I have the following class with constructor chaining , but the validations are returning Method not found or incorrect signature


global class CalloutMock implements HttpCalloutMock {
    private Map<String,HttpResponse> httpResponseMap = new Map<String,HttpResponse>();

   global CalloutMock(Map<String,HttpResponse> responseMap){
        if (responseMap != null) {
            httpResponseMap = responseMap;

   global CalloutMock(){

    global HttpResponse respond(HttpRequest req) {
        System.debug('req end point hitting is ' + req.getEndpoint());
        return  httpResponseMap.get(req.getEndpoint());


why is that ? and how do i resolve it?

  • You should use this(null); instead of CalloutMock(null); Nov 8, 2021 at 9:11

1 Answer 1


To call a different constructor, you should call this(null);, instead CalloutMock(null);. The latter would just call an instance method called CalloutMock, which is not exactly what you're doing.

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