I tried to write a Testclass for an Extension that is supposed to handle a replacement for a creation-page.


public class VisualforcePageExtTest{
    static testMethod void validateVfPInit(){

        PageReference tpageRef = Page.VisualforcePageName;

        //Testdata creation
        Account testAcc = new Account(Name = 'TestAccount', ao_Invoice_Type__c = 'Test', ax_lob__c = 'Test');
        insert testAcc;
        CustomObject testObj = new CustomObject (Name = 'TestName', 
                                                   account__c = testAcc.ID);
        insert testObj;


        ApexPages.StandardController sc = new ApexPages.StandardController(testObj);            
        VisualforcePageExt scExt = new VisualforcePageExt(sc);

        // POSITIV TESTS

I do however get the error

"Constructor not defined: [VisualforcePageExt].(ApexPages.StandardController)"

on the following line:

VisualforcePageExt scExt = new VisualforcePageExt(sc);

I also tried to use StandardSetController instead but got the error

"Constructor not defined: [ApexPages.StandardSetController].(CustomObject)"

The Extension:

public class VisualforcePageExt{

    private final CustomObject header = new CustomObject();
    public String accId = System.currentPageReference().getParameters().get('accid');

    public VisualforcePageExt(ApexPages.StandardSetController stdController) {
        if(!Test.isRunningTest()) stdController.addFields(new List<String>{'Account__c','Drucken__c','Kundennummer__c','SV_ort_f_r_FZBW__c','Zeilen_zentrieren__c','Erfasste_Zeilen__c','Land_Code__c','TP_Kopf_1__c','TP_Kopf_2__c','TP_Kopf_3__c','TP_Kopf_4__c','TP_Kopf_5__c','TP_Kopf_6__c','Schrift_1__c','Schrift_2__c','Schrift_3__c','Schrift_4__c','Schrift_5__c','Schrift_6__c','Erstellungsdatum_AS400__c'});
    public CustomObject getHeader(){
        if(System.currentPageReference().getParameters().get('accid') != null){
            Account masterAcc = [SELECT BillingStreet, BillingCity, Phone FROM Account Where Id = :accId LIMIT 1];
            System.debug('Street:' + masterAcc.BillingStreet +', '+ masterAcc.BillingCity);
            header.Account__c = accId;
            header.TP_Kopf_3__c = masterAcc.BillingStreet + ', ' + masterAcc.BillingCity;
            header.TP_Kopf_4__c = masterAcc.Phone;
            header.Zeilen_zentrieren__c = true;
        return header;
    public PageReference save(){
        insert header;
        PageReference pg = new PageReference('/'+header.Id);
        return pg;

    public PageReference redirectExistingHeader() {
        TP_Header__c[] headCount = [SELECT Name FROM TP_Header__c WHERE Account__c = :accId LIMIT 1];     
        System.Debug('Headcount:' + headCount.size());
            PageReference pg = new PageReference('/'+headCount[0].id);
            return pg;
        } else {
            return null;

EDIT: Added Extension

  • 4
    Can we see your actual extension constructors?
    – Adrian Larson
    Commented May 10, 2017 at 13:45

1 Answer 1


If you have not defined any constructors explicitly, then the empty constructor is implicitly defined, and no other constructors are allowed. That would also really make your Apex a Controller more than an Extension. Worth a read: Difference between controller and extensions

Basically, these two classes are the same as far as constructors go:

public class MyController { }

// above is same as below

public class MyController
    public MyController() { /*empty constructor*/ }

If you do indeed want to write an extension, you need to make sure you explicitly define the appropriate constructor. If you are trying to create a Detail Button/link, use StandardController. If you are trying to create a List Button, use StandardSetController:

public class MyExtension
    public MyExtension(ApexPages.StandardController controller)
  • 1
    Solved the problem. The Standard Construter is now defined as follows: ApexPages.StandardSetController sc = new ApexPages.StandardSetController(new List<TP_Header__c> {testHeader}); The StandardSetController was expecting a List.
    – Tim Werner
    Commented May 10, 2017 at 14:56

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