Annotation autowiring

[anurudda_spring]

Hi all,
I'm using spring 2.5 and tomcat 6.0. I'm having a problem with regard to annotation based auto wiring.
I have a user sign up page where it is required to check whether username is already taken in validation in form submit.
For this I have used service class called UserManager. Eventhough I have autowired UserManager in UserValidator class when form is submitted, a null pointer exception thrown saying userManager property of UserValidator class is null. Below I have listed relevant code.. Any help would be greatly appreciated.

<at>Controller
<at>RequestMapping("sign_up")
public class RegisterController {

	<at>Autowired
	private UserManager userManager;

	<at>RequestMapping(method = RequestMethod.GET)
	public String setupForm(ModelMap model) {
		logger.info("setup sign up");
		model.addAttribute("user", new User());
		return "sign_up";
	}

	<at>RequestMapping(method = RequestMethod.POST)
	public String processSubmit(<at>ModelAttribute("user")
	User user, BindingResult result, SessionStatus status) {
		Validator validator = new UserValidator();
		validator.validate(advertiser, result);
		if (result.hasErrors()) {
			logger.info("validation failed: " + result.getFieldErrors());
			return "sign_up";
		} else {
			userManager.addUser(user);
			return "redirect:account_created";
		}
		
	}

}



public class UserValidator implements Validator {

	<at>Autowired
	private UserManager userManager;
	
	public boolean supports(Class clazz) {
		return User.class.equals(clazz);
	}

	public void validate(Object obj, Errors errors) {
                User user = (User) obj;
		....
		if(userManager.userExists(user.getUsername())){
			errors.rejectValue("username","error.userexists", null,"Username already taken.");
		}

                ......
	}

}




<at>Service("userManager")
public class UserManagerImpl implements UserManager {
	protected Log logger = LogFactory.getLog(getClass());
	
	<at>Autowired
	private UserDao userDao;

        .............
	public boolean userExists(String name) {
		return userDao.isUser(name);
	}
        ........


}



<at>Repository("userDao")
public class JdbcUserDao extends SimpleJdbcDaoSupport implements
		UserDao {

	<at>Autowired
	public JdbcUserDao(DataSource dataSource){
		setDataSource(dataSource);
	}


	public boolean isUser(String username) {
		List<User> users = getSimpleJdbcTemplate().query(
				"SELECT * FROM user WHERE username=:username",
				new UserMapper(),
				new MapSqlParameterSource().addValue("username", username));
		if(users.isEmpty()){
			return false;
		}else{
			return true;
		}
	}
         .....


}

[Marten Deinum]

Well if you do

Validator validator = new UserValidator();

How do you expect Spring to inject dependencies? You are creating a new one yourself outside the control of Spring. Inject the validator into your controller like your userManager.

[anurudda_spring]

Thanks Marten!
Actually didn't think about that