http://localhost:8080 is requesting your username and password

after you startup your tomcat,  you type a concrete request url  in broswer, the tomcat probably will prompt you the subsequent message.

it is because the <security-constraint> will restrict the access and in need of authentication.

please comment the following tags named security-constraint in web.xml file of directory WEB-INF of your webapp. it will help you to solve the issue.