Here's all you have to know for integrating Spring/Hibernate/... with Websphere: www.ibm.com/.../0609_alcott.html

Btw websphere  is not worth trying. tomcat  is just great, and with MuleSource's TCat server  or SpringSource's server product it's got great management features too. But if you need some features that tomcat doesn't provide or you have to integrate third party libraries to add those missing features to tomcat and it's more headache then trying Weblogic makes sense. Websphere is only good if you are forced to use it because you're in an IBM shop.