如何确定JSP页面使用哪个Tile定义？

I'm pretty new to Java, and just encountered a strange problem. Previously, everything was working fine and I don't know what I did to screw it up (I know, everyone says that). What's happening is that I am working on a web app that uses Apache Struts (1.x) and Tiles, and when I go to a page in the web browser, it seems to be using a different Tile definition than it used to.I'm pretty new to Java, and just encountered a