System.NullPointerException: Attempt to de-reference a null object

Question

I am getting this error when I am running my visualforce page

Below is my apex extension class: public with sharing class ExtensionAccount {

    public ExtensionAccount(ApexPages.StandardController controller) {

    }
    private final Account acct;  

    // The constructor passes in the standard controller defined
    // in the markup below
    public ExtensionAccount(ApexPages.StandardSetController controller) {
        this.acct = (Account)controller.getRecord(); 
    }    

    public ApexPages.StandardSetController TaskRecords {
        get {
            if(TaskRecords == null) {
                TaskRecords = new ApexPages.StandardSetController(
                    Database.getQueryLocator([SELECT AccountId FROM Task Where WhatId IN 
                        (Select id From Opportunity Where AccountId = :acct.Id)]));
            }
            return TaskRecords ;
        }
        private set;
    }
    public List<Task> getTaskList() {
         return (List<Task>) TaskRecords.getRecords();
    }  
}

Visualforce page

<apex:page standardController="Account" extensions="ExtensionAccount" sidebar="false"> 
<apex:pageBlock title="Opportunity"> 
<apex:pageBlockSection > 
<apex:dataList value="{!TaskList}" var="task" type="1"> {!task.accountid} </apex:dataList> 
</apex:pageBlockSection> 
</apex:pageBlock> 
</apex:form> 
</apex:page>

Account should be initialized in constructor. And from where are you getting acct.Id? — Ysr Shk
– Ysr Shk, Commented Feb 13, 2016 at 10:21
<apex:page standardController="Account" extensions="ExtensionAccount" sidebar="false"> <apex:pageBlock title="Opportunity"> <apex:pageBlockSection > <apex:dataList value="{!TaskList}" var="task" type="1"> {!task.accountid} </apex:dataList> </apex:pageBlockSection> </apex:pageBlock> </apex:form> </apex:page> — Rachit Joshi
– Rachit Joshi, Commented Feb 13, 2016 at 10:23

Ratan Paul · Accepted Answer · 2016-02-13 11:03:09Z

0

Since you are using single account id then add this.acct = (Account)controller.getRecord(); in your StandardController

public ExtensionAccount(ApexPages.StandardController controller) {
       this.acct = (Account)controller.getRecord(); //Add this line
    }
    private final Account acct;  

    // The constructor passes in the standard controller defined
    // in the markup below
    public ExtensionAccount(ApexPages.StandardSetController controller) {
        this.acct = (Account)controller.getRecord(); 
    }

Edit

 public ExtensionAccount(ApexPages.StandardController controller) {
      this.acct = (Account)controller.getRecord();
    }
    private final Account acct;  

    // The constructor passes in the standard controller defined
    // in the markup below
    public ExtensionAccount(ApexPages.StandardSetController controller) {
        this.acct = (Account)controller.getRecord(); 
    }    


    public List<Task> getTaskList() {
         return [SELECT AccountId FROM Task Where WhatId IN (Select id From Opportunity Where AccountId = :acct.Id)];
    }  
}

edited Feb 13, 2016 at 11:03

answered Feb 13, 2016 at 10:43

Ratan Paul

22.9k14 gold badges59 silver badges100 bronze badges

The error is gone.

Rachit Joshi
– Rachit Joshi

2016-02-13 10:47:45 +00:00
Commented Feb 13, 2016 at 10:47
Visualforce Error Help for this Page List controllers are not supported for Task

Rachit Joshi
– Rachit Joshi

2016-02-13 10:48:01 +00:00
Commented Feb 13, 2016 at 10:48
now i am geting this error

Rachit Joshi
– Rachit Joshi

2016-02-13 10:48:45 +00:00
Commented Feb 13, 2016 at 10:48
Error: Compile Error: Method does not exist or incorrect signature: Database.Query(List<Task>) at line 16 column 17

Rachit Joshi
– Rachit Joshi

2016-02-13 11:01:03 +00:00
Commented Feb 13, 2016 at 11:01
1

Thanks. I was just trying to compare my class with the one you create

Rachit Joshi
– Rachit Joshi

2016-02-13 12:28:00 +00:00
Commented Feb 13, 2016 at 12:28

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