To use the Common class loader, copy the JAR files into the domain-dir/lib directory or copy the .class files into the domain-dir/lib/classes directory, then restart the server.
Using the Common class loader makes an application or module accessible to all applications or modules deployed on servers that share the same configuration.
For example, using the Common class loader is the recommended way of adding JDBC drivers to the Enterprise Server. For a list of the JDBC drivers currently supported by the Enterprise Server, see the Sun GlassFish Enterprise Server 2.1 Release Notes. For configurations of supported and other drivers, see Configurations for Specific JDBC Drivers in Sun GlassFish Enterprise Server 2.1 Administration Guide.