Not getting the validation message in my example.

[Rahul Ba]

Hi all,

I am trying to code some of the basic example in spring.In the following code, I am not able to show validation messages.


index.jsp

    
<form method="post" action="/springFormValidation/login.do">

<spring:bind path="userBean.userName">
	Username:<input type="text" name="userName"  value="<c:out value="${status.value}"/>"/>
</spring:bind>		
<spring:bind path="userBean.password">
	Password:<input type="password" name="password"/>
</spring:bind>
	<input type="submit" name="Submit">


<spring:bind path="userBean">
<c:forEach items="${status.errorMessages}"
var="errorMessage">
<font class="error">
<c:out value="Some error"/><br>
</font>
</c:forEach>
</spring:bind>
</form>	

2.loginFormController.java

  public class LoginFormController extends SimpleFormController {

	public LoginFormController() {
        setCommandClass(User.class);
    }
	public Object formBackingObject(HttpServletRequest request) throws ServletException
	{
		User backingObject = new User();
		System.out.println("formBackingObject");
	return backingObject;
	}
	
    public ModelAndView onSubmit(Object command) throws ServletException {
    	User user = (User)command;
    	System.out.println("username :"+user.getUserName());
    	System.out.println("password :"+user.getPassword());
    	//Now you can validate to database
    	return new ModelAndView("success","user1",user.getUserName());
    }
}
  

3.LogonFormValidator.java

  
public class LogonFormValidator implements Validator{

	public boolean supports(Class clazz) {
	return clazz.equals(User.class);
	}

	public void validate(Object obj, Errors errors) {
	User user = (User) obj;
	
	System.out.println("Username in Validate method is:"+user.getUserName());
	if (user == null) {
	errors.rejectValue("username", "error.login.not-specified", null,"Value required.");
	} else {


	if (user.getUserName()== null || user.getUserName().trim().length() <= 0) {
	System.out.println("user name null value");
	errors.rejectValue("userName", "error.login.invalid-user",
	null, "Username is Required.");
	} else {
	if (user.getPassword()== null || user.getPassword().trim().length() <= 0) {
	errors.rejectValue("password", "error.login.invalid-pass",
	null, "Password is Required.");
	}
	}

	}
	}
	}

  

4.springapp-servlet.xml

  
	<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
	        <property name="mappings">
	            <props>
	                <prop key="/login.do">LoginFormController</prop>
	            </props>
	        </property>
	    </bean>

 
   <bean id="LoginFormController" class="com.controllers.LoginFormController">
      <property name="sessionForm"><value>true</value></property>        				<!-- Keep command object throughout session? -->
      <property name="commandName"><value>userBean</value></property> 				<!-- How it’s referenced in the JSP -->
      <property name="commandClass"><value>com.bean.User</value></property>   	<!-- Its class -->
      <property name="validator"><ref bean="logonFormValidator"/></property>
      <property name="formView"><value>index</value></property>
      <property name="successView"><value>success</value></property>
   </bean>


	<bean id="logonFormValidator" class="com.validators.LogonFormValidator"/>

	<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

  

Question: so, when I do not enter anything in username input field, I am not able to see error messages? Any reason?

Thanks in advance.

Rahul

[David Newton]

Don't know, but wouldn't you want to validate the password regardless of username validation failure?

[Rahul Ba]

Hi david,

No, I am just learning the Spring MVC ..hence just want to validate username.

Rahul

[David Newton]

Hmm. Well, more often than not, it's nicer to the user to give them all the error messages at once, rather than making them fill out the form n times.

[Hong Anderson]

I recommend to use Spring form tag.