title: java.lang.IllegalArgumentException: addChild: Child name '/' is not unique
body: <h2>java.lang.IllegalArgumentException: addChild:  Child name '/' is not unique</h2>
  
  <p><em>facing this problem when replacing existing .war files by enable and disable smal single sign on  with in tomcat webapps folder</em>
  <strong>i am using apache-tomcat-7.0.53</strong></p>