(This is basically a follow on this question.)
I need to access the DB service layer in one of my form validators (to make sure the email is not already taken when registering a new user).
I tried the following (some input-fields omitted for brevity):
public class RegistrationPage extends WebPage {
@Inject
private UserService userService;
public RegistrationPage() {
add(new FeedbackPanel("feedback"));
TextField<String> email = new TextField<String>("email", Model.of(""));
...
email.add(new IValidator<String>() {
@Override
public void validate(IValidatable<String> validatable) {
String email = validatable.getValue();
if (userService.findUserByEmail(email) != null) {
// report error...
}
}
});
Form<?> form = new Form<Void>("registrationForm") { ... };
form.add(email);
add(form);
}
}
This can unfortunately result in a
java.lang.IllegalStateException: EntityManager is closed
I suspect that the problem is due to the fact that I'm using open-session-in-view and that multiple form-submissions span over several requests. The userService is injected for the first request and (illegally) reused in subsequent requests. (Multiple form-submissions happen if the validation fails and the user attempts to submit the form again.)
My Question
What is the best way to solve this? The same way as I solved the previous, similar problem? It will undoubtedly get messier in this case.
