java - Spring MVC - Instantiate nested object only when input is filled -

i have these models:

@entity public class user {      //...     @notblank private string login;     @notblank private string password;     @valid @onetoone private person person;      //... }  // ,  @entity public class person {      //...       @notblank private string name;      //... } 

and insert method in user controller:

@requestmapping(method = post) public string insert(@valid user user, bindingresult result){  } 

and form

<p>login : <input type="text" name="login" /></p> <p>pass : <input type="text" name="password" /></p> <p>name : <input type="text" name="person.name" /></p> 

association between person , user optional. don't need fill person.name input.

but when controller receive user's information @valid annotation validating both user , person objects person.name empty.

i realized controller receiving person object instance always.

is possible receive null in person when person.name input not filled?

when remove person.name input form, ok, receive null. peson name optional , cant remove form.

try remove @notblank @ person name :

@entity public class person {      private string name;  }