当拒绝值时，form：errors不显示错误消息

Question

the complete code is in github: https://github.com/cuipengfei/MPJSP/tree/master/tmp

in the controller, there is a method that handles the submit:

@RequestMapping(value = "/home", method = RequestMethod.POST)
    public void handleSubmit(Customer model, BindingResult result) {
        System.out.println(model.getUserName());
        result.rejectValue("userName", "required.userName", "user name invalid");
    }

and in jsp, there is a form like this:

<form:form method="POST" action="home" modelAttribute="Customer">

    <table>
        <tr>
            <td>Username :</td>
            <td><form:input path="userName" /></td>
            <td><form:errors path="userName" cssClass="error" /></td>
        </tr>
        <tr>
            <td colspan="3"><input type="submit" /></td>
        </tr>
    </table>
</form:form>

the controllers just rejects value every time, but the error message is not displayed.

the complete code can be found here: https://github.com/cuipengfei/MPJSP/tree/master/tmp

Answer 1

尝试在表单标签中设置commandName属性

<form:form method="POST" action="home" commandName="Customer">