The Tiles '.mainTemplate' sets up the default layout. Each page is dynamically rendered by dynamically setting the body on the derived Tiles definition. Which in this case is '.mainTemplate'.
<?xml version="1.0" encoding="ISO-8859-1" ?> <!DOCTYPE tiles-definitions PUBLIC "-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN" "http://tiles.apache.org/dtds/tiles-config_2_0.dtd"> <tiles-definitions> <!-- Default Main Template --> <definition name=".mainTemplate" template="/WEB-INF/templates/main.jsp"> <put-attribute name="title" value="Simple Tiles 2 Example" type="string" /> <put-attribute name="header" value="/WEB-INF/templates/header.jsp" /> <put-attribute name="footer" value="/WEB-INF/templates/footer.jsp" /> <put-attribute name="menu" value="/WEB-INF/templates/menu.jsp" /> <put-attribute name="content" value="/WEB-INF/templates/blank.jsp" /> </definition> </tiles-definitions>