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Developing Web Applications, Servlets, and JSPs for WebLogic Server

# Introduction and Roadmap

This section describes the contents and organization of this guide—Developing Web Applications, Servlets, and JSPs for WebLogic Server

- Document Scope and Audience
- Guide to this Document
- Related Documentation
- Examples for the Web Application Developer
- New and Changed Features in This Release

# Document Scope and Audience

This document is a resource for software developers who develop Web applications and components such as HTTP servlets and JavaServer Pages (JSPs) for deployment on WebLogic Server®. This document is also a resource for Web application users and deployers. It also contains information that is useful for business analysts and system architects who are evaluating WebLogic Server or considering the use of WebLogic Server Web applications for a particular application.

The topics in this document are relevant during the design and development phases of a software project. The document also includes topics that are useful in solving application problems that are discovered during test and pre-production phases of a project.

This document does not address production phase administration, monitoring, or performance tuning topics. For links to WebLogic Server documentation and resources for these topics, see Related Documentation.

It is assumed that the reader is familiar with J2EE and Web application concepts. This document emphasizes the value-added features provided by WebLogic Server Web applications and key information about how to use WebLogic Server features and facilities to get a Web application up and running.

# Guide to this Document

- This chapter, Introduction and Roadmap, introduces the organization of this guide.
- Understanding Web Applications, Servlets, and JSPs, provides an overview of WebLogic Server Web applications servlets, and Java Server Pages (JSPs).
- Creating and Configuring Web Applications, describes how to create and configure Web application resources.
- Creating and Configuring Servlets, describes how to create and configure servlets.
- Creating and Configuring JSPs, describes how to create and configure JSPs.
- Configuring Resources in a Web Application, describes how to configure Web application resources.
- Servlet Programming Tasks, describes how to write HTTP servlets in a WebLogic Server environment.
- Using Sessions and Session Persistence, describes how to set up sessions and session persistence.
- Application Events and Event Listener Classes, discusses application events and event listener classes.
- Filters, provides information about using filters in a Web application.
- WebLogic JSP Reference, provides reference information for writing JavaServer Pages (JSPs).
- Using WebLogic JSP Form Validation Tags, describes how to use WebLogic JSP form validation tags.
- Using Custom WebLogic JSP Tags (cache, process, repeat), describes the use of three custom JSP tags—cache, repeat, and process—provided with the WebLogic Server distribution.
- Using the WebLogic EJB to JSP Integration Tool, describes how to use the WebLogic EJB-to-JSP integration tool to create JSP tag libraries that you can use to invoke EJBs in a JavaServer Page (JSP). This document assumes at least some familiarity with both EJB and JSP.
- web.xml Deployment Descriptor Elements, describes the deployment descriptor elements defined in the `web.xml` schema under the root element `<web-app>.`
- weblogic.xml Deployment Descriptor Elements, provides a complete reference for the schema for the WebLogic Server-specific deployment descriptor weblogic.xml.
- Web Application Best Practices, contains BEA best practices for designing, developing, and deploying WebLogic Web applications and application resources.

# Related Documentation

This document contains Web application-specific design and development information.

For comprehensive guidelines for developing, deploying, and monitoring WebLogic Server applications, see the following documents:

- Developing Applications with WebLogic Server is a guide to developing WebLogic Server applications.
- Deploying Applications to WebLogic Server is the primary source of information about deploying WebLogic Server applications.
- Upgrading WebLogic Application Environments contains information about Web Applications, JSP, and Servlet compatibility with previous WebLogic Server releases.
- JavaServer Pages Tutorial from Sun Microsystems
- JSP product overview from Sun Microsystems
- JSP 2.0 Specification from Sun Microsystems
- Servlet 2.4 Specification from Sun Microsystems at http://java.sun.com/products/servlet/download.html#specs
- For more information in general about Java application development, refer to the Sun Microsystems, Inc. Java 2, Enterprise Edition Web Site at http://java.sun.com/products/j2ee/

# Examples for the Web Application Developer

In addition to this document, BEA Systems provides examples for software developers within the context of the Avitek Medical Records Application (MedRec) sample, discussed in the next section.

## Avitek Medical Records Application (MedRec)

MedRec is an end-to-end sample J2EE application shipped with WebLogic Server that simulates an independent, centralized medical record management system. The MedRec application provides a framework for patients, doctors, and administrators to manage patient data using a variety of different clients.

MedRec demonstrates WebLogic Server and J2EE features, and highlights BEA-recommended best practices. MedRec is included in the WebLogic Server distribution, and can be accessed from the Start menu on Windows machines. For Linux and other platforms, you can start MedRec from the `WL_HOME\samples\domains\medrec` directory, where `WL_HOME` is the top-level installation directory for WebLogic Platform.

## Web Application Examples in the WebLogic Server Distribution

WebLogic Server optionally installs API code examples in `WL_HOME\samples\server\examples\src\examples`, where `WL_HOME` is the top-level directory of your WebLogic Server installation. You can start the examples server, and obtain information about the samples and how to run them from the WebLogic Server Start menu.

BEA provides several Web application, servlet, and JSP examples with this release of WebLogic Server. BEA recommends that you run these Web application examples before developing your own Web applications.

# New and Changed Features in This Release

For this manual, there are no significant new or changed features for version 9.1 of WebLogic Server. If you are not familiar with the new features provided in version 9.0 of WebLogic Server, see the What's New in WebLogic Server 9.0 section of the WebLogic Server Release Notes.