Could your show us the code in nl.leden.data.BaseDAO.releaseJDBCResources()? The exception suggests that you are closing the connection in a way that does not return the connection to the pool, but closes the actual connection. AFAIK this can also occur when certain exceptions occur.

Mark

> The suggestion of Mark solvend most of the problems.
>
> I still get problems. See error messages below.
>
> org.firebirdsql.jdbc.FBSQLException: Connection
> org.firebirdsql.pool.PooledConnectionHandler@bb7465 was closed. See
> the attached exception to find the place where it was closedsql
> exception: Connection
> org.firebirdsql.pool.PooledConnectionHandler@bb7465 was closed. See
> the attached exception to find the place where it was closed
>
> at org.firebirdsql.pool.PooledConnectionHandler.invoke
> (PooledConnectionHandler.java:209)
> at $Proxy0.isClosed(Unknown Source)
> at nl.leden.data.BaseDAO.releaseJDBCResources
> (BaseDAO.java:79)
> at nl.leden.data.NotaDAO.getOpenStaande(NotaDAO.java:110)

[see original mail for remainder of stacktrace]

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