On 7-3-2013 20:34, hugo.larson wrote:

> Hello,
> I'm not using iscSeekBlob or iscBlobInfo.

If you are using Blobs, then iscBlobInfo most likely is getting used
(iscSeekBlob depends on how you use blobs).

> The problem can't be related to network issues since it happens on localhost.
> I think that JBuilder DataExpress does not like that different threads execute statements simultaneously with same connections but that usually (I think) throws an exception "Resultset is already closed".
> I don't think I do that but will do some logging to exclude the possibility.

On localhost it likely isn't a network problem. The only reasons would
be that the Firebird server closes connections for some reason (this
would include Jaybird misbehaving), or you have a firewall or
virusscanner that allows connections, but only closes a port if it
generates too much traffic, but if that would be the cause, then I would
expect this to be a much more frequent occurrence.

What connection properties are you using?

Mark
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Mark Rotteveel