After you create a cluster, you can assign other J2EE Agents to it. A cluster uses any shared settings you have specified for the primary cluster server.
In the Administration Console, click> .
On the Servers page, select the server’s check box, then choose.
To select all the servers in the list, select the top-level Server check box.
Select the configuration’s check box, then click.
The status icon for the J2EE Agent should turn green. It might take several seconds for the J2EE Agent to start and for the system to display the green status.