I am unablle to handle file upload in my jsp project, i am getting errors in my FileUploadServlet.java file.

HttpServletRequest cannot be resolved to a typeJava(16777218) HttpServlet cannot be resolved to a typeJava(16777218) HttpServletResponse cannot be resolved to a typeJava(16777218)

I tried everything possible but still not working, i just want to be able to upload files