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Rajiii How to solve System.NullPointerException: Attempt to de-reference a null object
Hi,
I created Page for custom save controller. my page apex code given below...
<apex:page controller="newOpportunityController11" tabStyle="Account">
<apex:form >
<apex:pageBlock title="Congratulations">
<apex:inputField value="{!Invoice.Name}"/>
<apex:inputField value="{!Invoice.Line_Item__c}"/>
<apex:inputField value="{!Invoice.Pay_by_Date__c}"/>
<apex:inputField value="{!Invoice.Total_Amount__c}"/>
<apex:inputField value="{!Invoice.Client_Name__c}"/>
<apex:inputField value="{!Invoice.Invoice_Status__c}"/>
<apex:commandButton action="{!save}" value="Save"/>
<apex:commandButton action="{!cancel}" value="Cancel"/>
</apex:pageBlock>
</apex:form>
</apex:page>
and my apex class is...
public class newOpportunityController11
{
Opportunity opportunity;
public Invoice__c invoice{ get; set; }
public Opportunity getOpportunity() {
//if(opportunity == null) opportunity = new Opportunity();
return opportunity;
}
public Invoice__c getinvoice() {
//if(Invoice == null) Invoice = new Invoice__c();
Id id = ApexPages.currentPage().getParameters().get('id');
invoice= [SELECT Client_Name__c,Invoice_Status__c,Line_Item__c,Pay_by_Date__c,Total_Amount__c FROM Invoice__c WHERE id = :id];
return invoice;
}
public PageReference cancel() {
PageReference opportunityPage = new ApexPages.StandardController(opportunity).view();
opportunityPage.setRedirect(true);
return opportunityPage;
}
public PageReference save()
{
update invoice;
return null;
}
}
the above page and class was successfully save without error... and then when i run this page and enter the data then click save button the error given below error is occur...
System.NullPointerException: Attempt to de-reference a null object
Class.newOpportunityController11.save: line 47, column 8 External entry point
How to solve this....pls help
Hi Friend,
I can see the code well written, but to run this code sucessfully you need to some chages on it.
first
define standardcontroller attribute on page tag ie "standandcontroller=Invoice__c"
Second
define extension attribute on page tag ie "extension=newOpportunityController11"
thats it, it will work........
Thanks & Regards,
All Answers
What is line 47 in your class? I don't see it here. Make sure that variable/object you are using in that line is not null (check before you call any method over that variable/object).
This error comes when you are getting null value.Check by using system.debug in controller and track your code.
Make sure you pass record Ids to the page.
It may be because you are returning a null PageReference on your save method, surely you need to return a reference to the opportunity?
Add a class constructor
public newOpportunityController11(){
}
Assuming the Id is being passed through the URL .
I can't see where getInvoice is being called to intialise the Invoice variable so use the Class constructor. Also you have public Invoice__c invoice{ get; set; } and getInvoice, you can't have both. It should be either public Invoice__c invoice; then getInvoice will execute.
hi,
try this.
ublic class newOpportunityController11
{
Opportunity opportunity;
public Invoice__c invoice{
get
{
//if(Invoice == null) Invoice = new Invoice__c();
String strId = ApexPages.currentPage().getParameters().get('id');
invoice= [SELECT Client_Name__c,Invoice_Status__c,Line_Item__c,Pay_by_Date__c,Total_Amount__c FROM Invoice__c WHERE id = :strId];
return invoice;
}
set; }
public Opportunity getOpportunity() {
//if(opportunity == null) opportunity = new Opportunity();
return opportunity;
}
/**
public Invoice__c getinvoice() {
//if(Invoice == null) Invoice = new Invoice__c();
Id id = ApexPages.currentPage().getParameters().get('id');
invoice= [SELECT Client_Name__c,Invoice_Status__c,Line_Item__c,Pay_?by_Date__c,Total_Amount__c FROM Invoice__c WHERE id = :id];
return invoice;
}
*/
public PageReference cancel() {
PageReference opportunityPage = new ApexPages.StandardController(opportunity).view();
opportunityPage.setRedirect(true);
return opportunityPage;
}
public PageReference save()
{
update invoice;
return null;
}
}
make sure the variable id you pass in URL is not null.
when you direct bind an object instance using property to visualforce page and if instance get null value than it through
exception,now for this use list type and than bind using property, nullPointer Exception will remove. Or Use property
1.Change your variable name from id to idVal or something else. Id is a reserved keyword in salesforce.
2.Remove your getInvoice() method as you already have a getter property public Invoice__c invoice{ get; set; }.
3.Put the logic of getInvoice() method to constructor.
Hi Friend,
I can see the code well written, but to run this code sucessfully you need to some chages on it.
first
define standardcontroller attribute on page tag ie "standandcontroller=Invoice__c"
Second
define extension attribute on page tag ie "extension=newOpportunityController11"
thats it, it will work........
Thanks & Regards,
i have a below code i am getting the error:
System.NullPointerException: Attempt to de-reference a null object at line 66
global class Match implements Database.Batchable<sObject>{
global Database.QueryLocator start(Database.BatchableContext BC){
String query = 'SELECT Name, Id, test__c, opportunity__c, test1__c FROM pro__c ';
return Database.getQueryLocator(query);
}
global void execute(Database.BatchableContext BC, List<pro__c> planProjects){
Map<String,List<task__c>> taskw = new Map<String,List<task__c>>();
Map<String,List<milest>> milestW = new Map<String,List<milest>>();
List<String> ppIds = new List<String>();
for(pro__c pp : planProjects){
ppIds.add(pp.Id);
}
List<task__c> Tractas = [SELECT Id,Name,Tracker__r.TrP__r.pro__c,Status__c,
Comments__c,Completed_Date__c
FROM task__c
WHERE Tracker__r.TrP__r.pro__c in :ppIds];
for(task__c tt : Tractas){
List<task__c> taskl = new List<task__c>();
if(taskw.containsKey(tt.Tracker__r.TrP__r.pro__c)){
taskl = taskw.get(tt.Tracker__r.TrP__r.pro__c);
}
taskl.add(tt);
taskw.put(tt.Tracker__r.TrP__r.pro__c,taskl);
}
List<milest> milest= [SELECT Id,Name,Status__c,Comments__c,Date__c,pro__c
FROM milest
WHERE pro__c in :ppIds];
for(milest milestone : milest){
List<milest> mileList = new List<milest>();
if(milestW.containsKey(milestone.pro__c)){
mileList = milestW.get(milestone.pro__c);
}
mileList.add(milestone);
milestW.put(milestone.pro__c,mileList);
}
List<task__c> tasksToUpdate = new List<task__c>();
LIst<MilestoneMapping__c> mappingRecords = MilestoneMapping__c.getall().values();
Map<String,String> milestoneMap = new Map<String,String>();
for(MilestoneMapping__c mappingRec : mappingRecords){
milestoneMap.put(mappingRec.Task_Name__c, mappingRec.Milestone_Name__c);
}
for(String ppId : taskw.keyset()){
for(task__c tt : taskw.get(ppId)){
String milestoneMappinName = milestoneMap.get(tt.Name);
----> for(milest mile :milestW.get(ppId) ){
if(mile.Name == milestoneMappinName){
tt.Status__c = mile.Status__c;
tt.Comments__c = mile.Comments__c;
tt.Completed_Date__c = mile.Date__c;
tasksToUpdate.add(tt);
}
}
}
}
if(!tasksToUpdate.isEmpty()){
update tasksToUpdate;
}
}
can anyone please help me to get rid of this error