The problem concerns the javamail class javax.mail.internet.InternetAddress and the method String getPersonal()

When there is a leter 'Ü' in an email aadress, but the mail client has not encoded it. Then method getPersonal() returns a non valid unicode string. The API sais that when the decoding or convertion fails it returns the raw data.

My question is: In case of this error, the method doesn't seem to return the raw data, so how can I extract it from the wrongly converted string?

Or is there any way of knowing when this kind of error has occured, so I coult use the raw data directly?