I find this in my logs:
12:23:40,037 WARN [AbstractDAO] org.firebirdsql.jdbc.FBSQLException:
This statement is already closed.
After closing a PreparedStatment that had already been closed.

The API states:
"Calling the method close on a Statement object that is already closed
has no effect."
http://java.sun.com/j2se/1.4.2/docs/api/java/sql/Statement.html#close()

Rick DeBay
Senior Software Developer
RxStrategies.net