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# J2EE Library: Targets

Related Tasks Related Topics

Use this page to select the WebLogic Server instances and clusters to which you want to deploy (target) the J2EE library.

The J2EE library feature in WebLogic Server 9.0 provides an easy way to share one or more types of J2EE modules among multiple Enterprise Applications.

In particular, a J2EE library is a standalone EJB or Web Application module, multiple EJB or Web Application modules packaged in an Enterprise Application (EAR), or a single plain JAR file that is registered with the J2EE application container upon deployment.

After the library has been registered, you can deploy Enterprise Applications that reference the library. Each referencing application receives a reference to the required library module(s) on deployment, and can use those modules as if they were packaged as part of the referencing application itself. The shared library classes are added to the classpath of the referencing application, and the referencing application's deployment descriptors are merged (in memory) with those of the J2EE library modules.

The name of the J2EE library is always followed by a version number of the form `(Specification@Implementation)`, where `Specification` identifies the version number of the specificaiton (for example, the J2EE specification number) to which a library or package conforms and `Implementation` identifies the version number of the actual actual code implementation for the library or package. This versioning of J2EE libraries enables referencing applications to specify a required minimum version of the library to use, or an exact, required version.

Related Tasks

- Install a J2EE library
- Target a J2EE library to a server or cluster
- Configure a J2EE library
- Update (redeploy) a J2EE library
- Delete a J2EE library

Related Topics

- Creating Shared J2EE Libraries and Optional Packages
- Developing Applications with WebLogic Server