404 error while running project on Eclipse Europa EE. using JBoss(4.2).

i am new at using Eclipse-IDE(Europa) and JBoss(version 4.2) and i tried running the project which was working fine on NetBeans i converted it to Eclipse standards but when i run the project it shows 404 resource not available error..
it's description is as:
type Status report
message /Project_name/index.jsp
description The requested resource (/Project_name/index.jsp/) is not available.
Attachment 792
please help me out with this.
thanx a lot in advance.. :)