NUll POINTER EXCEPTION

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
    {
        float basic = Float.parseFloat(request.getParameter("value1"));
        float da = basic* 0.6f;
        float hra= basic* 0.3f;
        float gross= basic + hra + da;
        request.setAttribute("gr",new  Float(gross));//sharing of data
        RequestDispatcher rd=getServletContext().getRequestDispatcher("/net");
        rd.forward(request,response);

    }

by this block of code i m getting null pointer Exception. can some one please explain what is the problem in this block of code....

View Answers

August 23, 2011 at 5:04 PM

1)grosspay.jsp:

<html>
<form method="get" action="../CalculateSalary">
BASIC: <input type="text" name="value1"><br>
<input type="submit" value="submit"></td></tr>
</table>
</form>
</html>

2)CalculateSalary.java:

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

    public class CalculateSalary extends HttpServlet { 
           public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            response.setContentType("text/html");
            PrintWriter out = response.getWriter();
            float basic = Float.parseFloat(request.getParameter("value1")); 
            float da = basic* 0.6f; 
            float hra= basic* 0.3f;
            float gross= basic + hra + da;
            request.setAttribute("gr",new Float(gross));
            RequestDispatcher rd=getServletContext().getRequestDispatcher("/net"); 
            rd.forward(request,response);
         }
         public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
            this.doPost(request, response);
    }
    }

3)Do Servlet mapping in web.xml:

<servlet>
    <servlet-name>CalculateSalary</servlet-name>
        <servlet-class>CalculateSalary</servlet-class>
    </servlet>
<servlet-mapping>
        <servlet-name>CalculateSalary</servlet-name>
        <url-pattern>/CalculateSalary</url-pattern>
    </servlet-mapping>

4)net.java:

import javax.servlet.*; 
import java.io.*;
import javax.servlet.http.*;

public class net extends HttpServlet {
  public void doGet(HttpServletRequest request,   HttpServletResponse response)  throws ServletException, IOException {
  PrintWriter pw = response.getWriter();
response.setContentType("text/html");
PrintWriter out=response.getWriter();
String st=request.getAttribute("gr").toString();
pw.println("Your Salary is: "+st);
}
}

5)Do servlet mapping in web.xml:

<servlet>
        <servlet-name>net</servlet-name>
            <servlet-class>net</servlet-class>
        </servlet>
    <servlet-mapping>
            <servlet-name>net</servlet-name>
            <url-pattern>/net</url-pattern>
        </servlet-mapping>

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