Borrow broker from pool failed. in production server

Marwane <[email protected]>
Newsgroups gmane.comp.jakarta.ojb.user
Message-ID <[email protected]> 
hi
we have a web application on production used about 500 users.
we use default value of ojb parameters (maxActif: 100 ....).
we are getting frequently the message indicating that we can't borrow
connection from pool. even if
we use maxActif in 1000 the problem persist.
we need your help and give us some leads.

stack trace :

org.apache.ojb.broker.PBFactoryException: Borrow broker from pool failed,
using PBKey org.apache.ojb.broker.PBKey: jcdAlias=default, user=db2bmce,
password=*****
    at java.lang.Throwable.<init>(Throwable.java:195)
    at java.lang.Exception.<init>(Exception.java:41)
    at java.lang.RuntimeException.<init>(RuntimeException.java:43)
    at org.apache.commons.lang.exception.NestableRuntimeException.<init>(
NestableRuntimeException.java:86)
    at org.apache.ojb.broker.OJBRuntimeException.<init>(Unknown Source)
    at org.apache.ojb.broker.PBFactoryException.<init>(Unknown Source)
    at
org.apache.ojb.broker.core.PersistenceBrokerFactoryDefaultImpl.createPersistenceBroker(Unknown
Source)
    at
org.apache.ojb.broker.core.PersistenceBrokerFactoryBaseImpl.defaultPersistenceBroker(Unknown
Source)
    at
org.apache.ojb.broker.PersistenceBrokerFactory.defaultPersistenceBroker(Unknown
Source)
    at
ma.co.omnidata.framework.services.dao.ojb.OJBPersistenceService.getBroker(
OJBPersistenceService.java:156)
    at
ma.co.omnidata.framework.services.dao.ojb.OJBPersistenceService.newSession(
OJBPersistenceService.java:250)
    at
ma.co.omnidata.framework.services.transaction.impl.TransactionManagerImpl.getTransaction
(TransactionManagerImpl.java:39)
    at
ma.co.omnidata.framework.services.businessInterface.OMNIFacade.invokeService
(OMNIFacade.java:55)
    at
ma.co.omnidata.framework.services.ihm.struts.core.OMNIBaseAction.invokeBusiness
(OMNIBaseAction.java:120)
    at
com.rmawatanya.convergence.application.technique.habilitation.ihm.action.HabLogonAction.doExecute
(HabLogonAction.java:47)
    at
com.rmawatanya.convergence.application.technique.habilitation.ihm.action.HabLogonAction.execute
(HabLogonAction.java:35)
    at org.apache.struts.action.RequestProcessor.processActionPerform(
RequestProcessor.java:421)
    at org.apache.struts.action.RequestProcessor.process(
RequestProcessor.java:226)
    at org.apache.struts.action.ActionServlet.process(ActionServlet.java
:1164)
    at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:415)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:851)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(
ServletWrapper.java:1246)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(
ServletWrapper.java:380)
    at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(
CacheServletWrapper.java:80)
    at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java
:1724)
    at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(
WCChannelLink.java:79)
    at
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(
HttpInboundLink.java:422)
    at
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(
HttpInboundLink.java:319)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(
HttpInboundLink.java:288)
    at
com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminaters
(NewConnectionInitialReadCallback.java:207)
    at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete
(NewConnectionInitialReadCallback.java:109)
    at com.ibm.ws.tcp.channel.impl.WorkQueueManager.requestComplete(
WorkQueueManager.java:537)
    at com.ibm.ws.tcp.channel.impl.WorkQueueManager.attemptIO(
WorkQueueManager.java:593)
    at com.ibm.ws.tcp.channel.impl.WorkQueueManager.workerRun(
WorkQueueManager.java:946)
    at com.ibm.ws.tcp.channel.impl.WorkQueueManager$Worker.run(
WorkQueueManager.java:1038)
    at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1446)
Caused by: java.util.NoSuchElementException
    at java.lang.Throwable.<init>(Throwable.java:180)
    at java.lang.Exception.<init>(Exception.java:29)
    at java.lang.RuntimeException.<init>(RuntimeException.java:32)
    at java.util.NoSuchElementException.<init>(NoSuchElementException.java
:28)
    at org.apache.commons.pool.impl.GenericKeyedObjectPool.borrowObject(
GenericKeyedObjectPool.java:760)
    ... 31 more
[18/10/06 11:59:53:253 TUC] 00000379 SystemErr     R
org.apache.ojb.broker.PBFactoryException: Borrow broker from pool failed,
using PBKey org.apache.ojb.broker.PBKey: jcdAlias=default, user=db2bmce,
password=*****
    at java.lang.Throwable.<init>(Throwable.java:195)
    at java.lang.Exception.<init>(Exception.java:41)
    at java.lang.RuntimeException.<init>(RuntimeException.java:43)
    at org.apache.commons.lang.exception.NestableRuntimeException.<init>(
NestableRuntimeException.java:86)
    at org.apache.ojb.broker.OJBRuntimeException.<init>(Unknown Source)
    at org.apache.ojb.broker.PBFactoryException.<init>(Unknown Source)
    at
org.apache.ojb.broker.core.PersistenceBrokerFactoryDefaultImpl.createPersistenceBroker(Unknown
Source)
    at
org.apache.ojb.broker.core.PersistenceBrokerFactoryBaseImpl.defaultPersistenceBroker(Unknown
Source)
    at
org.apache.ojb.broker.PersistenceBrokerFactory.defaultPersistenceBroker(Unknown
Source)
    at
ma.co.omnidata.framework.services.dao.ojb.OJBPersistenceService.getBroker(
OJBPersistenceService.java:156)
    at
ma.co.omnidata.framework.services.dao.ojb.OJBPersistenceService.newSession(
OJBPersistenceService.java:250)
    at
ma.co.omnidata.framework.services.transaction.impl.TransactionManagerImpl.getTransaction
(TransactionManagerImpl.java:39)
    at
ma.co.omnidata.framework.services.businessInterface.OMNIFacade.invokeService
(OMNIFacade.java:55)
    at
ma.co.omnidata.framework.services.ihm.struts.core.OMNIBaseAction.invokeBusiness
(OMNIBaseAction.java:120)
    at
com.rmawatanya.convergence.application.technique.habilitation.ihm.action.HabLogonAction.doExecute
(HabLogonAction.java:47)
    at
com.rmawatanya.convergence.application.technique.habilitation.ihm.action.HabLogonAction.execute
(HabLogonAction.java:35)
    at org.apache.struts.action.RequestProcessor.processActionPerform(
RequestProcessor.java:421)
    at org.apache.struts.action.RequestProcessor.process(
RequestProcessor.java:226)
    at org.apache.struts.action.ActionServlet.process(ActionServlet.java
:1164)
    at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:415)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:851)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(
ServletWrapper.java:1246)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(
ServletWrapper.java:380)
    at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(
CacheServletWrapper.java:80)
    at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java
:1724)
    at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(
WCChannelLink.java:79)
    at
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(
HttpInboundLink.java:422)
    at
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(
HttpInboundLink.java:319)
    at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(
HttpICLReadCallback.java:84)
    at com.ibm.ws.tcp.channel.impl.WorkQueueManager.requestComplete(
WorkQueueManager.java:537)
    at com.ibm.ws.tcp.channel.impl.WorkQueueManager.attemptIO(
WorkQueueManager.java:593)
    at com.ibm.ws.tcp.channel.impl.WorkQueueManager.workerRun(
WorkQueueManager.java:946)
    at com.ibm.ws.tcp.channel.impl.WorkQueueManager$Worker.run(
WorkQueueManager.java:1038)
    at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1446)
Caused by: java.util.NoSuchElementException
    at java.lang.Throwable.<init>(Throwable.java:180)
    at java.lang.Exception.<init>(Exception.java:29)
    at java.lang.RuntimeException.<init>(RuntimeException.java:32)
    at java.util.NoSuchElementException.<init>(NoSuchElementException.java
:28)
    at org.apache.commons.pool.impl.GenericKeyedObjectPool.borrowObject(
GenericKeyedObjectPool.java:760)
    ... 29 more
[18/10/06 12:00:00:846 TUC] 00000379 SystemErr     R
org.apache.ojb.broker.PBFactoryException: Borrow broker from pool failed,
using PBKey org.apache.ojb.broker.PBKey: jcdAlias=default, user=db2bmce,
password=*****
    at java.lang.Throwable.<init>(Throwable.java:195)
    at java.lang.Exception.<init>(Exception.java:41)
    at java.lang.RuntimeException.<init>(RuntimeException.java:43)
    at
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