websphere5.0 + hibernate2 + oracle9i +proxool

logs:

2006-03-30 10:36:52,531 WARN [Servlet.Engine.Transports : 49] proxool.ehr ( ?:?) - 003773 (05/10/00) - #8 registered a statement as closed which wasn't known to be open.
2006-03-30 10:36:53,875 WARN [Servlet.Engine.Transports : 44] proxool.ehr ( ?:?) - 003803 (01/10/00) - #8 registered a statement as closed which wasn't known to be open.
2006-03-30 10:36:54,000 WARN [Servlet.Engine.Transports : 44] proxool.ehr ( ?:?) - Unable to set status of connection 8 from ACTIVEto AVAILABLE. It remains AVAILABLE
2006-03-30 10:37:06,484 WARN [Servlet.Engine.Transports : 35] proxool.ehr ( ?:?) - 003983 (00/10/00) - #2 registered a statement as closed which wasn't known to be open.
2006-03-30 10:37:06,578 WARN [Servlet.Engine.Transports : 35] proxool.ehr ( ?:?) - Unable to set status of connection 2 from ACTIVEto AVAILABLE. It remains AVAILABLE
2006-03-30 10:37:08,781 WARN [Servlet.Engine.Transports : 34] proxool.ehr ( ?:?) - 004007 (02/10/00) - #5 registered a statement as closed which wasn't known to be open.
2006-03-30 10:37:09,188 WARN [Servlet.Engine.Transports : 48] proxool.ehr ( ?:?) - 004011 (02/10/00) - #9 registered a statement as closed which wasn't known to be open.
2006-03-30 10:37:15,078 WARN [Servlet.Engine.Transports : 47] proxool.ehr ( ?:?) - 004085 (01/10/00) - #9 registered a statement as closed which wasn't known to be open.