Use naming

 

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Overview

Naming is used by clients of WebSphere Application Server applications most commonly to obtain references to objects related to those applications, such as EJB homes. The following steps outline the context of Naming in the overall application development and deployment process. Steps for this task follow:

1. Develop application using either JNDI or CosNaming (CORBA) interfaces.

   Use these interfaces to look up server application objects that are bound into the name space and obtain references to them. Most Java developers use the JNDI interface. However, the CORBA CosNaming interface is also available for performing Naming operations on WAS name servers or other CosNaming name servers.

2. Assemble applications

   If the application is a client to an application running in another process, qualify the jndiName values in the deployment descriptors for the objects related to the other application. Otherwise, you may need to override the names with qualified names during application deployment. If the objects have fixed qualified names configured for them, use them so that the jndiName values do not depend on the other application's location within the topology of the cell.

3. Deploy applications

   Put assembled applications onto the appserver. If the application you are assembling is a client to an application running in another server process, be sure to qualify the jndiName values for the other application's server objects if they are not already qualified.

4. Configure name space bindings.

   This step is necessary in these cases:

   • Your deployed application is to be accessed by legacy client applications running on previous versions of WAS. In this case, configure additional name bindings for application objects relative to the default initial context for legacy clients. (V5 clients have a different initial context from legacy clients.)

   • The application requires qualified name bindings for such reasons as:

     • It will be accessed by J2EE client applications or server applications running in another server process.

     • It will be accessed by thin client applications.

     In this case, you can configure name bindings as additional bindings for application objects. The qualified names for the configured bindings are fixed, meaning they do not contain elements of the cell topology that can change if the application is moved to another server. Objects as bound into the name space by the system can always be qualified with a topology-based name. You must explicitly configure a name binding to use as a fixed qualified name.

5. Troubleshoot any problems that develop.

   If a Naming operation is failing and you need to verify whether certain name bindings exist, use the dumpNameSpace tool to generate a dump of the name space.

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Name space federation
Name space bindings

V5 features for name space support
Lookup names support in deployment descriptors and thin clients
JNDI support in WebSphere Application Server
Naming and directories: Resources for learning

 

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