Spring Validation - Errors not displayed - validation

Question

I'm using a combination of Annotation validation and a Custom Validator
Object:
#Entity
#Table(name = "monitoringsystems")
public class MonitoringSystem {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private long id;
#NotNull(message = "Name must not be empty.")#Size(min=1, message="Name must not be empty.")
private String name;
#NotNull(message = "URL must not be empty.")#Size(min=1, message="Name must not be empty.")
private String url;
#NotNull(message = "Username must not be empty.")#Size(min=1, message="Name must not be empty.")
private String username;
#NotNull(message = "Password must not be empty.")#Size(min=1, message="Name must not be empty.")
private String password;
#NotNull(message = "Confirm Password must not be empty.")#Size(min=1, message="Name must not be empty.")
#Transient
private String passwordConfirm;
CustomValidator:
#Component
public class MonitoringSystemValidator implements Validator {
#Override
public boolean supports(Class<?> type) {
return MonitoringSystem.class.isAssignableFrom(type);
}
#Override
public void validate(Object o, Errors errors) {
MonitoringSystem monitoringSystem = (MonitoringSystem) o;
if(!monitoringSystem.getPassword().equals(monitoringSystem.getPasswordConfirm())){
errors.rejectValue("passwordConfirm", "Passwords are not equal.");
}
}
}
I initialize the custom validator in my controller and set the mapping for the form and the saving method.
Controller:
#Controller
public class MonitoringSystemController {
#Autowired
private MonitoringSystemValidator monitoringSystemValidator;
#InitBinder
public void dataBinding(WebDataBinder binder) {
binder.addValidators(monitoringSystemValidator);
}
#RequestMapping("/monitoringsystem/new")
public String newMonitoringSystem(Model model, HttpServletRequest request) {
MonitoringSystem monitoringSystem = new MonitoringSystem();
model.addAttribute("monitoringSystem", monitoringSystem);
request.getSession().setAttribute("anonymization", monitoringSystem.getAnonymization());
request.getSession().setAttribute("hosts", monitoringSystem.getHosts());
return "monitoringsystem/form";
}
#RequestMapping(value = "/monitoringsystem/save", method = RequestMethod.POST)
public String save(#Valid MonitoringSystem monitoringSystem, BindingResult result, HttpServletRequest request, Model model) {
if(result.hasErrors()){
model.addAttribute("monitoringSystem", monitoringSystem);
request.getSession().setAttribute("anonymization", request.getSession().getAttribute("anonymization"));
request.getSession().setAttribute("hosts", request.getSession().getAttribute("hosts"));
return "monitoringsystem/form";
}
//more code
In a first step I only want to change the CSS of my fields (I use bootstrap) so display the errors.
Form:
<form class="form-horizontal" th:modelAttribute="monitoringSystem" th:object="${monitoringSystem}" th:action="#{/monitoringsystem/save}" method="post">
<input type="hidden" th:field="*{id}"/>
<fieldset>
<legend>New Monitoring-System</legend>
<div class="form-group" th:classappend="${#fields.hasErrors('name')} ?: 'has-error has-danger'">
<label class="col-md-4 control-label" for="textinput">Systemname</label>
<div class="col-md-5">
<input th:field="*{name}" class="form-control input-md" type="text" />
</div>
</div>
<div class="form-group" th:classappend="${#fields.hasErrors('url')} ?: 'has-error has-danger'">
<label class="col-md-4 control-label" for="textinput">URL</label>
<div class="col-md-5">
<input th:field="*{url}" class="form-control input-md" type="text" />
</div>
</div>
<div class="form-group" th:classappend="${#fields.hasErrors('username')} ?: 'has-error has-danger'">
<label class="col-md-4 control-label" for="textinput">Username</label>
<div class="col-md-5">
<input th:field="*{username}" class="form-control input-md" type="text" />
</div>
</div>
<div class="form-group" th:classappend="${#fields.hasErrors('password')} ?: 'has-error has-danger'">
<label class="col-md-4 control-label" for="textinput">Password</label>
<div class="col-md-5">
<input th:field="*{password}" class="form-control input-md" type="password" />
</div>
</div>
<div class="form-group" th:classappend="${#fields.hasErrors('passwordConfirm')} ?: 'has-error has-danger'">
<label class="col-md-4 control-label" for="textinput">Confirm Password</label>
<div class="col-md-5">
<input th:field="*{passwordConfirm}" class="form-control input-md" type="password" />
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for="singlebutton"></label>
<div class="col-md-4">
<a th:href="#{/monitoringsystem}" class="btn btn-default btn-small">Cancel</a> <button id="singlebutton" name="singlebutton" class="btn btn-primary btn-small">Submit</button>
</div>
</div>
</fieldset>
</form>
My validation is working correctly. The form is only saved if my fields are not null, the size is greater 1 and the password match. If not, my controller redirects me to the form.
The problem is, that my css don't change. So there must be a problem with my view-code or the errorBinding is not passed correctly to the view. But I can't find my mistake.

Answer 1

There was an error in my if condition which add the errorclasses. I had to change ${#fields.hasErrors('url')} ?: 'has-error has-danger' to ${#fields.hasErrors('*{name}')} ? 'has-error has-danger'