code: public void setType(String type) throws ExpressionException {
  	type = type.toLowerCase().trim();
  	if (type.equals("exception")) {
  	    errorPage.setType(ErrorPage.TYPE_EXCEPTION);
  	}
  	else if (type.equals("request")) {
  	    errorPage.setType(ErrorPage.TYPE_REQUEST);
  	}
  	// else if(type.equals("validation")) this.type=VALIDATION;
  	else throw new ExpressionException("invalid type [" + type + "] for tag error, use one of the following types [exception,request]");
      }
docs: set the value type The type of error that the custom error page handles.
  
  @param type value to set
  @throws ExpressionException