When you install a J2EE library using the install assistant, you specify the servers and clusters to which the library is targeted. You can, however, change these targets after the library has been installed, as described in the following procedure.
Libraryentry in the Type column.
If you have clusters configured for your domain, a Clusters box will also appear on the page. In this box, click the clusters to which you want to target the library. For each cluster, you can choose to target the application to all servers in the cluster, or just to a selected few.
Be sure you target the J2EE library to each server and cluster to which modules and applications that use the library are deployed.