freemarker validation_matlab validation_validation myeclipse(3)

And my Controller looks like this

@RequestMapping( value = "/add", method = RequestMethod.POST ) 
public String addUser(
        @RequestParam(value="isAdmin",defaultValue="false") Boolean isAdmin,
        @RequestParam(value="passVerification" ) String passVerification,
        @ModelAttribute("user") C_UserDAO newUser
) {
    final BindException errors = new BindException( newUser, "user" );
    m_userValidator.validate( newUser, errors );
    ...
    if( !newUser.getPassword().equals( passVerification ) && !newUser.getPassword().equals( "" ) ) {
        errors.rejectValue( "password", "user.password.missmatch", "The passwords aren't equal, try again" );
    }
    if( errors.hasErrors() ) {
        return "addUserForm";
    }
    ...
    return "redirect:thanks.html";
}

The validation works like a charm, but when an error occures, the view doesn't change and no error is shown. I've read the documentation over and over again but i can't find a clou how to solve the problem. What's my error?

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