Hi Everyone,

if anyone find error in my apex class and please guide me.Actually i was new to write a programs.thanks you very much for helping me.

Apex class:

@RestResource(urlMapping='/DeleteInfo/*')
global class DeleteInfo {
@HttpPost
    global static String doPost() {
        String responseJSON;
        if (RestContext.request.requestBody != null) {
            String requestStatus;
            String reqBody = RestContext.request.requestBody.toString();
            String ParentId = null;
            Request Request = new Request();
            String environmentCode = Utility.getEnvironmentCode(UserInfo.getUserName());
            
            try {
                Req req = (Req)JSON.deserialize(reqBody, DeleteInfo.Req.class);
                Request = req.Request;
                
                if (Request.Parent != null) {
                    if (Request.Parent.StarID != null && Request.Parent.StarID != '') {
                        String ParentStarID = Request.Parent.StarID + '__' + environmentCode;
                        List<Hub_Parent__c> ptList = [select Id from Hub_Parent__c where StarID__c = :ParentStarID Limit 1];
                        
                        if (ptList.size() > 0) {
                            Hub_Parent__c objParent = ptList[0];
                            ParentId = objParent.Id;
                            
                            ParentDataDelete.DataDelete(objParent.Id);
                            
                            //List<ParentPrescription__c> lstParentPrescription = [select Id, Status__c from ParentPrescription__c Where Parents__c = :ParentId order by RxExpirationDate__c desc NULLS LAST, LastModifiedDate Desc limit 1];
                            
                            /*if (objParent.Prescriptions__r.size() > 0) {
                                ParentPrescription__c objParentPrescription = objParent.Prescriptions__r[0];
                                if (Request.Prescription.Status != null && (Request.Prescription.Status == 1 || Request.Prescription.Status == 2)) {
                                    String prescriptionStatus = Request.Prescription.Status == 1 ? 'Active' : 'Inactive';
                                    if (prescriptionStatus != objParentPrescription.Status__c) {
                                        objParentPrescription.Status__c = prescriptionStatus;
                                        update objParentPrescription;
                                    }
                                    responseJSON = InboundTransactionResponse.GetSucessResponse(Request.Header.TransactionType, Request.Header.TimeStamp, Request.Header.FileID, Request.Prescription.StarID);
                                    requestStatus = 'Success';
                                }
                                else {
                                    responseJSON = InboundTransactionResponse.GetErrorResponse(Request.Header.TransactionType, Request.Header.TimeStamp, Request.Header.FileID, Request.Prescription.StarID, 'Status', '0056', 'Invalid Prescription Status');
                                    requestStatus = 'Failure';
                                }
                            }
                            else {
                                responseJSON = InboundTransactionResponse.GetErrorResponse(Request.Header.TransactionType, Request.Header.TimeStamp, Request.Header.FileID, Request.Prescription.StarID, 'Prescription', '0056', 'Prescription doesn\'t exists in system for the Parent');
                                requestStatus = 'Failure';
                            }*/
                            responseJSON = InboundTransactionResponse.GetSucessResponse(Request.Header.TransactionType, Request.Header.TimeStamp, Request.Header.FileID, Request.Parent.StarID);
                            requestStatus = 'Success';
                        }
                        else {
                            responseJSON = InboundTransactionResponse.GetErrorResponse(Request.Header.TransactionType, Request.Header.TimeStamp, Request.Header.FileID, Request.Parent.StarID, 'StarID', '0056', 'StarID doesn\'t exists in system');
                            requestStatus = 'Failure';
                        }
                    }
                    else {
                        responseJSON = InboundTransactionResponse.GetErrorResponse(Request.Header.TransactionType, Request.Header.TimeStamp, Request.Header.FileID, null, 'StarID', '001', 'StarID is a required field.');
                        requestStatus = 'Failure';
                    }
                }
                else {
                    responseJSON = InboundTransactionResponse.GetErrorResponse(Request.Header.TransactionType, Request.Header.TimeStamp, Request.Header.FileID, null, 'Parent', '001', 'Invalid request format.');
                    requestStatus = 'Failure';
                }
                BlueStarTransactionDetails.CreateInboundTransactionRequest(Request.Header.TransactionType, Request.Header.FileID, requestStatus, reqBody, responseJSON, null, null, null, environmentCode);
            }
            catch (Exception ex) {
                System.debug('Delete Exception: ' + ex.getMessage());
                String fileId;
                if (Request.Header != null && Request.Header.FileID != null) {
                    fileId = Request.Header.FileID;
                }
                else {
                    fileId = 'Unknown';
                }
                BlueStarTransactionDetails.CreateInboundTransactionRequest(Request.Header.TransactionType, fileId, 'Exception', reqBody, ex.getMessage(), null, null, null, environmentCode);
                if(Request != null && Request.Header != null){
                    responseJSON = InboundTransactionResponse.GetErrorResponse(Request.Header.TransactionType, Request.Header.TimeStamp, Request.Header.FileID, null, 'Error', '0056', ex.getMessage());
                }else{
                    responseJSON = ex.getMessage();
                }
            }
        }
        return responseJSON;
    }
    
    public class Parent {
        public String StarID {get;set;}
    }
    
    public class Header {
        public String TransactionType {get;set;}
        public String TimeStamp {get;set;}
        public String FileID {get;set;}
    }
    
    public class Request {
        public Parent Parent {get;set;}
        public Header Header {get;set;}
    }
    
    public class Req {
        public Request Request {get;set;}
    }
}


Test Class for above Apex class:

@isTest
public class DeleteInfo_Test {
    static testMethod void TestDeleteInfo(){
        
        Test.startTest();
        HubTestController.createCustomSettings();
        //User usr = [Select Id from User where UserName = 'bluestar@welldocinc.com.sfdev4' Limit 1];
        List<User> usr = [Select Id,UserName from User where Name = 'bluestar bluestar' Limit 1];
        system.runAs(usr[0]){
            HubTestController.createEnviornmentSettingsWithUserName(usr[0].UserName);
            Hub_parent__c parent = new Hub_parent__c();
            parent.GivenName__c = 'Mangesh';
            parent.SampleCode__c = 'SCA1556329';
            parent.FamilyName__c = 'K';
            parent.Status__c = 'SRF Incomplete';
            parent.StarID__c ='StarID__bst';
            parent.FamilyName__c = 'K';
            parent.DOB__c = System.today();
            parent.Gender__c = 'M';
            
            insert parent;  
            RestRequest req = new RestRequest();
            RestResponse res = new RestResponse();
            
            String str ='{"Request":{"Header":{"TransactionType":"DeleteInfo","TimeStamp":"03-15-2016 12:09:15:252","FileID":"DeleteInfo.03152016120915252"},"parent":{"StarID":"StarID","Status":"Pending"}}}';
            req.requestURI = '/DeleteInfo/*';  
            req.httpMethod = 'Post';
            RestContext.request = req;
            RestContext.request.requestBody = Blob.valueOf(str);
            RestContext.response = res;
            String results = DeleteInfo.doPost();
            
            str = '{"Request":{"Header":{"TransactionType":"DeleteInfo","TimeStamp":"03-15-2016 12:09:15:252","FileID":"DeleteInfo.03152016120915252"},"parent":{"StarID":"StarID","AccountCode":"WD","SampleCode":"SampleCode"}}}';
            req.requestURI = '/DeleteInfo/*';  
            req.httpMethod = 'Post';
            RestContext.request = req;
            RestContext.request.requestBody = Blob.valueOf(str);
            RestContext.response = res;
            DeleteInfo.doPost();
            
            str = '{"Request":{"Header":{"TransactionType":"DeleteInfo","TimeStamp":"03-15-2016 12:09:15:252","FileID":"DeleteInfo.03152016120915252"},"parent":{"StarID":"StarID","AccountCode":"WD","SampleCode":"SampleCode"}}}';
            req.requestURI = '/DeleteInfo/*';  
            req.httpMethod = 'Post';
            RestContext.request = req;
            RestContext.request.requestBody = Blob.valueOf(str);
            RestContext.response = res;
            DeleteInfo.doPost();
            
            Str = '{"Request":{"Header":{"TransactionType":"DeleteInfo","TimeStamp":"03-15-2016 12:09:15:252","FileID"!=""},"parent":{"StarID"!="","AccountCode"!="","SampleCode"!=""}}}';
            req.requestURI = '/DeleteInfo/*';  
            req.httpMethod = 'Post';
            RestContext.request = req;
            req.requestBody = Blob.valueOf(str);
            RestContext.response = res;
            DeleteInfo.doPost();

            Test.stopTest();
        }
    }
}


Here i was facing issue was code was almost covered but while run the test class i was showing error.

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


if anyone please help me.


Thanks INadvance,
RajuBalaji