I have the same problem like here: solution
Execution exception:
[IllegalStateException: JSR-303 validated property 'phone' does not have a corresponding accessor for data binding - check your DataBinder's configuration (bean property versus direct field access)]
@Entity
public class Contact extends Model {
    @Id
    @GeneratedValue
    public Long id;
    @Required
    public String name;
    @Required
    public String phone;
    @Required
    @Email
    public String email;
    public static Finder<Long, Contact> find = new Finder<>(Contact.class);
}
When I add getters/setters ... it's OK