What servlet engines support clustering -- that is, sharing of session data across multiple load-balanced web servers?
If you know any more, please submit feedback. -Alex]
JRun 3.0 (Right now in RC1) will support clustering with an add-on. check http://www.allaire.com for info.
[Prasad Thammineni adds:]
In WebSphere Application Server Advanced Edition, you have to enable persistent sessions in order to support session clustering. Also, you have to employ a load balancer like CISCO local director to distribute HTTP requests across multiple web servers/servlet engines.
[victor tago (firstname.lastname@example.org) adds: ]
The WebSphere Performance Pack also has a load balancer called Secureway Network Dispatcher.
WebLogic server has supported robust clustering of servlets, EJBs, etc. for over a year!