java.util.NoSuchElementException after stesstest

Hello,

After and while running a stresstest with a tool i get the following error.
My code stops at PersistenceBrokerFactory.defaultPersistenceBroker(). I know
it is imposible to see what is happening from the trace and that it happens
in apache - commons code but maybe somebody has seen this before and might
know what is going on.

org.apache.ojb.broker.PBFactoryException: Borrow broker from pool failed,
using PBKey org.apache.ojb.broker.PBKey: jcdAlias=oracle, user=myvision,
password=*****
    at
org.apache.ojb.broker.core.PersistenceBrokerFactoryDefaultImpl.createPersistenceBroker
(PersistenceBrokerFactoryDefaultImpl.java:120)
    at
org.apache.ojb.broker.core.PersistenceBrokerFactoryBaseImpl.defaultPersistenceBroker
(PersistenceBrokerFactoryBaseImpl.java:161)
    at
org.apache.ojb.broker.PersistenceBrokerFactory.defaultPersistenceBroker(
PersistenceBrokerFactory.java:75)
    at com.myvision.persistance.orm.ojb.OjbDelegate.currentBroker(
OjbDelegate.java:356)
    at com.myvision.persistance.orm.ojb.OjbDelegate.getFromCache(
OjbDelegate.java:62)
    at com.myvision.business.GenericDelegate.getFromCache(
GenericDelegate.java:277)
    at com.myvision.business.GenericDelegate.getSingleTon(
GenericDelegate.java:284)
    at com.myvision.business.MyVisionSettingsDelegate.getMyVisionSettings(
MyVisionSettingsDelegate.java:35)
    at com.myvision.util.ExceptionUTILS$1.run(ExceptionUTILS.java:30)
Caused by: java.util.NoSuchElementException
    at org.apache.commons.pool.impl.GenericKeyedObjectPool.borrowObject(
GenericKeyedObjectPool.java:758)
    at
org.apache.ojb.broker.core.PersistenceBrokerFactoryDefaultImpl.createPersistenceBroker
(PersistenceBrokerFactoryDefaultImpl.java:101)

Cheers,
Dennis