Playframework! Using #select for a Enum property - validation

Question

I'm trying to create a #select input for a enum field. Everything works fine until the form is submitted. It fails with a weird validation error -> "error.invalid"
here's my code
Enum class
package model;
...
public enum UserType {
UserType_Admin("Administrator"), UserType_Monitor("Monitor"), UserType_Audit("Audit");
private String desc;
private UserType(String desc) {
this.desc = desc;
}
#Override
public String toString() {
return Messages.get(desc);
}
public String getLabel() {
return toString();
}
public String getKey() {
return super.toString();
}
public static Map<String, String> options() {
LinkedHashMap<String, String> options = new LinkedHashMap<String, String>();
for (UserType ut : UserType.values()) {
Integer o = ut.ordinal();
options.put(o.toString(), ut.desc);
}
return options;
}
}
My Entity
#Entity
public class User extends Model {
...
#Id
public Long userID;
public UserType user_type;
}
Scala template
#form(routes.Users.save(userID)) {
#select(
userForm("user_type"),
options(model.UserType.options),
'_label -> Messages("UserType"), '_default -> Messages("choose_user_type"),
'_showConstraints -> true
)
}
on the controller the Save method:
public static Result save(Long userID) {
Form<User> userForm = form(User.class).bindFromRequest();
if (userForm.hasErrors()) { <- here it says that has errors
return badRequest(useredit.render(new Session(session()), userID,
userForm, new User()));
}
...
}
if I inspect the userForm variable, I get:
Form(of=class model.User, data={user_type=0}, value=None,
errors={user_type=[ValidationError(user_type,error.invalid,[])]})
The field user_type has the correct value, 0 if I choose the first item, 1 for the second, etc.
Screenshot
Anyone has a clue or a workaround for this? Maybe disable validation for this field? Tks guys