JSP error 404 where is my mistake

Question

My JSP gives error 404 when I run Can anybody help me to find where is my mistake? I created jsp page that takes request parameter(background colors) and respond. I needed to call method from java class. I ALSO PLACED MY JSP PAGE IN WEB-INF Folder.Here is my code.

     <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ page import="com.java.MyJsp"%>
     <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
   "http://www.w3.org/TR/html4/loose.dtd">
   <html>
   <head>
  <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <title>Insert title here</title>
 </head>
 <body>
 <form action="./myjsp.jsp">
 <input type="radio" name="color" value="color1" > Yellow<br>
 <input type="radio" name="color"  value="color2"> White<br>
 <input type="radio" name="color"  value="color3"> Gray<br>

 <input type="submit"  value="go">
 </form>

        <% String colors[]=request.getParameterValues("color");
        for(int i=0;i<colors.length;i++){
       if(colors[i].equals("")||colors[i]==null){ %>
        <body style="background-color:<%=com.java.Myjsp.myColor() 
        %>;">
      <% }


      if(colors[i].equals("yellow")){

    out.println("<html> <style> body{background-color:yellow;} </style>
   </html>");
     }
   if(colors[i].equals("white")){

       out.println("<html> <style> body{background-color:white;} </style>
   </html>");
   }
    if(colors[i].equals("gray")){

        out.println("<html> <style> body{background-color:gray;} </style>
        </html>");
       }
      }
       %>

    </body>
    </html>

how you access your jsp page in browser ? – Mohsin AR Apr 22 '17 at 10:44 — Mohsin AR, Apr 22 '17 at 10:44
I just run on server on eclipse ee – user245548 Apr 22 '17 at 10:45 — user245548, Apr 22 '17 at 10:45
post your server code and `url` you are accessing to – Mohsin AR Apr 22 '17 at 10:45 — Mohsin AR, Apr 22 '17 at 10:45
I placed my JSP page in web INF can it be a reason? – user245548 Apr 22 '17 at 10:46 — user245548, Apr 22 '17 at 10:46
http://localhost:9342/MyProject/WEB-INF/MyJSP.jsp – user245548 Apr 22 '17 at 10:47 — user245548, Apr 22 '17 at 10:47
try to access like this localhost:9342/MyProject/MyJSP.jsp – Mohsin AR Apr 22 '17 at 10:48 — Mohsin AR, Apr 22 '17 at 10:48
Exception occured at line 20 whic is for loop – user245548 Apr 22 '17 at 10:52 — user245548, Apr 22 '17 at 10:52
now see the server logs what is happening – Mohsin AR Apr 22 '17 at 10:52 — Mohsin AR, Apr 22 '17 at 10:52
it gives null pointer exception – user245548 Apr 22 '17 at 10:54 — user245548, Apr 22 '17 at 10:54

score 0 · Answer 1 · edited May 23 '17 at 12:34

0

access this url localhost:9342/MyProject/MyJSP.jsp instead localhost:9342/MyProject/WEB-INF/MyJSP.jsp also read link

edited on Null pointer exception:

use if condition as I mentioned

<% String colors[]=request.getParameterValues("color");
    if(colors !=null) {
        for(int i=0;i<colors.length;i++){
       if(colors[i].equals("")||colors[i]==null){ %>
        <body style="background-color:<%=com.java.Myjsp.myColor() 
        %>;">
      <% } 
     } // end of if statement this should be placed after loop block

edited May 23 '17 at 12:34

Community

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answered Apr 22 '17 at 10:54

Mohsin AR

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`colors[]` might be null check by your self or debug it – Mohsin AR Apr 22 '17 at 10:55
you should post your server logs, it would be helpful – Mohsin AR Apr 22 '17 at 11:03
It shows Java.lang Null Pointer Exception at for loop – user245548 Apr 22 '17 at 11:07
read link for handling null pointer exception http://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it – Mohsin AR Apr 22 '17 at 11:08

JSP error 404 where is my mistake

1 Answers1