Issue
I'm using validation-api-1.1.0.Final.jar to valid form input in Spring 4 MVC. But I'm stuck in here, the result.hasErrors() seems always false(it means @Valid doesn't work properly). I followed this guideValidating Form Input, but that guide validating form input using Spring Boot. I'm using Tomcat 8 instead of using Spring Boot. I've search a lot about this, but the issue still existed. Seaking for help. Thanks!
Project Structure:
UserController.java
package com.ro.user.controller;
import com.ro.user.model.UserModel;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import javax.validation.Valid;
@Controller
public class UserController {
@RequestMapping(value = "/user", method = RequestMethod.GET)
public UserModel user(Model model) {
UserModel userModel = new UserModel();
model.addAttribute("userModel", userModel);
return userModel;
}
@RequestMapping(value = "/userLogin", method = RequestMethod.POST)
public String userLogin(@Valid @ModelAttribute("userModel") UserModel userModel, BindingResult bindingResult) {
System.out.println("Before: bindingResult.hasErrors()");
if (bindingResult.hasErrors()) {
System.out.println("After: bindingResult.hasErrors()");
return "user";
}
return "result";
}
}
UserModel.java
package com.ro.user.model;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
public class UserModel {
@NotNull
@Size(min = 6, max = 12)
private String username;
@Size(min = 8, max = 16)
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
user.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %>
<html>
<head>
<title>Spring MVC Form Handling</title>
<style>
.error {
color: #ff0000;
}
.errorblock {
color: #000;
background-color: #ffEEEE;
border: 3px solid #ff0000;
padding: 8px;
margin: 16px;
}
</style>
</head>
<body>
<h2>User Information</h2>
<form:form action="userLogin" modelAttribute="userModel" method="POST">
<form:errors path="*" cssClass="errorblock" element="div"/>
<table>
<tr>
<td><form:label path="username">Username:</form:label></td>
<td><form:input path="username"/></td>
<td><form:errors path="username" cssClass="error"/></td>
</tr>
<tr>
<td><form:label path="password">Password:</form:label></td>
<td><form:input path="password"/></td>
<td><form:errors path="username" cssClass="error"/></td>
</tr>
<tr>
<td colspan="3">
<input type="submit" value="Submit"/>
</td>
</tr>
</table>
</form:form>
</body>
</html>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>UserLogin</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>UserLogin</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
UserLogin-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<mvc:annotation-driven/>
<context:component-scan base-package="com.ro.user.controller"/>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
<bean class="org.springframework.context.support.ResourceBundleMessageSource" id="messageSource">
<property name="basename" value="com.ro.user.model.error"/>
</bean>
</beans>
Solution
This issue is caused by lack of the dependency of Hibernate Validator. It is supposed to add all Jars in a folder named required to project's lib(download zip from the official website and unzip it, you will see this folder). Not just the hibernate-validator.jar and validation-api.jar.
Answered By - Raphael Xue
