Cannot allocate any more connections after 10.2.0.3 to 10.2.0.5 upgrade

Recently upgraded Oracle from 10.2.0.3 to 10.2.0.5 and Glassfish from v3.0 to v3.1. We have not experienced errors of this kind previous to that change.
We performed the operation on our test server first and experienced no issues save some 'expect behaviour' changes as listed elsewhere.
Since upgrading on our live server we have a few times come across issues where Glassfish has used up all the connections in it's connection pool. Looking at Oracle statistics for the times where this occured showed no such matching surge in connections on the Oracle side. Usage statistics show no abnormally high number of users or log-ins at the times when this problem occurs, and the usage numbers are an order of magnitude under the maximum supported volumes that we have tested/prepared for.
This problem may be at the Oracle or Glassfish end, but we are running out of ideas so are appealing for help and suggestions from a number of forums in order to get this pinned down.
In the meantime, we are giving our larger web applications their own connection pools incase there is a code-side problem, though the spread of errors suggests this isn't going to be the case.
If there is any extra logging that can be done to pin down the source of the problem, I'd be eager to hear about it.
Sample Error in Glassfish logs:
Caused by: javax.resource.spi.ResourceAllocationException: Error in allocating a connection. Cause: In-use connections equal max-pool-size therefore cannot allocate any more connections.
     at com.sun.enterprise.connectors.ConnectionManagerImpl.internalGetConnection(ConnectionManagerImpl.java:310)
     at com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:236)
     at com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:165)
     at com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:160)
     at com.sun.gjc.spi.base.DataSource.getConnection(DataSource.java:110)
     ... 24 more
Caused by: com.sun.appserv.connectors.internal.api.PoolingException: In-use connections equal max-pool-size therefore cannot allocate any more connections.
     at com.sun.enterprise.resource.pool.UnpooledResource.getUnenlistedResource(UnpooledResource.java:115)
     at com.sun.enterprise.resource.pool.ConnectionPool.internalGetResource(ConnectionPool.java:526)
     at com.sun.enterprise.resource.pool.ConnectionPool.getResource(ConnectionPool.java:381)
     at com.sun.enterprise.resource.pool.PoolManagerImpl.getResourceFromPool(PoolManagerImpl.java:242)
     at com.sun.enterprise.resource.pool.PoolManagerImpl.getResource(PoolManagerImpl.java:167)
     at com.sun.enterprise.connectors.ConnectionManagerImpl.getResource(ConnectionManagerImpl.java:341)
     at com.sun.enterprise.connectors.ConnectionManagerImpl.internalGetConnection(ConnectionManagerImpl.java:304)
     ... 28 more
|#]

790951 wrote:
Not opened a SR. DataSource config as follows (some bits hidden for obvious reasons):
<jdbc-connection-pool datasource-classname="oracle.jdbc.pool.OracleDataSource" max-pool-size="900" pooling="false" res-type="javax.sql.DataSource" connection-leak-timeout-in-seconds="3600" steady-pool-size="20" name="jdbc/OurResourceDS" connection-leak-reclaim="true">
<property name="DataSourceName" value="jdbc/OurResourceDS"></property>
<property name="Password" value="hidden-"></property>
<property name="URL" value="jdbc:-hidden-"></property>
<property name="User" value="-hidden-"></property>
</jdbc-connection-pool>Looks like pooling has been disabled - is this on purpose ?
Using Connection Pooling With Oracle Data Provider for .Net (Doc ID 240997.1)
HTH
Srini

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Cannot allocate any more connections after 10.2.0.3 to 10.2.0.5 upgrade

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