For the following code:

@Named
@ViewScoped
public class UserAdmin implements Serializable {
}

When it is view scoped or session scoped, the class needs to implements Serializable. It seems to me that in older NetBeans, when I forget to implements Serializable, I can quickly see the exception in the log and fix it. But in the new version, I cannot see the exception, but I cannot deploy the application. I am lost and don't know what happen, so I choose to reinstall netbeans, clear the cache etc. It is only after long time that I find out it is all because I didn't 
implements Serializable for the class. It would be better for netbeans to throw the exception as older version. Or maybe it is because of different version of JSF or Glassfish?