JSP, JSF, and JPA, messaging (JMS).
Unless there is a direct need to work on a legacy system, it is perfectly fine to start with the newest version of the Java EE standard.
For starters I'd recommend free tutorials by Marty Hall, especially Configuring & Using Apache Tomcat to get you up and running.
There is also an official Java EE beginners tutorial, The Java EE 7 Tutorial. It is decently written and contains a lot of examples. By the end of it, you should have a pretty good idea where to go next.
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As Saul explained, unless you need to work on a legacy system, there is not a single reason to learn an older version of Java EE.
Every version of Java EE is a fully contained platform and doesn't require learning or knowing anything about the previous versions.
In case of 1.4, it's even better to avoid it at all cost. It contains several technologies (mainly EJB 2), that are the embodiment of bad practices. Looking at those will serve no other purpose than to cloud your mind. If possible, stay away from it.
Java EE 6 is a radical departure from the way applications were build in 1.4, and is the recommended version to start working with.
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Oracle Java EE Tutorial is the best for beginner. In Java EE scope. there are many frameworks,such as JSP,JSF,Servlet,Spring,Struts and so on.First you should try to focus which framework is more suitable for you and then try to learn it first.
In my opinion, you need to learn J2EE 1.4 before learning Java EE 5 or 6 is good because sometimes we may face to maintain legacy Java EE systems. But you have no need to maintain legacy systems then you should learn Java EE 6 first.
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