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EJB QL has a few restrictions: Comments are not allowed A date or Date and time values are in milliseconds and use a Java time literal should be an integer literal To generate a millisecond value, you may use the class Currently, container-managed persistence does not support inheritance For this reason, two entity beans of different types cannot be compared
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clause cannot specify a collection-valued expression For example, the clause is invalid because is a collection However, the clause in the following query is valid because the is a single element of collection:
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The entity bean, for example, implements the method, which returns a collection of objects for The persistent field of the entity bean See Example 11 (page 172)
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WHEN a Web client such as a browser communicates with a J2EE application, it does so through server-side objects called Web components There are two types of Web components: Java Servlets and JavaServer Pages (JSP ) pages Servlets are Java programming language classes that dynamically process requests and construct responses JSP pages are text-based documents that execute as servlets but allow a more natural approach to creating static content Although servlets and JSP pages can be used interchangeably, each has its own strengths Servlets are best suited to managing the control functions of an application, such as dispatching requests, and handling nontextual data JSP pages are more appropriate for generating text-based markup such as HTML, SVG, WML, and XML This chapter describes the packaging, configuration, and deployment procedures for Web clients s 10 and 11, cover how to develop the Web components Many features of JSP technology are determined by Java Servlet technology, so you should familiarize yourself with that material even if you do not intend to write servlets Most J2EE Web clients use the HTTP protocol and support for HTTP is a major aspect of Web components For a brief summary of HTTP protocol features, see Appendix A
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WEB CLIENTS AND COMPONENTS
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Web Client Life Cycle 194 Web Application Archives 196 Creating a WAR File 197 Adding a WAR File to an EAR File 198 Adding a Web Component to a WAR File 198 Configuring Web Clients 200 Application-Level Configuration 200 WAR-Level Configuration 200 Component-Level Configuration 202 Deploying Web Clients 203 Running Web Clients 204 Updating Web Clients 204 Internationalizing Web Clients 206
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The server-side portion of a Web client consists of Web components, static resource files such as images, and helper classes and libraries The J2EE platform provides many supporting services that enhance the capabilities of Web components and make them easier to develop However, because it must take these services into account, the process for creating and running a Web client is different from that of traditional stand-alone Java classes Web components run within an environment called a Web container The Web container provides services such as request dispatching, security, concurrency, and life-cycle management It also gives Web components access to the J2EE platform APIs such as naming, transactions, and e-mail Before it can be executed, a Web client must be packaged into a Web application archive (WAR), which is a JAR similar to the package used for Java class libraries, and installed (or deployed) into a Web container Certain aspects of Web client behavior can be configured when it is deployed The configuration information is maintained in a text file in XML format called a Web application deployment descriptor When you create Web clients and components using the J2EE SDK utility, it automatically generates or updates the deployment descriptor based on data that you enter in wizards and inspectors You can also manually create a deployment descriptor according to the schema described in the Java Servlet specification