Re:The JDBC exception in log file

Question

<Jul 1, 2010 1:57:59 AM EDT> <Warning> <JDBC> <BEA-001129> <Received exception while creating connection for pool "xxxDS": Io exception: The Network Adapter could not establish the connection>
<Jul 1, 2010 1:57:59 AM EDT> <Info> <JDBC> <BEA-001156> <Stack trace associated with message 001129 follows:
java.sql.SQLException: Io exception: The Network Adapter could not establish the connection
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:255)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:387)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:420)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:165)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801)
at weblogic.jdbc.common.internal.ConnectionEnvFactory.makeConnection(ConnectionEnvFactory.java:300)
at weblogic.jdbc.common.internal.ConnectionEnvFactory.createResource(ConnectionEnvFactory.java:204)
at weblogic.common.resourcepool.ResourcePoolImpl.makeResources(ResourcePoolImpl.java:1096)
at weblogic.common.resourcepool.ResourcePoolImpl$ResourcePoolMaintanenceTask.timerExpired(ResourcePoolImpl.java:2018)
at weblogic.timers.internal.TimerImpl.run(TimerImpl.java:265)
at weblogic.work.ServerWorkManagerImpl$WorkAdapterImpl.run(ServerWorkManagerImpl.java:518)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:181)

Answer 1

The root cause of this exception is: java.sql.SQLException: Io exception: The Network Adapter could not establish the connection
1. From Weblogic Admin Console, go to this Datasource and TEST the connection and see if it is connecting successfully. May be the Host/Port for the Oracle connection and username/password or SID name may be invalid or wrongly configured.
2. If you have any client to connect to this database like SQL Developer etc, try to connect to that db schema from this tool and see if this works.
3. One more thing. Check the Firewall settings and specially if the DB Port is open on the server where the database is running. In our Env, usually unless we open the port like for Oracle 1521, outsiders or other machines cannot connect to that database either from SQL Developer or from weblogic datasoures. So check for the port not open issues.
4. Last option is if the Network is down and not able to connect to that db server. Check with Network guys.
Thanks
Ravi Jegga