This figure shows a dynamic discovery cluster with four 10.1.3.2.0 middle tiers. The first middle tier contains Oracle HTTP Server. The second middle tier contains the following OC4J instances:

• home

  This OC4J instance contains Application Server Control.

• OC4J_Apps

  This is a custom OC4J instance for running WebCenter applications. It connects to a shared Oracle Metadata Services directory and a shared LDAP server.

The third middle tier contains the following OC4J instance:

• OC4J_Apps

  This is a custom OC4J instance for running WebCenter applications. It connects to a shared Oracle Metadata Services directory and a shared LDAP server.

The fourth middle tier contains the following OC4J instance:

• OC4J_WebCenter

  This OC4J instance contains the portlet container and portlet producers.

Oracle HTTP Server communicates with the OC4J instances using AJP.