Deployment is necessary for application clients that communicate with EJB components or that use Java Web Start launch support.
Java Web Start is supported for application clients and for applications that contain application clients. It is enabled by default both in application clients and in the Application Server.
This section contains the following topics:
Assemble the necessary client files.
Assemble the EJB components to be accessed by the client.
Package the client and EJB components together in an application.
Deploy the application as described in Tools for Deployment.
If you are using the appclient script to run the application client, retrieve the client JAR file.
You can use the --retrieve option to get the client JAR file.
You can also use the asadmin get-client-stubs command to retrieve the stubs and ties whether or not you requested their generation during deployment. For details, see the Sun Java System Application Server 9.1 Reference Manual.
If you are using the appclient script to run the application client, copy the client JAR file to the client machine.
You can execute the client on the Application Server machine to test it in one of the following ways:
If Java Web Start is enabled for the application client, use the Launch link on the Application Client Modules page to launch the application client using Java Web Start.
You can also use the appclient script in the as-install/bin directory to run an application client. If you are using the default server instance, the only required option is -client, which points to the client JAR file. For example:
appclient -client converterClient.jar
The -xml parameter, which specifies the location of the sun-acc.xml file, is also required if you are not using the default instance.
For more detailed information about Java Web Start, see Chapter 11, Developing Java Clients, in Sun Java System Application Server 9.1 Developer’s Guide.
For more detailed information about the appclient script, see the Sun Java System Application Server 9.1 Reference Manual.
If Java Web Start is enabled, the default URL for an application is as follows:
The default URL for a stand-alone application client module is as follows:
If the context-root or module-id is not specified during deployment, the name of the EAR or JAR file without the extension is used. For an application, the relative path to the application client JAR file is also included. If the application or module is not in EAR or JAR file format, a context-root or module-id is generated.
Regardless of how the context-root or module-id is determined, it is written to the server log. For details about naming, see Naming Standards.
To set a different URL for an application client, use the context-root subelement of the java-web-start-access element in the sun-application-client.xml file.
If Java Web Start is not enabled for the application client, follow these steps.
Copy the ACC package JAR file to the client machine and unjar it.
This file is located in the appclient/appserv/lib/appclient directory by default if you used the package-appclient script.
This file is located in appclient/appserv/bin by default if you used the package-appclient script.
Copy the client JAR file to the client machine.
You are now ready to execute the client.
For more detailed information about Java Web Start and the package-appclient script, see Chapter 11, Developing Java Clients, in Sun Java System Application Server 9.1 Developer’s Guide.
Once application clients are downloaded, they remain on the client until removed manually. The Java Web Start control panel provides a simple interface you can use to discard downloaded application clients that used Java Web Start. When you undeploy an application client, you can no longer use Java Web Start, or any other mechanism, to download the application client. If you try to launch an application client that was previously downloaded even though the server side of the application client is no longer present, the results depend on whether the application client has been written to tolerate such situations.
You can write your application client to detect failures in contacting server-side components and to continue running anyway. In this case, Java Web Start can run an undeployed application client as it is cached locally. For example, your application client can be written to catch and recover from a javax.naming.NamingException in locating a resource or a java.rmi.RemoteException in referring to a previously-located resource that becomes inaccessible.