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POSpring MVC 3 Form Validator not displaying Error message in .jsp
 

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  1. POSpring MVC 3 Form Validator not displaying Error message in .jsp
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    <p>I entered in <strong>Spring Web MVC Framework</strong> not long ago thus I am a complete beginner. Right now I am implementing a basic <strong>form</strong> for my first <strong>web application</strong>.</p> <p>In the same time I would like to say that I've been seeking a solution for my problem for whole day. I apolgize in advance if the solution for similar problem was already published.</p> <p>Source code:</p> <p><em>spring-servlet.xml</em> </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="si.src.controllers" /&gt; &lt;context:component-scan base-package="si.src.validators" /&gt; &lt;bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver"&gt; &lt;property name="viewClass"&gt; &lt;value&gt;org.springframework.web.servlet.view.JstlView&lt;/value&gt; &lt;/property&gt; &lt;property name="prefix"&gt; &lt;value&gt;/WEB-INF/jsp/&lt;/value&gt; &lt;/property&gt; &lt;property name="suffix"&gt; &lt;value&gt;.jsp&lt;/value&gt; &lt;/property&gt; &lt;/bean&gt; &lt;/beans&gt; </code></pre> <hr> <p><em>index.jsp</em></p> <pre><code>&lt;!-- language: lang-jsp --&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;Spring 3.0 MVC Series - Index&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;br&gt; &lt;div align='center'&gt; &lt;p&gt; &lt;h1&gt;Example - Spring Application&lt;/h1&gt; The "index.jsp" is the entry point for our application. This is my first test. Work! &lt;p&gt; &lt;a href="login.html"&gt;Welcome! Click Here to Login&lt;/a&gt; &lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <hr> <p><em>login.jsp</em></p> <pre class="lang-jsp prettyprint-override"><code>&lt;%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %&gt; &lt;%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %&gt; &lt;%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;Spring Sample - Login Page&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;h3&gt;Login Page&lt;/h3&gt;&lt;br&gt; &lt;form:form id="form" method="post" commandName="loginForm"&gt; &lt;form:errors path="*" cssClass="errorblock" element="div" /&gt; &lt;table&gt; &lt;tr&gt; &lt;td&gt;&lt;form:label path="username"&gt;Username&lt;/form:label&gt;&lt;/td&gt; &lt;td&gt;&lt;form:input path="username" /&gt;&lt;/td&gt; &lt;td&gt;&lt;form:errors path="username" cssClass="error"/&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;&lt;form:label path="username"&gt;Password&lt;/form:label&gt;&lt;/td&gt; &lt;td&gt;&lt;form:input path="password" /&gt;&lt;/td&gt; &lt;td&gt;&lt;form:errors path="password" cssClass="error"/&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td colspan="2"&gt;&lt;input type="submit" value="Sign in" /&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/form:form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <hr> <p><em>LoginFormController.java</em></p> <pre class="lang-java prettyprint-override"><code>package si.src.controllers; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.stereotype.Controller; import org.springframework.validation.BindException; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.servlet.mvc.SimpleFormController; import org.springframework.web.servlet.ModelAndView; import si.src.logic.Login; import si.src.validators.LoginValidator; @Controller @RequestMapping(value="/login") public class LoginFormController extends SimpleFormController{ public LoginFormController(){ setCommandClass(Login.class); //Form's values will store into the Login object setCommandName("loginForm"); //If HTML form action value with named "loginForm" is sumbitted, Spring will forward request to this form controller } @RequestMapping(method=RequestMethod.POST) protected ModelAndView onSubmit(HttpServletRequest request, HttpServletResponse response, Object command, BindException errors) throws Exception{ LoginValidator validator = new LoginValidator(); Login userLogin = (Login) command; validator.validate(userLogin, errors.getBindingResult()); if(errors.hasErrors()){ userLogin.setUsername(""); userLogin.setPassword(""); System.out.println("Ne"); return new ModelAndView("login","loginForm", userLogin); } else{ System.out.println(userLogin); System.out.println(userLogin.getUsername() + " " + userLogin.getPassword()); return new ModelAndView("success","userLogin", userLogin); } } protected Object formBackingObject(HttpServletRequest request) throws Exception { //Initialize the values in the form. Not necessary Login userLogin = new Login(); userLogin.setUsername("Admin"); return userLogin; } } </code></pre> <hr> <p><em>LoginValidator.java</em></p> <pre><code>package si.src.validators; import org.springframework.validation.Errors; import org.springframework.validation.Validator; import org.springframework.validation.ValidationUtils; import si.src.logic.Login; public class LoginValidator implements Validator{ public boolean supports(Class aClass) { //just validate the Login instances return Login.class.isAssignableFrom(aClass); } public void validate(Object obj, Errors errors) { Login login = (Login) obj; ValidationUtils.rejectIfEmptyOrWhitespace(errors, "username","required-username", "Enter username"); ValidationUtils.rejectIfEmptyOrWhitespace(errors, "password","required-password", "Enter password"); } } </code></pre> <hr> <p><em>Login.java</em></p> <pre class="lang-java prettyprint-override"><code>package si.src.logic; public class Login { private String username; private String password; public Login(){} public void setUsername(String username){ this.username=username; } public String getUsername(){ return username; } public void setPassword(String password){ this.password=password; } public String getPassword(){ return password; } } </code></pre> <hr> <p>I suppose the error messages obtained by <strong>LoginValidator</strong> object are not correctly "binded" with my <strong>login.jsp</strong> file. I guess that is the reason why the <strong>error messages</strong> i.e <em>"Enter username"</em> and <em>"Enter password"</em> don't show up when my form is poorly fulfilled.</p> <p>My question is: Why the error messages are not showing up in a login.jsp?</p>
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