FAIL_OVER in jdbc url

Hello,
Recently one of db database node was down and our application did not connect to another node as per the below URL because we have configured FAIL_OVER=ON.
<connection-url>
jdbc:oracle:thin:@(DESCRIPTION=(LOAD_BALANCE=ON)(FAILOVER=ON)(ADDRESS=(PROTOCOL=TCP)(HOST=db02-vip)(PORT=1521))(ADDRESS=(PROTOCOL=TCP)(HOST=db01-vip)(PORT=1521))(CONNECT_DATA=(SERVICE_NAMEGDB.eada.com)))
</connection-url>
Can any one explain why fail over did not happen. We are using Oracle 10g and RHEL 5.3 OS.
Rgds,

Hi,
Due to Hardware failure one of the node was down. We expected our application to connect to another node which was up and running, but did not happen. It lasted for almost 1 hour. Once the node went down i could see only below exception in jboss server logs.
Initially i got below WARN messages :
2012-12-17 15:00:44,196 WARN [com.arjuna.ats.arjuna.logging.arjLoggerI18N] [com.arjuna.ats.arjuna.coordinator.BasicAction_58] - Abort of action id 619289df:dc67:50ce06ae:6bd9 invoked while multiple threads active within it.
2012-12-17 15:00:44,196 WARN [com.arjuna.ats.arjuna.logging.arjLoggerI18N] [com.arjuna.ats.arjuna.coordinator.CheckedAction_2] - CheckedAction::check - atomic action 619289df:dc67:50ce06ae:6bd9 aborting with 1 threads active!
2012-12-17 15:00:44,760 WARN [com.arjuna.ats.arjuna.logging.arjLoggerI18N] [com.arjuna.ats.arjuna.coordinator.BasicAction_58] - Abort of action id 619289df:dc67:50ce06ae:6bda invoked while multiple threads active within it.
2012-12-17 15:00:44,760 WARN [com.arjuna.ats.arjuna.logging.arjLoggerI18N] [com.arjuna.ats.arjuna.coordinator.CheckedAction_2] - CheckedAction::check - atomic action 619289df:dc67:50ce06ae:6bda aborting with 1 threads active!
Later after minutes i found below Exceptions
2012-12-17 15:04:04,218 WARN [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] Throwable while attempting to get a new connection: null
org.jboss.resource.JBossResourceException: Could not create connection; - nested throwable: (java.sql.SQLException: Io exception: Connection reset)
at org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:179)
at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.createConnectionEventListener(InternalManagedConnectionPool.java:577)
at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.getConnection(InternalManagedConnectionPool.java:262)
at org.jboss.resource.connectionmanager.JBossManagedConnectionPool$BasePool.getConnection(JBossManagedConnectionPool.java:500)
at org.jboss.resource.connectionmanager.BaseConnectionManager2.getManagedConnection(BaseConnectionManager2.java:341)
at org.jboss.resource.connectionmanager.TxConnectionManager.getManagedConnection(TxConnectionManager.java:315)
at org.jboss.resource.connectionmanager.BaseConnectionManager2.allocateConnection(BaseConnectionManager2.java:396)
at org.jboss.resource.connectionmanager.BaseConnectionManager2$ConnectionManagerProxy.allocateConnection(BaseConnectionManager2.java:842)
at org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:88)
at com.hp.np.dao.NPDBConnectionManager.getDSConnection(NPDBConnectionManager.java:85)
Any idea about the Warning messages we received.
Regards,
Jaya

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