Sorry for not answering so long...

> I would like to know the cause of this issue:
>
> org.firebirdsql.jdbc.FBSQLException: Corresponding connection is not
> valid.
>
> My connection works fine, but this problem occurs.
>
> What´s the cause, excess in use ??

The error message is a bit misleading. It tells that the statement handle is
no longer valid, but this can happen only when the underlying physical
connection is closed. I will change the error message.

However, in order to find the issue, whether it is in your code or in
JayBird, I need a test case that reproduces the issue.

Thanks!
Roman