Cannot test portlet using JDeveloper and built-in OC4J

Hi everybody,
I'm not trying to sound stupid but my problem seems to be very basic but i cannot solve it. I'm new to Jdeveloper. Here's my problem.
I'm using Jdeveloper 10.1.2.1.0 (build 1913) to develope a portlet. I deployed it to the built-in Standalone OC4J of Jdeveloper and got the following messages:
---- Deployment started. ---- Sep 6, 2006 7:46:11 PM
Target platform is Standalone OC4J (AppServerConnection2).
Wrote WAR file to D:\jdev1012\jdev\mywork\Uma_OWHO\Uma\deploy\UmaPortlets.war
Wrote EAR file to D:\jdev1012\jdev\mywork\Uma_OWHO\Uma\deploy\UmaPortlets.ear
Invoking OC4J admin tool...
D:\jdev1012\jdk\jre\bin\javaw.exe -jar D:\jdev1012\j2ee\home\admin.jar ormi://cuongttlabtop/ admin **** -deploy -file D:\jdev1012\jdev\mywork\Uma_OWHO\Uma\deploy\UmaPortlets.ear -deploymentName UmaPortlets
checkIsLocalHost() error: cuongttlabtop/: cuongttlabtop/
Uploading file D:\jdev1012\jdev\mywork\Uma_OWHO\Uma\deploy\UmaPortlets.ear to oc4j server side
Notification ==> Application Deployer for UmaPortlets STARTS [ 2006-09-06T19:46:17.406ICT ]
Notification ==> Undeploy previous deployment
Notification ==> Copy the archive to D:\jdev1012\j2ee\home\applications\UmaPortlets.ear
Notification ==> Unpack UmaPortlets.ear begins...
Notification ==> Unpack UmaPortlets.ear ends...
Notification ==> Initialize UmaPortlets.ear begins...
Notification ==> Initialize UmaPortlets.ear ends...
Notification ==> Initialize UmaPortlets begins...
Notification ==> Initialize UmaPortlets ends...
Notification ==> Application Deployer for UmaPortlets COMPLETES [ 2006-09-06T19:46:19.000ICT ]
Exit status of OC4J admin tool (-deploy): 0
D:\jdev1012\jdk\jre\bin\javaw.exe -jar D:\jdev1012\j2ee\home\admin.jar ormi://cuongttlabtop/ admin **** -bindWebApp UmaPortlets UmaPortlets http-web-site /UmaPortlets
checkIsLocalHost() error: cuongttlabtop/: cuongttlabtop/
Exit status of OC4J admin tool (-bindWebApp): 0
Use the following context root(s) to test your web application(s):
http://cuongttlabtop:8888/UmaPortlets
Elapsed time for deployment: 12 seconds
---- Deployment finished. ---- Sep 6, 2006 7:46:23 PM
When i tried to access the URL: http://cuongttlabtop:8888/UmaPortlets by Mozilla Firefox nothing came up instead : 403 Forbidden Directory browsing not allowed
Please help me everybody!!!!! It's urgent. My boss will check my work on this Friday :((.

I tried to access both URL you gave me and got the error:
404 Not Found
Resource /UmaPortlets/providers not found on this server
I really dont understand what's going wrong here?? I followed exactly what Oracle tutorials tell me :(

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