J2EE : Java Glossary

by Roedy Green ©1996-2008 Canadian Mind Products
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J2EE

Java2 Platform, Enterprise Edition. A bundling of Sun’s enterprise APIs including: Enterprise Java Beans components, Java Servlets API and JavaServer Pages. You can download the lot. The J2EE spec is better specified than the original EJB spec and has a conformance suite.

The idea is other vendors can implement the same interfaces for higher performance.

Caveats	Books
Components	Links
Pick and Choose

Caveats

J2EE is a set of APIs for dozens of different purposes. In any one project, you would likely only use a smattering of them. Then you have to go out and buy implementations of the APIs you need, or if you are lucky, find free ones that are decent. You then have to integrate all this stuff from vendors who have never met. You then ask a lot of questions on the newsgroups of about mixing A with B since neither vendor A nor B will acknowledge the other’s existence — not unlike the fun you have with JDBC, SQL and Servlets.

You definitely want to get the JSE stuff under your belt before tackling the enterprise APIs.

Here is a suggested learning order: JDK, JavaMail, Servlets, JNDI, JSP, JDBC, JAAS, RMI, JAXP, JMS, EJB.

Components

J2EE contain the following pieces:

Components of J2EE
Acronym	What It Is For
Connector Architecture	It is a scheme for tying together heterogeneous application servers.
ECPerf	An application for suppliers and vendors.
EJB	Enterprise Java Beans
ENC	Enterprise Naming Context. Using JNDI and ENC you can link a logical database connection to a physical database connection without writing code, just using configuration files.
JAAS	Java Authentication and Authorization Service (now part of J2SE JDK).
JACC	Java Authorization Contract for Containers
JAF	Javabeans Activation Framework. Deal with MIME and content types
JavaMail	For sending and receiving email.
JAXP	Java API for XML Processing.
JAXR	Java API for XML Registries
JAX-RPC	Java API for XML-based Remote Procedure Call
JDBC	Java Database Connectivity
JDK	Java Development Kit
JMS	Java Messaging System
JMX	Java Management Extensions
JNDI	Java Naming and Directory Interface
JSP	Java Server Pages: JSPs allow for the definition of output HTML pages with Java code and JSP tags interspersed. There are libraries of custom tags for JSP that allow you to avoid placing any actual Java code in the pages. JSPs are typically used as the view part of an MVC set up. JSPs are also suitable for quick and dirty prototyping or demos. Many applications only require the web technology (Servlet/JSP) portion of J2EE and some servers supply only that. The most prominent example of this is Tomcat. Note that the web container is considerably less strict than the EJB container.
JTA	Java Transaction Application Programming Interface
JTS	Java Transaction Service
RMI/IIOP	Remote Method Invocation/Internet Inter-Orb Protocol
Servlets	Servlets are Java’s answer to CGI. Servlets are typically used as the controller portion of a MVC (model view controller) set up.

Pick and Choose

Overall, many people find J2EE too big and unwieldy for their needs. Others have pared it down to use only the portions they find useful. The biggest benefit of living inside a J2EE server is that all the server technologies are implemented for you. So much of the concerns about security and scalability are taken off the table. If a particular J2EE server does not perform well for your application, you can try another.

J2EE is not an all-purpose server environment, however. It was really designed and is primarily used for web applications where the EJB layer provides support to the web layer.

Books

recommend book⇒Expert One-on-One J2EE Development without EJB

paperback

ISBN10:

0-7645-5831-5

ISBN13:

978-0-7645-5831-3

publisher:

Wrox

published:

2004-06-21

by:

Rod Johnson, Juergen Hoeller

Highly recommended. Not expensive.

	amazon.ca	amazon.com
	chapters.indigo.ca	powells.com
	amazon.fr	barnesandnoble.com
	amazon.de	amazon.co.uk

recommend book⇒Building Java Enterprise Applications Volume I: Architecture

paperback

ISBN10:

0-596-00123-1

ISBN13:

978-0-596-00123-0

publisher:

O’Reilly

published:

2002-03

by:

Brett McLaughlin

Aimed at experienced developers. Filled with particularly good advice on using EJBs and LDAP directory services Highly recommended. First volume of a three volume set on J2EE.

	amazon.ca	amazon.com
	chapters.indigo.ca	powells.com
	amazon.fr	barnesandnoble.com
	amazon.de	O’Reilly Safari
	amazon.co.uk

recommend book⇒Developing Enterprise Java Applications with J2EE and UML

paperback

ISBN10:

0-201-73829-5

ISBN13:

978-0-201-73829-2

publisher:

Addison-Wesley

published:

2001-10-27

by:

Khawar Zaman Ahmed, Cary E. Umrysh

	amazon.ca	amazon.com
	chapters.indigo.ca	powells.com
	amazon.fr	barnesandnoble.com
	amazon.de	amazon.co.uk

EJB
Free on-line course
GlassFish
J2EEBrain: programmer’s information website
J2EEWorld
J2SE
Jave ME
JSE
JSP
JWSDP (J2EE goodies download)
servlet
Sun’s J2EE Tutorial

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