Beginning J2EE 1.4: From Novice to Professional (Apress by James L. Weaver

By James L. Weaver

This booklet is aimed toward programmers who've discovered the fundamentals of Java from, for instance, starting Java 1.4: From amateur to specialist, and at the moment are able to use Java within the actual international, with J2EE. yet, J2EE is a huge spec, and the objective viewers isn't attracted to company JavaBeans and different complicated specifications inside J2EE. in reality, seventy five% of J2EE purposes are outfitted utilizing in simple terms JavaServer Pages and Servlets (two of the better applied sciences to profit in J2EE), so those are the parts that the viewers is very attracted to.

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Alternatively, you can simply go to a command line prompt and type java –version at the command prompt. 0”. 0 Obtain and install the latest version of the J2SE SDK. You may want to uninstall the older version before installing the newer version. (You don’t have to, but unless you have some compelling reason to keep it around, it’s just dead weight). java –version returns the message: ‘java’ is not recognized as an internal or external command, operable program or batch file. The J2SE SDK is not installed, or the PATH environment variable does not include the path to the java executables.

Because content based on HTML, XML, etc. forms the basis of a JSP, a non-technical person can create and update that portion of a page. A more technical Java developer can create the snippets of Java code that will interface with data sources, perform calculations, and so on—the dynamic stuff. Since an executing JSP is a servlet, JSP provides the same support for session management as servlets. JSPs can also load and call methods of JavaBean components, access server-based data sources, or perform complex calculations at the server.

One example use of a message queue is an automated stock trading system. Stock prices are sent as messages to a message queue, and things that are interested in stock prices consume those messages. qxd 15/1/04 7:28 pm Page 18 Chapter 1 With message-driven EJBs, it is possible to create an EJB that responds to messages concerning stock prices and makes automatic trading decisions based on those messages. message Message-Driven EJB message Message queue message EJB Container message You will learn a lot about the ins and outs of using session and entity beans in Chapter 7.

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