HibernateStringUpdateLog getters always return null.

HibernateStringUpdateLog.getOldValue() and getNewValue() return only null.

public class HibernateStringUpdateLog extends VariableUpdateLog {
...
public Object getOldValue()

{ return null; }

public Object getNewValue() { return null; }

}

I know that HibernateStringUpdateLog getter is not used because hibernate-mapping is default-access="field".
However, VariableUpdateLog.toString() call the getNewValue(). Therefore, some applications may cause problems null is returned.