BEA WebLogic is a complete JEE Application Server which provides many enterprise capabilities.
Vulcan requires a Servlet 1.4 compatible container. The WebLogic 9 series provides this capability.
BEA Change Request Number CR287986 affects the way web browsers display xhtml pages in Vulcan. This problem was resolved in version 9.2 MP 1.
See this page for more information.
If you are using a version prior to 9.2 MP 1, it is recommended to upgrade prior to deploying Vulcan.