> If I try to drop it using isql, I simply get "error -607 Table/View
> does not exist", but with the java driver comes the "No message for
> code found" message.

This is because isql uses API call to translate error code to a
string. Unfortunatelly we do not have this feature in Java, because
it is implemented in gds32.dll, not in the server itself. We have a
text file with mapping between error codes and messages that were
extracted from Firebird's official error message database. Since
driver was not able to find an error message in this file, it is
either out-dated, or the message was not in the database.

Best regards,
Roman Rokytskyy