Application client projects contain the resources needed for application client modules. An application client module is used to contain a full-function client Java™ application (non Web-based) that connects to and uses the J2EE resources defined in your server. When you place the client code in an application client module instead of a simple JAR file, the application client benefits from the server's resources (it does not need to re-specify the class path to J2EE and server JAR files) as well as from easier JNDI lookup (the client container fills in the initial context and other parameters). The application client project allows you to work as if you are creating a standalone Java application in a Java project.
An application client project enables you to do the following things:
• Develop the Java classes that implement the client module
• Set the application client deployment descriptor
• Test the application client
Like Java projects, application client projects contain the resources needed for application clients, including Java files and class files. When you create a new application client project, the environment is set up for Java development. A Java builder is associated with the project so the Java source can be incrementally compiled as it is updated. The application client project contains information about the type hierarchy and Java elements. This information is kept current as changes are made, and the Java builder will incrementally compile the resources within these projects as the resources are updated.
An application client project is deployed as a JAR file. This application client JAR file contains all of the class files that a client program needs to use the enterprise beans that are contained in a client module, along with the deployment descriptor and any meta-data extensions and bindings files.Application client projects are typically run on networked client systems connected to J2EE (EJB) servers. The point of entry for the application client is a Java main-class, which is simply a Java class that contains a static main method. The class is declared in the manifest file of the client module.
A J2EE application client container provides access to the J2EE service (JNDI naming services, deployment services, transaction services, and security services) and communications APIs (internet protocols, Remote Method Invocation protocols, Object Management Group protocols, Messaging protocols, and data formats).
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