springmvc jsr303 validator co-exist with spring WebDataBinder validator in one action - spring

Question

Since springmvc 3.x now supports jsr303 and old spring style validator, i want to mix them in my sample apps. But there is only one method enabled for a specified controller, is that the limit of spring framework or JSR standard?
Here is my sample code.
User.java, stands for the domain model, uses JSR303 for validation.
public class User{
#Size(max = 16, message = "user loginId max-length is 16")
private String loginId;
//omit getter and setter
}
UserValidator.java, implements the org.springframework.validation.Validator interface to support user validation.
public class UserValidator implements Validator {
private UserService userService;
public boolean supports(Class<?> clazz) {
return User.class.isAssignableFrom(clazz);
}
public void validate(Object target, Errors errors) {
User u = (User) target;
// loginName check for new user
if (u.getUserId() == null && !userService.isLoginIdUnique(u.getLoginId(), null)) {
errors.rejectValue("loginId", "user.loginId.unique", new Object[] { u.getLoginId() }, null);
}
}
#Autowired
public void setUserService(UserService userService) {
this.userService = userService;
}
}
UserController.java, uses InitBinder annotation to inject UserValidator into WebDataBinder.
#Controller("jspUserController")
#RequestMapping("/sys/users")
public class UserController {
private UserValidator userValidator;
#Autowired
public void setUserValidator(UserValidator userValidator) {
this.userValidator = userValidator;
}
/*#InitBinder("user")
public void initBinderUser(WebDataBinder binder) {
binder.setValidator(userValidator);
}*/
#RequestMapping(value = "/save")
public String save(#Valid User user, BindingResult bindingResult, Model model, HttpServletRequest request) {
if (bindingResult.hasErrors()) {
return "/sys/user/edit";
}
userService.saveUser(user);
return "redirect:/sys/users/index";
}
}
If I uncomment the #InitBinder("user") in UserController, the JSR303 validation will be disabled. While the current commented code will use JSR validator to do the validation.
Can anyone give me a workaround to mix them in one controller?

Answer 1

You can ADD your validator instead of SETTING it :
#InitBinder("user")
public void initBinderUser(WebDataBinder binder) {
binder.addValidators(userValidator);
}
This will execute the JSR303 validations first and then your custom validator. No need then to call the validator directly in the save method.

Answer 2

You can use your validator directly and let the global LocalValidatorFactoryBean (JSR-303) do its work as well:
#Controller("jspUserController")
#RequestMapping("/sys/users")
public class UserController {
private UserValidator userValidator;
#Autowired
public void setUserValidator(UserValidator userValidator) {
this.userValidator = userValidator;
}
#RequestMapping(value = "/save")
public String save(#Valid User user, BindingResult bindingResult, Model model, HttpServletRequest request) {
this.userValidator.validate(user, bindingResult);
if (bindingResult.hasErrors()) {
return "/sys/user/edit";
}
userService.saveUser(user);
return "redirect:/sys/users/index";
}
}