Validation of wrapper in spring form - spring

Question

I've wrapped two objects I wanted to use in one form. Here is the wrapper class:
public class UserCustomer {
User user;
Customer customer;
//Getters and setters
//Constructors
Controller:
#Controller
public class RegisterController {
#RequestMapping("/register")
public String showRegister(Model model){
model.addAttribute("userCustomer", new UserCustomer(new User(), new Customer()));
return "register";
}
#RequestMapping(value="/doRegister", method = RequestMethod.POST)
public String doRegister(Model model, #Valid UserCustomer userCustomer, BindingResult bindingResult){
if(bindingResult.hasErrors()){
return "register";
}
System.out.println(userCustomer.getUser());
return "registered";
}
}
And the form:
<h3 class="new-models">For New Customers</h3>
<div class="register">
<sf:form method="post" action="${pageContext.request.contextPath}/doRegister" commandName="userCustomer">
<div class="register-top-grid">
<h3>PERSONAL INFORMATION</h3>
<div>
<span>First Name<label>*</label></span>
<sf:errors path="customer.name" cssClass="alert-danger"/>
<sf:input name="name" type="text" path="customer.name"/>
</div>
<div>
<span>Last Name<label>*</label></span>
<sf:errors path="customer.surname" cssClass="alert-danger"/>
<sf:input name="surname" type="text" path="customer.surname"/>
</div>
<div>
<span>Email Address<label>*</label></span>
<sf:errors path="user.email" cssClass="alert-danger"/>
<sf:input name="email" type="text" path="user.email"/>
</div>
<div>
<span>Username<label>*</label></span>
<sf:errors path="user.username" cssClass="alert-danger"/>
<sf:input name="username" type="text" path="user.username"/>
</div>
<div class="clearfix"> </div>
<!--a class="news-letter" href="#">
<label class="sf:checkbox">
<!--sf:input type="checkbox" name="newsletter" path="customer.newsletter" checked=""/><i> </i>Sign Up for Newsletter</label>
</a-->
<a class="news-letter" href="#"></a>
</div>
<div class="register-bottom-grid">
<h3>LOGIN INFORMATION</h3>
<div>
<span>Password<label>*</label></span>
<sf:errors path="user.password" cssClass="alert-danger"/>
<sf:input name="password" type="password" path="user.password"/>
</div>
<div>
<span>Confirm Password<label>*</label></span>
<sf:input type="password" path=""/>
</div>
</div>
<div class="clearfix"> </div>
<div class="register-but">
<input type="submit" value="register">
<div class="clearfix"> </div>
</div>
</sf:form>
</div>
Everything seems to be working fine, except for validation. I don't really know how to make validation in this wrapper.
Example validation for email in User class:
#Pattern(regexp = ".*\\#.*\\..*")

Answer 1

I have solved myself this problem, it's way more simple than I have expected it would be.
Validation works simply by adding #Valid annotation above user and customer fields in this wrapper, so that spring knows to actually validate them "deeper".