Problem connecting Mapview to Oracle Database(Add a data source)

Im a neophyte to the mapviewer and Ive run into a very primitive problem. I cant view the sample maps in the mapviewer. I cant connect to the database where I've loaded the sample oracle data (mvdemo.zip) to the database. I have the mapviewer running. Ive checked my tnsnames to confirm the connection used by other oracle application (sql) and confirmed that the spatial files exists on the database.
Below is my platform inform
Platform
For MapView
We have Java- j2se_1.4.2_09
My local system is Microsoft Windows 2000.
Connect to Oracle 9.2.0.4.0 and 10.1.0.3.1 on separate machines
Here is my connection infor:
<?xml version="1.0" standalone="yes"?>
<non_map_request>
<add_data_source
name="mvdemo"
jdbc_host="medea"
jdbc_port="1521"
jdbc_sid="orcl"
jdbc_user="gda_stock"
jdbc_password="!********"
jdbc_mode="thin"
number_of_mappers="3" />
</non_map_request>
Here is the error I received:
<?xml version="1.0" encoding="UTF-8" ?>
<oms_error>Message:[MapperConfig] cannot add map data source. Fri Aug 26 17:28:04 CDT 2005 Severity: 0 Description: at oracle.lbs.mapserver.core.MapperConfig.addMapDataSource(MapperConfig.java:583) at oracle.lbs.mapserver.MapServerImpl.addMapDataSource(MapServerImpl.java:315) at oracle.lbs.mapserver.oms.addDataSource(oms.java:1241) at oracle.lbs.mapserver.oms.doPost(oms.java:409) at javax.servlet.http.HttpServlet.service(HttpServlet.java:760) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:810) at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:322) at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:790) at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:270) at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:112) at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:186) at java.lang.Thread.run(Unknown Source)</oms_error>

Hi, is there anyone here who can help me.....thanks in advance!

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