Java – The ultimate Java version table (J2EE, Java EE, Servlet, JSP, JSTL)

jakarta-eejavajspjstlservlets

I'm looking for a component break down of Java EE (or previously know as J2EE) and Java SE

E.g.

J2EE 1.3: Servlet 2.3, JSP 1.2. JSTL 1.0, …

J2EE 1.4: Servlet 2.4, JSP 2.0, JSTL 1.1, …

Java EE 1.5: Servlet 2.5, JSP 2.1, JSTL 1.2, …

In a simple table

It can be extracted from:
http://java.sun.com/j2ee/1.3/docs/ , http://java.sun.com/j2ee/1.4/docs/ and http://java.sun.com/javaee/technologies/javaee5.jsp but I'm looking for a simple table.

Is there something like this out there? Or should I write one myself?

Best Answer

Here is one:

Also I want to add some information about Java EE7:

In Java EE 7, no changes were made to JSP and JSTL because these specifications have not been updated.

Expression Language has been removed from JSP and now has its own JSR (341).

Servlets and JSF have both been updated.

WebSocket 1.0 was introduced in Java EE 7.

And also please see this image for Java EE7:

Let me add this as well:

enter image description here

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Java – What are the differences between a HashMap and a Hashtable in Java

There are several differences between HashMap and Hashtable in Java:

Hashtable is synchronized, whereas HashMap is not. This makes HashMap better for non-threaded applications, as unsynchronized Objects typically perform better than synchronized ones.
Hashtable does not allow null keys or values. HashMap allows one null key and any number of null values.
One of HashMap's subclasses is LinkedHashMap, so in the event that you'd want predictable iteration order (which is insertion order by default), you could easily swap out the HashMap for a LinkedHashMap. This wouldn't be as easy if you were using Hashtable.

Since synchronization is not an issue for you, I'd recommend HashMap. If synchronization becomes an issue, you may also look at ConcurrentHashMap.

Java – the difference between public, protected, package-private and private in Java

The official tutorial may be of some use to you.

	Class	Package	Subclass (same pkg)	Subclass (diff pkg)	World
`public`	+	+	+	+	+
`protected`	+	+	+	+
no modifier	+	+	+
`private`	+

+ : accessible
blank : not accessible

Best Answer

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