Download PDF by Weaver: Beginning J2EE 1.4. From Novice to Pro

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The J2EE platform provides a number of services beyond the component hosting of servlets, JSPs, and EJBs. Fundamental services include support for XML, web services, transactions, and security. Extensive support for XML is a core component of J2EE. Support for both document-based and stream-based parsing of XML documents forms the foundation of XML support. Additional APIs provide XML registry service, remote procedure call invocation via XML, and XML-based messaging support. Web services, which rely heavily on XML, provide support for describing, registering, finding, and invoking object services over the Web.

When testing the JSP, the web browser reports “Page cannot be displayed” when trying to open the URL http://localhost:8080. Make certain that there weren’t any errors reported when starting the J2EE server. Make certain that you’ve specified the port“8080” in the URL (this is the default port used by the J2EE server). When testing the JSP, it reports a compilation error in the web browser. jsp. If you’ve mistyped something, the server won’t be able to compile the JSP. The message in the web browser should give you a hint where to look.

Session beans, like the name implies, live only as long as the conversation or “session” between the client application and the bean lasts. The session bean’s primary reason for being is to provide application services, defined and designed by the application developer, to client applications. Depending on the design, a session bean may maintain state during the session (that is, it keeps its internal member variables’ values so it can maintain sort of a conversation with the client), or it may be “stateless,” meaning that it provides business rules through its exposed operations but doesn’t provide any sense of “state”—that responsibility is delegated to the client.

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