Oracle 9i JDBC configuration failure?

Question

I am testing some Java servlet (run over tomcat container) which needs to access the Oracle DB installed on the same Solaris server.
It works well with Oracle 8i, and we then install the program on another Oracle 9i server.
when we set up the DB and use SQL *Plus to access the DB it works-- and when running netstat on Solaris-- the port 1521 is not open-- that is the default port for JDBC, and it should be open.
My java program shows the following error
java.sql.SQLException
: Io exception: The Network Adapter could not establish the connection
As port 1521 is not open at all so the servlet running on the same machine can't access it.
Could you kindly help give advice --- on 9i, how shall I check the setting to make sure JDBC is well configured and ready for use? A thousand thanks

Answer 1

Hi Li,
You don't have to do a netstat to check for the port. Use the lsnrctl utility. Its found in ORACLE_HOME/bin directory.
Listener is the program which recieves all the requests to database and sends it to Oracle for processing, and returns the results back.
$lsnrctl status
-- this will show if the Listener is running or not
$lsnrctl start
-- this will start the listener in the port specified in ORACLE_HOME/network/admin/listener.ora
$lsnrctl stop
-- stop the listener
If your listener is not running, start the listener and try connecting.
If your listener is not running, then you cann't connect even using sqlplus.
Elango.