The SnmpPoller needs to be revisited.
First of all it has to be reviewed the log strategy.
2011-04-30 14:45:32,804 ERROR [SnmpinterfacepollerScheduler-50 Pool-fiber43] SnmpPollInterfaceMonitor: Snmp Value is null for oid: .18.104.22.168.22.214.171.124.1.7.2
Should be a WARN and not an ERROR.
More the snmpPoller must thrown the hibernate exception when an SnmpInterface is not into the database.
Especially there must be more care about sync the SnmpPoller pollable interface and the interface that are actually stored into the database.