plugins/org.eclipse.jst.jee.web/plugin.xml

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.2"?>
<plugin>
   <extension
        point="org.eclipse.jst.j2ee.J2EEModelProvider">
      	<provider>

        	<modelProvider factoryClass="org.eclipse.jst.jee.model.internal.Web25MergedModelProviderFactory"/>
        	<!--<modelProvider factoryClass="org.eclipse.jst.jee.model.internal.Web25ModelProviderFactory"/>-->
      		<facet id="jst.web" versions="2.5"/>
      	</provider>
   </extension>
 </plugin>