docs: public static URL locateContextConfig(String webappRootContext, String userSpecifiedContextLocation, URL defaultLocation) {
  
          // Assertions.
          if (webappRootContext == null) {
              String msg = "Argument 'webappRootContext' cannot be null.";
              throw new IllegalArgumentException(msg);
          }
          // NB:  Both 'userSpecifiedContextLocation' & 'defaultLocation' may be null
          
          URL rslt = null;
          if (userSpecifiedContextLocation != null) {
              
              /*
               * SPECIAL HANDLING:  We remove a leaving slash ('/') here because, when 
               * no protocol is specified, the expectation is that the path is 
               * evaluated from the root of the webapp ('webappRootContext').  If we 
               * didn't, the ResourceHelper would incorrectly interpret these as the 
               * root of the protocol, which is likely 'file:/' or 'jndi:/'. 
               */
              if (userSpecifiedContextLocation.startsWith("/")) {
                  userSpecifiedContextLocation = userSpecifiedContextLocation.substring(1);
              }
              
              rslt = ResourceHelper.evaluate(webappRootContext, userSpecifiedContextLocation);
  
          } else {
              rslt = defaultLocation;  // may be null...
          }
          
          return rslt;
  
      }