To share libraries across a specific cluster, copy the JAR files to the domain-dir/config/cluster-config-name/lib directory. Then add the path to the JAR files to the System class loader as explained in Using the System Class Loader or to the Shared Chain class loader as explained in Table 2–1.
Some topics in the documentation pertain to features that are available only in domains that are configured to support clusters. Examples of domains that support clusters are domains that are created with the cluster profile or the enterprise profile. For information about profiles, see Usage Profiles in Sun GlassFish Enterprise Server 2.1 Administration Guide.