The registration.jsp file should be in the base directory of the war, not within WEB-INF/classes. Files within WEB-INF and not accessible via URL.
Based on your pom.xml, I suspect that you did not create a web app project. Your JSP should be at src/main/webapp/registration.jsp. Then if the packaging type in the pom.xml is war, the WAR file will contain the JSP in the correct location. This is just a guess based on the WAR file contents, I would really need to see the complete pom.xml to know better.