code: public EmbeddedTomcat setContextPath(String contextPath) {
  
  		if (contextPath == null
  				|| !contextPath.equals("") && !contextPath.startsWith("/")) {
  			throw new IllegalArgumentException(
  					"contextPath must be the empty string \"\" or a path starting with /");
  		}
  
  		this.contextPath = contextPath;
  		return this;
  	}
docs: Sets the contextPath for the webapplication
  
  @param contextPath The new contextPath. Has to start with / or is the empty ""
  string
  @return The embedded Tomcat