Submitted by: @mrotteveel

The org.firebirdsql.encodings.Encoding_NotOneByte has nullpointer dereference (so it throws NPE) if the encoding does not actually exist (UnsupportedEncodingException) in some of it methods, in other similar methods it will return null when this occurs.

This needs to be fixed either by throwing a checked or unchecked exception when the UnsupportedEncodingException occurs, always return an expected error value or maybe check the existence of the encoding in the constructor so the object is never available for use when the encoding is not supported.