I get Null pointer exception Error on VF with Custom SetController extension

public class CaseListCtrl {
    public String s1 {get;set;}
    public String s2 {get;set;}
    public String s3 {get;set;}
    public String s4 {get;set;}
    public String s5 {get;set;}
    public String s6 {get;set;}
    public String s7 {get;set;}
    
    /*List<Case> caseList = [SELECT Id, Labels2__c FROM Case Limit 20];
    
    ApexPages.StandardSetController ssc = new ApexPages.StandardSetController(caseList);*/
    
    private final Case c;
    
    public CaseListCtrl(ApexPages.StandardSetController controller) {
        this.c = (Case)controller.getRecord();
    }
    
    public List <Case> getCases(){
        return [SELECT Id, Labels2__c FROM  Case];
    }
    
    public List<Case> caseRecords {
        get {
            return [SELECT Id, Labels2__c FROM Case];
        }
        private set;
    }
    
    /*public List<Case> getCaseListCtrl() {
        return (List<Case>) caseRecords.getRecords();
    }*/
    
    Public ApexPages.Action getIt(){
        List<List<String>> lstS = new List<List<String>>();
        String[] setS = new List<String>();
        for (integer i = 0; i < 20; i++){
            Case cR = caseRecords[i];
        	lstS.add(cr.Labels2__c.split(';'));
        }
        if (lstS != null){
            for (integer i = 1; i < lstS.size(); i++){
                s1 = lstS.get(i)[0];
                s2 = lstS.get(i)[1];
                s1 = lstS.get(i)[2];
                s2 = lstS.get(i)[3];
                s1 = lstS.get(i)[4];
                s2 = lstS.get(i)[5];
                s1 = lstS.get(i)[6];
                s2 = lstS.get(i)[7];
            }
        }
		return null;
    }
}

<apex:page standardController="Case" recordSetVar="cases" sidebar="true" standardstylesheets="false" showheader="true" extensions="CaseListCtrl" action="{!getIt}">
<apex:form >
    {!s1}
    {!s2}
    {!s3}
    {!s4}
    {!s5}
    {!s6}
    {!s7}

</apex:form>
</apex:page>

My intent is to grab values from a multi-picklist field "labels2__c" and display it as a single value in a visualforce page.

This is the error:

System.NullPointerException: Attempt to de-reference a null object
Error is in expression '{!getIt}' in component <apex:page> in page testctrlcase: Class.CaseListCtrl.getIt: line 40, column 1
Class.CaseListCtrl.getIt: line 40, column 1

Thanks,
Adelchi

February 5, 2017
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Amit Chaudhary 8
Please try to update your code like below
public class CaseListCtrl { public String s1 {get;set;} public String s2 {get;set;} public String s3 {get;set;} public String s4 {get;set;} public String s5 {get;set;} public String s6 {get;set;} public String s7 {get;set;} /*List<Case> caseList = [SELECT Id, Labels2__c FROM Case Limit 20]; ApexPages.StandardSetController ssc = new ApexPages.StandardSetController(caseList);*/ private final Case c; public CaseListCtrl(ApexPages.StandardSetController controller) { this.c = (Case)controller.getRecord(); } public List <Case> getCases(){ return [SELECT Id, Labels2__c FROM Case]; } public List<Case> caseRecords { get { return [SELECT Id, Labels2__c FROM Case]; } private set; } /*public List<Case> getCaseListCtrl() { return (List<Case>) caseRecords.getRecords(); }*/ Public ApexPages.Action getIt(){ List<List<String>> lstS = new List<List<String>>(); String[] setS = new List<String>(); for (integer i = 0; i < 20; i++){ Case cR = caseRecords[i]; if( cr.Labels2__c != null) { lstS.add(cr.Labels2__c.split(';')); } } if (lstS != null){ for (integer i = 1; i < lstS.size(); i++){ s1 = lstS.get(i)[0]; s2 = lstS.get(i)[1]; s1 = lstS.get(i)[2]; s2 = lstS.get(i)[3]; s1 = lstS.get(i)[4]; s2 = lstS.get(i)[5]; s1 = lstS.get(i)[6]; s2 = lstS.get(i)[7]; } } return null; } }

February 5, 2017
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Nishad K
Hi Adelchi,

Try like this :
public class CaseListCtrl { public String s1 {get;set;} public String s2 {get;set;} public String s3 {get;set;} public String s4 {get;set;} public String s5 {get;set;} public String s6 {get;set;} public String s7 {get;set;} /*List<Case> caseList = [SELECT Id, Labels2__c FROM Case Limit 20]; ApexPages.StandardSetController ssc = new ApexPages.StandardSetController(caseList);*/ private final Case c; public CaseListCtrl(ApexPages.StandardSetController controller) { this.c = (Case)controller.getRecord(); } public List <Case> getCases(){ return [SELECT Id, Labels2__c FROM Case]; } public List<Case> caseRecords { get { return [SELECT Id, Labels2__c FROM Case]; } private set; } /*public List<Case> getCaseListCtrl() { return (List<Case>) caseRecords.getRecords(); }*/ Public ApexPages.Action getIt(){ List<List<String>> lstS = new List<List<String>>(); String[] setS = new List<String>(); for (integer i = 0; i < 20; i++){ Case cR = caseRecords[i]; lstS.add(cr.Labels2__c.split(';')); } if (lstS != null){ s1 = lstS[0][0]; s2 = lstS[0][1]; } return null; } }
Please refer the below link :
http://stackoverflow.com/questions/16840732/how-to-write-a-multidimensional-aray-in-apex

Regards,

February 5, 2017
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Adelchi Pelizzo
Thank for your answers. Unfortuntely I am still stuck:
This method gives me:

System.NullPointerException: Attempt to de-reference a null object
Error is in expression '{!getIt}' in component <apex:page> in page testctrlcase: Class.CaseListCtrl.getIt: line 32, column 1
Class.CaseListCtrl.getIt: line 32, column 1

Public ApexPages.Action getIt(){ List<List<String>> lstS = new List<List<String>>(); String[] setS = new List<String>(); if(!casesList.isEmpty()){ for (integer i = 0; i < 20; i++){ Case cR = casesList[i]; lstS.add(cR.Labels2__c.split(';')); } if (lstS != null){ for (integer i = 1; i < lstS.size(); i++){ s1 = lstS.get(i)[0]; s2 = lstS.get(i)[1]; s1 = lstS.get(i)[2]; s2 = lstS.get(i)[3]; s1 = lstS.get(i)[4]; s2 = lstS.get(i)[5]; s1 = lstS.get(i)[6]; s2 = lstS.get(i)[7]; } } } return null; }

I tried also this just to test the function on one returned record from the query in casesList. I get this error instead:

System.ListException: List index out of bounds: 2
Error is in expression '{!getIt}' in component <apex:page> in page testctrlcase: Class.CaseListCtrl.getIt: line 61, column 1
Class.CaseListCtrl.getIt: line 61, column 1

public class CaseListCtrl{ public String s1 {get;set;} public String s2 {get;set;} public String s3 {get;set;} public String s4 {get;set;} public String s5 {get;set;} public String s6 {get;set;} public String s7 {get;set;} private final Case c; public CaseListCtrl(ApexPages.StandardSetController controller) { this.c = (Case)controller.getRecord(); } public List <Case> getCases(){ return [SELECT Id, Labels2__c FROM Case]; } public List<Case> casesList { get { return [SELECT Id, Labels2__c FROM Case]; } private set; } /*Public ApexPages.Action getIt(){ List<List<String>> lstS = new List<List<String>>(); String[] setS = new List<String>(); if(!casesList.isEmpty()){ for (integer i = 0; i < 20; i++){ Case cR = casesList[i]; lstS.add(cR.Labels2__c.split(';')); } if (lstS != null){ for (integer i = 1; i < lstS.size(); i++){ s1 = lstS.get(i)[0]; s2 = lstS.get(i)[1]; s1 = lstS.get(i)[2]; s2 = lstS.get(i)[3]; s1 = lstS.get(i)[4]; s2 = lstS.get(i)[5]; s1 = lstS.get(i)[6]; s2 = lstS.get(i)[7]; } } } return null; }*/ Public ApexPages.Action getIt(){ List<String> lS = new List<String>(); if (!casesList.isEmpty()){ if(casesList.get(0).labels2__c.split(';')[0] != null){ ls.add(casesList.get(0).labels2__c.split(';')[0]); s1 = ls[0]; } if(casesList.get(0).labels2__c.split(';')[1]!=null){ ls.add(casesList.get(0).labels2__c.split(';')[1]); s2 = ls[1]; } if(casesList.get(0).labels2__c.split(';')[2]!=null){ ls.add(casesList.get(0).labels2__c.split(';')[2]); s3 = ls[2]; } if(casesList.get(0).labels2__c.split(';')[3]!=null){ ls.add(casesList.get(0).labels2__c.split(';')[3]); s4 = ls[3]; } if(casesList.get(0).labels2__c.split(';')[4]!=null){ ls.add(casesList.get(0).labels2__c.split(';')[4]); s5 = ls[4]; } if(casesList.get(0).labels2__c.split(';')[5]!=null){ ls.add(casesList.get(0).labels2__c.split(';')[5]); s6 = ls[5]; } if(casesList.get(0).labels2__c.split(';')[6]!=null){ ls.add(casesList.get(0).labels2__c.split(';')[6]); s7 = ls[6]; } } return null; } }

Thanks for your help.
Adelchi

February 7, 2017
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Shot
First of all change for loop to:

for (integer i = 0; i < casesList.size(); i++)

February 7, 2017
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Shot
Also:

public class CaseListCtrl{ public String s1 {get;set;} public String s2 {get;set;} public String s3 {get;set;} public String s4 {get;set;} public String s5 {get;set;} public String s6 {get;set;} public String s7 {get;set;} private final Case c; public CaseListCtrl(ApexPages.StandardSetController controller) { this.c = (Case)controller.getRecord(); } public List <Case> getCases(){ return [SELECT Id, Labels2__c FROM Case]; } public List<Case> casesList { get { return [SELECT Id, Labels2__c FROM Case]; } private set; } Public ApexPages.Action getIt(){ List<List<String>> lstS = new List<List<String>>(); List<String> setS = new List<String>(); if(!casesList.isEmpty()){ for (integer i = 0; i < casesList.size(); i++){ Case cR = casesList[i]; if (cR != null && String.isNotBlank(casesList[i].Labels2__c) ) { lstS.add(cR.Labels2__c.split(';')); } } if (lstS.size() > 0){ for (integer i = 1; i < lstS.size(); i++){ //I dont get this logic //you overwrite strings, you dont know if lstS.get(i) contains values and how many... // s1 = lstS.get(i)[0]; // s2 = lstS.get(i)[1]; // s1 = lstS.get(i)[2]; // s2 = lstS.get(i)[3]; // s1 = lstS.get(i)[4]; // s2 = lstS.get(i)[5]; // s1 = lstS.get(i)[6]; // s2 = lstS.get(i)[7]; } } } return null; }

February 7, 2017
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Adelchi Pelizzo
@Shot

The one method you mention above was suggested to me.

I am trying this one, but it seems that, it does not stop when an if condition is 'false'. For testing I am feeding List<Cases> CasesList ; with only one record as :
public List<Case> casesList { get { return [SELECT Id, Labels2__c FROM Case Where id='5000P00000Y4XnpQAF']; } private set; }

This record has 3 values selected in the multipicklist. The loop should stop when there is no value coming from the labels2__c (multipicklist), instead it gives:
System.ListException: List index out of bounds: 3
Error is in expression '{!getIt}' in component <apex:page> in page testctrlcase: Class.CaseListCtrl.getIt: line 65, column 1
Class.CaseListCtrl.getIt: line 65, column 1

Which is the line when it checks for the 4th value.
Shouldn't just exist the loop if the condition is false?
Public ApexPages.Action getIt(){ List<String> lS = new List<String>(); if (!casesList.isEmpty()){ if(casesList.get(0).labels2__c.split(';')[0] != null){ ls.add(casesList.get(0).labels2__c.split(';')[0]); s1 = ls[0]; } if(casesList.get(0).labels2__c.split(';')[1]!=null){ ls.add(casesList.get(0).labels2__c.split(';')[1]); s2 = ls[1]; } if(casesList.get(0).labels2__c.split(';')[2]!=null){ ls.add(casesList.get(0).labels2__c.split(';')[2]); s3 = ls[2]; } if(casesList.get(0).labels2__c.split(';')[3]!=null){ ls.add(casesList.get(0).labels2__c.split(';')[3]); s4 = ls[3]; } if(casesList.get(0).labels2__c.split(';')[4]!=null){ ls.add(casesList.get(0).labels2__c.split(';')[4]); s5 = ls[4]; } if(casesList.get(0).labels2__c.split(';')[5]!=null){ ls.add(casesList.get(0).labels2__c.split(';')[5]); s6 = ls[5]; } if(casesList.get(0).labels2__c.split(';')[6]!=null){ ls.add(casesList.get(0).labels2__c.split(';')[6]); s7 = ls[6]; } } return null; }

February 7, 2017
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