Cannot find ActionMappings or ActionFormBeans collection. I just had this problem, and found a solution that was not mentioned in a quick search of this archive.
In my case, the dynamically loaded JDBC driver class was not found - because I had not included the necessary jar in the web-inf/lib directory. I found this out by systematically commenting out sections of my struts-config.xml file and testing. It was the datasource section that was causing the problem. Hope this helps, Russell Giebelhaus