I define a ".vs_main" in tiles-defs.xml. There two elements("query" and "mainbody") with a blank value. I do this because some of my pages don't have a query or a mainbody. When I deploy my project in Tomcat 5.0, everything works well. But when I deploy my project in Tomcat 5.5(jdk5.0), the page print "The requested resource (/WebVSClient/layouts/ ) is not available".
The blank.jsp is a blank file. Now it's ok. But I think this way is not well enough. I want to know why this difference accors between Tomcat5.0 and Tomcat5.5. and if there is a mechanism like placeholder in Tiles.