+2  A: 

From the error it appears that there is an issue with permissions - maven does not seem to have permission placing the .war file in tomcat's webapps folder.

Are you on Vista/Windows 7 with UAC turned On?

Raghuram
yes i am using windows 7..But i dont know what is UAC?
javanoob
I googled for UAC an turned it off and now it is working fine..Thanks buddy.
javanoob