Servlets can't access Oracle9i database - not sure why?

Hi there,
I got an error when it throws a SQLException in my Internet Explorer.
Error:
======
SQLException: Io exception: The Network Adapter could not establish the connection
Is it bcs i uses scott/tiger?
I places classes12.zip into c:\oraclejdbc
and place this in my classpath:
.;c:\oraclejdbc\classes12.zip;
*Note: I places classes12.jar (also can't work)
Then for a backup reason
I go to C:\Tomcat5\common\classes
and extract the classes12.zip in there
i can see javax and oracle folders
Then.. i make sure in my java codes (no compile error)
java:oracle:thin@wenching:1521:wenching
i was pointing to the right pc name and oracle server ID.
Then i call my servlets into my j2me phone...
it display all the necessary information.. on the data that should be extracted from the oracle 9i database.. display java.sql.SQLException...
There are something wrong?
Can you tell me what i left out? My servlets are working fine?
But i had 2 java files...
WebPage.java calls OracleConn.java
and in web.xml
i only point to WebPage.class and nothing to do with OracleConn (it is just connection classes).
Any help, please?
I also use lots of ways like placing classes12.zip or classes12.jar into many types of folders? Just not sure why cannot?
I did not use the build in Tomcat for Oracle, but the latest Tomcat 5 series. The servelts works fine but not oracle. Could it be this problem? Like allowing which oracle database to call which web server?
Thanks.

It works?
After i try this and that.
I just notice 1 thing...
The database is not connected physically.. even i can sql plus.. it!
So i go to Oracle Database Admnistrator for Windows NT..
and connect my servername WenChing..
and now it works.. servlets can connect to oracle...
Hooray!
I hope it stills work when i reboot my machine.. coz i had no idea what i did... :)
Sounds funny isn't it?
Regards.
Chua Wen Ching :p

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Servlets can't access Oracle9i database - not sure why?

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