Portal Server provides supports for three application servers.application servers to be used as the web application container, in addition to the JavaTM Web Server software:
Sun Java SystemApplication Server 8.2
BEA WebLogic ServerTM Server 8.1 SP4 and 8.1 SP5
IBM WebSphere® Application Server 5.1.1.6
Running Portal Server on an application server enables you to:
Decouple the portal platform from the application server platform, allowing you to choose the best combination of Portal Server and application server for your organization
Call Enterprise JavaBeansTM architecture and other J2EETM technologies that run in the application server container
Use application server clustering, which provides scalability and high availability
Use session failover in clustering (currently available on BEA WebLogic Server andApplication Server Enterprise Edition)
Provide portlet session failover