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Error 500 Java.lang.numberformatexception

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up HTTP Status 500 - java.lang.NumberFormatException: null up vote 0 down vote favorite I am creating a standard dynamic web project including a Servlet, a filter to filter the request and jsp pages. I am taking the number of books from the welcome.jsp and depending on the count I am populating the input boxes on the add.jsp. I want to filter the data coming through the add.jsp. When I verify data through Regex, its showing me error. Also is my flow correct i.e. from the start FILTER --> CONTROLLER --> FILTER --> PAGE and so on??? Error: java.lang.NumberFormatException: null full trace is like: HTTP Status 500 - java.lang.NumberFormatException: null type Exception report message java.lang.NumberFormatException: null description The server encountered an internal error that prevented it from fulfilling this request. exception org.apache.jasper.JasperException: java.lang.NumberFormatException: null org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) javax.servlet.http.HttpServlet.service(HttpServlet.java:728) com.filter.RequestFilter.doFilter(RequestFilter.java:107) root cause java.lang.NumberFormatException: null java.lang.Integer.parseInt(Unknown Source) java.lang.Integer.parseInt(Unknown S

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up HTTP Status 500 - Exception occuring at string to int http://stackoverflow.com/questions/14995313/http-status-500-java-lang-numberformatexception-null conversion up vote -1 down vote favorite Environment : I am working in eclipse kepler, my MySQL database is on AWS RDS. My aim is to create a web based project hence my project is of "AWS Java Web Project". Also for database connectivity i have already added the mysql-connector-*-bin.jar file to my build path. The below code when i run as a simple java application, it runs fine, http://stackoverflow.com/questions/25114994/http-status-500-exception-occuring-at-string-to-int-conversion but when i run it on Tomcat server it shows me the following errors : org.apache.jasper.JasperException: An exception occurred processing JSP page /WelcomeCustomer.jsp at line 114 line 114 : String s_id_string=(String)request.getParameter("s_id"); int s_id = Integer.parseInt(s_id_string); root cause java.lang.NumberFormatException: null java.lang.Integer.parseInt(Unknown Source) java.lang.Integer.parseInt(Unknown Source) org.apache.jsp.WelcomeCustomer_jsp._jspService(WelcomeCustomer_jsp.java:180) line 180 : o_insert.setString(4, Cust_contact_string); Note: Cust_contact_string is of type string. Please help me i cnt seem to get through this error! Thanks in advance updating :

Choose a Shop from above by entering the respective s_id :
<% String s_id_string=(String)request.getParameter("s_id"); int s_id = Integer.parseInt(s_id_string); %> java mysql eclipse jsp amazon-rds share|improve this question edited Aug 4 '14 at 9:18 asked Aug 4 '14 at 8:57 user3868051 61112 for more reference i am pasting the entire code : –user3868051 Aug 4 '14 at 8:58 You cannot parse null into a number. So be sure whether null or not before conversion (parsing). –Wundwin Born Aug 4 '14 at 9:01 yes i am checking that it is not null through a javascript code as below : function s_id_form() { var s_id = document.s_id_form.s_id; if(s_id.value == "") { window.alert("Enter the Shop

Site Careers Other all forums Forum: JSP Http 500 and NumberFormatException https://coderanch.com/t/488912/JSP/java/Http-NumberFormatException Peyyety Avinash Greenhorn Posts: 19 posted 6 years ago http://www.java-forums.org/new-java/65302-http500.html Heres the page2.jsp (not much jsp )

Name Age Button
Heres the Request Dispatcher Servlet: package rrsPackage; import java.io.IOException; import java.io.PrintWriter; import error 500 javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class reqDispServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { PrintWriter pw=response.getWriter(); String s1=request.getParameter("Name"); String s2=request.getParameter("Age"); int num1=Integer.parseInt(s1); int num2=Integer.parseInt(s2); error 500 java.lang.numberformatexception int ss=num1+num2; String sum=String.valueOf(ss); request.setAttribute("nn", sum); RequestDispatcher dispatch=request.getRequestDispatcher("page4"); dispatch.forward(request,response); pw.println("sd"); } } Heres the page4.jsp: (not much jsp ) <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> Insert title here

Confirmed !! Print this thats it !

LinkBack URL About LinkBacks Thread Tools Show Printable Version Email this Page… Subscribe to this Thread… Search Thread Advanced Search Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 11-19-2012,10:20 AM #1 sachi89 Member Join Date Nov 2012 Posts 3 Rep Power 0 http500 HTTP Status 500 - type Exception report message description The server encountered an internal error () that prevented it from fulfilling this request. exception java.lang.NumberFormatException: For input string: "" java.lang.NumberFormatException.forInputString(Unk nown Source) java.lang.Integer.parseInt(Unknown Source) java.lang.Integer.parseInt(Unknown Source) myPack.SaveServlet.doGet(SaveServlet.java:38) javax.servlet.http.HttpServlet.service(HttpServlet .java:617) javax.servlet.http.HttpServlet.service(HttpServlet .java:717) note The full stack trace of the root cause is available in the Apache Tomcat/6.0.35 logs. Apache Tomcat/6.0.35 This is wat i get while running the project.im postin the codes here..... form Java Code: <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> Form

First Name:
Last Name:
Email ID:
Phone number:
Address:
Purchasing Item:
Payment Mode:
 

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