For Running The Serlet(.java) File Try These Url
"http://127.0.0.1:8080/servlets-examples\servlet\Hello"
The Problem is U Don't Not Use
WEB-INF\CLASSES
in Your Url
For Servlet Running U Need To Give The New Created Folder (in Your Case
servlet-examples).Then Put Your Servlet .class File in
WEB-INF/classes
Then Use The Above Url You'll Get The Result