code: public B withContextPath(String contextPath) {
          assertNotNull(contextPath, "contextPath  could not be null.");
          getConfig().setContextPath(contextPath);
  
          return self();
      }
docs: Specifies the context to use to deploy the web application. An empty
  string or <tt>/</tt> means the root context.
  
  @param contextPath the context path to use
  @return this