Sessions not being closed properly

INFO  00:08:33,402  - Session a70d0aeb-92e2-4ff7-88cf-14108e7533d3 has been idle for more than 28800000 milliseconds - preparing to close
INFO  00:08:33,402  - Session a70d0aeb-92e2-4ff7-88cf-14108e7533d3 closed

        try
        {
            // commit transaction
        }
        catch (Exception ex)
        {
            // handle exception
        }
        finally
        {
            client.close();
            client = null;
        }