Can you post your folder structure?
If you are trying to deploy a basic struts application, you must configure the deployment assembly for the web app and make the jars available for it to run time.
Not sure how to configure deployment assembly. Also, this doesn't look like a jar not available issue. Can you please elaborate more?
Following is the folder structure:
And the same ear works fine for JBoss4.
You can check the link on how to configure the deployment assembly.
But when you say it works in Jboss 4, that is weird.
Can you just unzip the ear and make sure everything inside is build properly