The Network Adapter could not establish the connection in application server logs

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Below errors are reported in the Oracle Application Server logs :-

2010-02-02 08:17:29,832> <::> Io exception: The Network Adapter could not establish the connection
java.sql.SQLException: Io exception: The Network Adapter could not establish the connection
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:138)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:175)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:287

10/02/02 08:17:29 ERROR: exception symbol "09732" not found in resource file.
<2010-02-02 08:17:29,831> <::> Io exception: The Network Adapter could not establish the connection
java.sql.SQLException: Io exception: The Network Adapter could not establish the connection
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:138)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:175)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:287)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:328)

10/02/02 08:33:34 ORABPEL-03001
Cannot lookup datasource type.
The process domain was unable to determine the database type. The version table contains the vendor type for the current datasource. The exception reported is: Cannot fetch a datasource connection.
The process domain was unable to establish a connection with the datasource with the connection URL "jdbc/BPELServerDataSourceWorkflow". The exception reported is: Io exception: The Network Adapter cou
ld not establish the connection
Please check that the machine hosting the datasource is physically connected to the network. Otherwise, check that the datasource connection parameters (user/password) is currently valid.
Please check that:
+ the machine hosting the datasource is physically connected to the network.
+ the connection pool properties as defined in the application server startup properties are valid.
+ the database schema for OraBPEL has been installed in the datasource.

Solution :-

1) Check whether the database is up and running.
2) Check database listener is up or not.
3) After making both the things up , restart all oc4j containers.
4) Issue will get resolved.

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