Reports incorrect elements in Java Server Faces faces-config.xml files:

• References to non-instantiable classes
• References to classes that do not extend required class
• References to classes with inappropriate scope
• Empty tag and attribute values
• Tag and attribute values that do not match the required pattern (for example, Java Identifiers)
• Tags that do not include required children tags or attributes
• Tags that define objects with duplicate names

Example:

  <faces-config >
     <application>
        <action-listener>java.lang.String</action-listener>  <!-- 'java.lang.String' is not assignable to 'javax.faces.event.ActionListener'  -->
    </application>
    <navigation-rule>
        <from-view-id>myView.xhtml</from-view-id>
        <navigation-case>
            <to-view-id>unknown.xhtml</to-view-id>  <!-- Cannot resolve 'unknown.xhtml'  -->
        </navigation-case>
    </navigation-rule>
  </faces-config>