Custom JSP taglib. This taglib lets you use something similar to global-forwards in Struts. The main idea is very simple. Instead of using the hard coded strings for pages in jsp:forward and jsp:include tags you can use the similar tags from this taglib where the page will be defined as a global (context) parameter for your web application. For example, in your web.xml file you can define a context parameter error:
 

Try It Out: http://www.servletsuite.com/servlets/globtag.htm