NullFormatException : Null

[ganesh dengale]

from my J2me Code I am accessing a servlet but i'm facing above error.

My J2me & Servlet Code Snippets are as follow..

J2me Code Snippet

String custName_collection="";
String invoiceNo_collection="";
String amount_collection="";
String instrumentType_collection="";
String bankName="";
String instNo="";
 
 
 else if (c==cmd_ok && disp==collection_dtls_Form)
         {
           custName_collection=Txt_custName.getString();
           invoiceNo_collection=Txt_invoiceNo.getString();
           amount_collection=Txt_amountCollect.getString();
           int i=instrumentType.getSelectedIndex();
           instrumentType_collection=instrumentType.getString(i);
           System.out.println("instrumentType_collection  "+instrumentType_collection);
          /* 
           if (instrumentType_collection_dtls_Form=="Cash")
             {
                criteria="CollectionDetails";
                       //                  <a href="http://localhost:8080/examples/collectionDetails?customerField=Prashant&invoiceField=01&amountField=5000&instrumentField=Cash" target="_blank" rel="nofollow">http://localhost:8080/examples/collectionDetails?customerField=Prashant&invoiceField=01&amountField=5000&instrumentField=Cash</a>  
                ConnectionManager.str_Url="http://localhost:8080/examples/collectionDetails?customerField="+Str_custName+"&invoiceField="+Str_invoiceNo+"&amountField="+Str_amount+"&instrumentField="+Str_instrumentType;  
                System.out.println("before get data");
                ConnectionManager.getData();
                   
             } */ 
           Str_custName.setText(custName_collection);
           Str_invoiceNo.setText(invoiceNo_collection);
           Str_amount.setText(amount_collection);
           Str_instrumentType.setText(instrumentType_collection);
           
           
           if(instrumentType_collection=="Cash")
               {
                   confirmation_Form.append(Str_custName);
                   confirmation_Form.append(Str_invoiceNo);
                   confirmation_Form.append(Str_amount);
                   confirmation_Form.append(Str_instrumentType);
                   confirmation_Form.addCommand(cmd_ok);
                   confirmation_Form.addCommand(cmd_cancel);
                   fDisplay.setCurrent(confirmation_Form);
               }             
           else
              {
                  Str_instType_instrument_detail_Form.setText(instrumentType_collection);
                  
                  instrument_detail_Form.append(Str_instType_instrument_detail_Form);
                  instrument_detail_Form.append(Txt_instrumentNo);
                  instrument_detail_Form.append(Str_instDate_instrument_detail_Form);
                  instrument_detail_Form.append(Txt_bankName);
                  
                  bankName=Txt_bankName.getString();
                  instNo=Txt_instrumentNo.getString();
                  
                  fDisplay.setCurrent(instrument_detail_Form);
                  
              }
           
         }
 
 
 
 
  else if (c==cmd_ok && disp==confirmation_Form)
         {
            if (instrumentType_collection=="Cash")
             {
                System.out.println("invoiceNo_collection  "+invoiceNo_collection);
                //int invoice=Integer.parseInt(invoiceNo_collection);
                System.out.println("amount_collection  "+amount_collection);
               // int amount=Integer.parseInt(amount_collection);
                System.out.println("instrumentType_collection  "+instrumentType_collection);
                System.out.println("instNo  "+instNo);
                System.out.println("bankName  "+bankName);
                System.out.println("custName_collection   "+custName_collection);
                criteria="CollectionDetails";
                       //                  <a href="http://localhost:8080/examples/collectionDetails?customerField=Prashant&invoiceField=01&amountField=5000&instrumentField=Cash" target="_blank" rel="nofollow">http://localhost:8080/examples/collectionDetails?customerField=Prashant&invoiceField=01&amountField=5000&instrumentField=Cash</a>  
                ConnectionManager.str_Url="http://localhost:8080/examples/collectionDetails?customerField="+custName_collection+"&invoiceField="+invoiceNo_collection+"&amountField="+amount_collection+"&instrumentField="+instrumentType_collection;
                //System.out.println("before get data");
                ConnectionManager.getData();
             }
            else
              { 
                
                                     //     <a href="http://localhost:8080/examples/collectionDetails?customerField=amit&invoiceField=777&amountField=700&instrumentField=Cash&instNoField=707&bankNameField=dena+bank" target="_blank" rel="nofollow">http://localhost:8080/examples/collectionDetails?customerField=amit&invoiceField=777&amountField=700&instrumentField=Cash&instNoField=707&bankNameField=dena+bank</a>
                       //                   <a href="http://localhost:8080/examples/collectionDetails?customerField=rahul&invoiceField=1234&amountField=7400&instrumentField=cheque&instNoField=111111&bankNameField=dena+bank" target="_blank" rel="nofollow">http://localhost:8080/examples/collectionDetails?customerField=rahul&invoiceField=1234&amountField=7400&instrumentField=cheque&instNoField=111111&bankNameField=dena+bank</a>  
                ConnectionManager.str_Url="http://localhost:8080/examples/collectionDetails?customerField="+custName_collection+"&invoiceField="+invoiceNo_collection+"&amountField="+amount_collection+"&instrumentField="+instrumentType_collection+"&instNoField="+instNo+"&bankNameField="+bankName;
                ConnectionManager.getData();
                    
              } 
         } 
 

Servlet Code snippet

import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
 
public class CollectionDetails extends HttpServlet
{
    public void doGet(HttpServletRequest request,HttpServletResponse response)throws IOException,ServletException
  {
    try{ 
     response.setContentType("Text/HTML");
/* String b = request.getParameter("invoiceField");
 int invoiceNo=Integer.parseInt("b");
 String a = request.getParameter("amountField");
             int amount=Integer.parseInt("a");*/
  
 int invoiceNo=Integer.parseInt(request.getHeader("invoiceField"));
             int amount=Integer.parseInt(request.getHeader("amountField"));
             
            // int invoiceNo=request.getIntHeader("invoiceField");
            // int amount=request.getIntHeader("amountField");   
 
 String custmrName=request.getParameter("customerField");
             String instrumentType=request.getParameter("instrumentField"); 
 PrintWriter out=response.getWriter(); 
               
           if(instrumentType=="Cash")  
      {
                 String sql = "INSERT INTO Collection(INCD, CustName, Amount, PayType) VALUES (?,?,?,?)";
                 Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
     java.sql.Connection connection=java.sql.DriverManager.getConnection("jdbc  :-o	  dbc:FFAdsn");
     java.sql.Statement statement=connection.createStatement();
                 PreparedStatement ps = connection.prepareStatement(sql); 
                                             
     ps.setInt(1, invoiceNo);
             ps.setString(2, custmrName);
                 ps.setInt(3, amount);
     ps.setString(4, instrumentType);
             ps.executeUpdate();
              }
           else 
      {  
                 String bankName=request.getParameter("bankNameField");
 int instNo=Integer.parseInt(request.getParameter("instNoField"));
 //String invoiceDate=request.getparameter("")
 String sql1 = "INSERT INTO Collection(INCD,INSNO, CustName, Amount, PayType,BankName) VALUES (?,?,?,?,?,?)";
                 Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
     java.sql.Connection connection=java.sql.DriverManager.getConnection("jdbc  :-o	  dbc:FFAdsn");
     java.sql.Statement statement=connection.createStatement();
                 PreparedStatement ps = connection.prepareStatement(sql1); 
                                             
     ps.setInt(1, invoiceNo);
 ps.setInt(2, instNo);
             ps.setString(3, custmrName);
                 ps.setInt(4, amount);
     ps.setString(5, instrumentType);
 ps.setString(6,bankName);
             ps.executeUpdate();
              } 
 
 out.println("<HTML><HEAD><TITLE>Records Retrive</TITLE></HEAD>");
             out.println("<BODY>");
 /*
 while(rs.next())
          {
                     //SELECT Job.JCD, Status.Name, WorkOrder.Remarks, User.UCD 
 
                     jobId=rs.getString("JCD");
             status=rs.getString("Name");
             remark=rs.getString("Remarks");
          }
             out.println("job id "+jobId+"\t");
 out.print("\n"+"Status "+status);
 out.print("\n"+"Remark "+remark);
 
 response.setHeader("jobId",jobId);
 response.setHeader("Status",status);
 response.setHeader("Remark",remark); */
 out.println("Record Updated Sucessfully");
             out.println("</BODY></HTML>");
   
   }catch(java.sql.SQLException sq){
               
          sq.printStackTrace();
       
   }catch(Exception s){
 
     s.printStackTrace();
      }
 
  }
 
 public void doPost( HttpServletRequest request,HttpServletResponse response) throws IOException,ServletException
      {
 
        this.doGet(request,response);
 
      }
 
}

[BSouther: Added UBB CODE tags]
[ March 30, 2007: Message edited by: Ben Souther ]

[Paul Sturrock]

Look at the line the exception is being thown at. An object reference in that line points to null.

[ganesh dengale]

sorry i couldnot get what you want to say

[ganesh dengale]

Error I got is as follows

Starting service Tomcat-Standalone
Apache Tomcat/4.0.1
Starting service Tomcat-Apache
Apache Tomcat/4.0.1
java.lang.NumberFormatException: null
        at java.lang.Integer.parseInt(Unknown Source)
        at java.lang.Integer.parseInt(Unknown Source)
        at CollectionDetails.doGet(CollectionDetails.java:18)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:247)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:193)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:243)
        at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
.java:566)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:472)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
 
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:201)
        at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
.java:566)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authentica
torBase.java:472)
        at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
.java:564)
        at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve
.java:246)
        at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
.java:564)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:472)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
 
        at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:
2344)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:164)
        at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
.java:566)
        at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatche
Valve.java:170)
        at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
.java:564)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:170)
        at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
.java:564)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:
462)
        at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
.java:564)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:472)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
 
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:163)
        at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
.java:566)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:472)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
 
        at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcesso
r.java:1011)
        at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.ja
va:1106)
        at java.lang.Thread.run(Unknown Source)

[Paul Sturrock]

java.lang.NumberFormatException

This is thrown from Integer.parseInt(String) when the value you try to parse cannot be interpreted as an integer. Look at the code on line 18 of your CollectionDetails servlet and check the value you are trying to parse is not null and a parsable value (i.e. its not a letter or a floating point number, or some other non-numeric character)