The question isn't clear based on my understanding ,I would try to give Solution.
I'm assuming that the issue persists in how you redirect page one to another.IF you Right Click-->Run File(JSP) it will surely run.
But when going from JSP to Another JSP you might face some issue.
--> WebContent/Admin/File1.jsp
---> WebContent/File2.jsp
Consider that if you are going :File2.jsp -->File1.jsp
Then the code should be in File2.jsp
<%@ page isELIgnored="false"%> // Add this on Top of your JSP
<a href="${pageContext.request.contextPath}/Admin/File1.jsp">Admin Page</a>
Refer--> What does this expression language ${pageContext.request.contextPath} exactly do in JSP EL?