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POSpring 3 MVC: Show validation message with custom validator
 

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    <p>I need help. I am beginner in jsp, MVC. I want to validate form input with custom validator in Spring 3 MVC.</p> <p>My validator class </p> <pre><code> package validators; import models.UserModel; import org.springframework.stereotype.Component; import org.springframework.validation.Errors; import org.springframework.validation.ValidationUtils; import org.springframework.validation.Validator; @Component public class UserValidator implements Validator { @Override public boolean supports(Class clazz) { return UserModel.class.isAssignableFrom(clazz); } @Override public void validate(Object target, Errors errors) { ValidationUtils.rejectIfEmptyOrWhitespace(errors, "firstname", "Enter firstname."); ValidationUtils.rejectIfEmptyOrWhitespace(errors, "surname", "Enter surname."); ValidationUtils.rejectIfEmptyOrWhitespace(errors, "login", "Enter login."); } } </code></pre> <p>Controller class</p> <pre><code>package controllers; import java.util.ArrayList; import models.UserModel; import org.springframework.stereotype.Controller; 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 org.springframework.web.servlet.ModelAndView; import validators.UserValidator; import database.UserDB; @Controller public class UserController { @RequestMapping(value="pouzivatel/new", method=RequestMethod.POST) public ModelAndView newUser(@ModelAttribute UserModel user, BindingResult result){ UserValidator validator = new UserValidator(); validator.validate(user, result); if(result.hasErrors()){ return new ModelAndView("/user/new","command",user); } ... } </code></pre> <p>Model for User</p> <pre><code>package models; public class UserModel { private String firstname=""; private String surname=""; public String getFirstname() { return firstname; } public String getSurname() { return surname; } public void setFirstname(String firstname) { this.firstname = firstname; } public void setSurname(String surname) { this.surname = surname; } } </code></pre> <p>JSP veiw new.jsp which is in directory /web-inf/user (it just only form)</p> <pre><code>&lt;form:form method="post" action="new.html"&gt; &lt;fieldset&gt; &lt;table&gt; &lt;tr&gt; &lt;td&gt; &lt;form:label path="firstname"&gt;FirstName&lt;/form:label&gt; &lt;/td&gt; &lt;td&gt; &lt;form:input path="firstname" /&gt; &lt;form:errors path="firstname" /&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt; &lt;form:label path="surname"&gt;Surname&lt;/form:label&gt; &lt;/td&gt; &lt;td&gt; &lt;form:input path="surname" /&gt; &lt;form:errors path="surname" /&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/fieldset&gt; &lt;div&gt; &lt;button type="submit" id="btOk"&gt;Ok&lt;/button&gt; &lt;/div&gt; &lt;/form:form&gt; </code></pre> <p>dispatcher servlet.xml</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"&gt; &lt;context:component-scan base-package="controllers" /&gt; &lt;context:component-scan base-package="validators" /&gt; &lt;bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver"&gt; &lt;property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /&gt; &lt;property name="prefix" value="/WEB-INF/jsp/" /&gt; &lt;property name="suffix" value=".jsp" /&gt; &lt;/bean&gt; &lt;/beans&gt; </code></pre> <p>Problem is a display validation message in view. Validation is successful and in variable resut (BindingResult) are errors. Controller return follow part of code</p> <pre><code>if(result.hasErrors()){ return new ModelAndView("/user/new","command",user); </code></pre> <p>Another way is use Annotation validation (I preffer custom validator), but why i can not see validation messages on view, when input fields are empty.</p> <p>Can you give me example how to do it right?</p> <p>Thanks for reply.</p>
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