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

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.2"?>
<plugin>
   <extension point="org.eclipse.wst.common.project.facet.core.facets">

    <project-facet-version facet="jst.web" version="2.5">
      <constraint>
        <and>
          <requires facet="jst.java" version="[1.3"/>
          <conflicts group="modules"/>
        </and>
      </constraint>
      <group-member id="modules"/>
     <action type="INSTALL" id="jst.web#2.5#install">
      <delegate class="org.eclipse.jst.jee.web.project.facet.WebFacetInstallDelegate"/>
      <config-factory class="org.eclipse.jst.jee.web.project.facet.WebFacetInstallDataModelProvider"/>
    </action>

   
    <event-handler type="POST_INSTALL" >
      <delegate class="org.eclipse.jst.jee.web.project.facet.WebFacetPostInstallDelegate"/>
    </event-handler>
    </project-facet-version>
    
   
<!-- lets comment it for now
 <event-handler facet="jst.web" version="2.5" type="RUNTIME_CHANGED">
      <delegate class="org.eclipse.jst.jee.web.project.facet.WebFacetRuntimeChangedDelegate"/>
    </event-handler>
  -->  
    

   </extension>
</plugin>