尝试取消引用空对象Salesforce Visualforce Page

Question

I have a PHP site that calls a REST end point on Salesforce via a visualforce page. When trying to validate the JSON response I confirmed all required fields but am now getting this error:

{"success":false, "message":"System.NullPointerException: Attempt to de-reference a null object

This is coming from the following Apex Class:

public class WebDirectController {

public class ApiException extends Exception {}

public String response {get;set;}

private static final String PRIVATE_APPLICATION_KEY = '123';

public WebDirectController(){}

public Pagereference safeAction(){

    Savepoint sp = Database.setSavepoint();

    String businessUnit;

    try {

        Map<String, String> params = ApexPages.currentPage().getParameters();

        for (String key : params.keySet()){
            system.debug(key +' -> '+ params.get(key));

        }

        if (params.containsKey('Business_Unit__c') == false){
            throw new ApiException('Unauthorized!');
        }

        businessUnit = params.get('Business_Unit__c');

        if (params.containsKey('applicationKey') == false){
            throw new ApiException('Unauthorized!');
        }
        if (params.get('applicationKey') != PRIVATE_APPLICATION_KEY){
            throw new ApiException('Unauthorized!');
        }

        // throws ApiException
        validateRequiredFields(params);


        WebDirectUtility utility = new WebDirectUtility(businessUnit);

        utility.duplicateCheck(params);

        if (utility.duplicateAccountList.isEmpty() == false){

            // if last opp is needs RX attach attachments to opp and flag opportunity

            if (utility.duplicateAccountList.get(0).Opportunities.isEmpty() == false 
                && utility.duplicateAccountList.get(0).Opportunities.get(0).Status__c == 'Needs Rx' 
                && utility.hasAttachments(params) == true){

                // save attachment.

                utility.createAttachmentList(params);

                utility.addAttachmentParentId(utility.duplicateAccountList.get(0).Opportunities.get(0).Id);

                insert utility.attachmentList;

                // set status to  'Attention- Call Center'

                Opportunity opp = utility.duplicateAccountList.get(0).Opportunities.get(0);

                opp.Status__c = 'Attention- Call Center';

                update opp;

                //utility.sendEmail(params, utility.duplicateAccountList.get(0), opp);

                response = '{"success":true}';
                return null;

            }else{

                //utility.sendEmail(params, utility.duplicateAccountList.get(0));
                response = '{"success":true}';
                return null;
            }
        }

        utility.createAll(params);



        insert utility.patientAccount;

        utility.addAttachmentParentId(utility.patientAccount.Id);
        //system.debug('attachmentList -> '+ utility.attachmentList);
        insert utility.attachmentList;

        utility.addOpportunityAccountId(utility.patientAccount.Id);
        //system.debug('patientOpportunity -> '+ utility.patientOpportunity);
        insert utility.patientOpportunity;

        utility.addLineItemOpportunityId(utility.patientOpportunity.Id);
        //system.debug('lineItemList -> '+ utility.lineItemList);
        insert utility.lineItemList;


        //send success email to kelly
        Opportunity opp = [SELECT Opportunity_Url__c FROM Opportunity WHERE Id =:utility.patientOpportunity.Id];
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
  mail.setSubject(businessUnit + ' Direct Success Email');
  mail.setHtmlBody('<p>'+ businessUnit +' Direct created this opportunity: <a href="'+ opp.Opportunity_Url__c +'">'+ opp.Opportunity_Url__c +'</a></p>');
  mail.setToAddresses(new String[]{'[e-mail]', '[e-mail]'});
        Messaging.sendEmail(new Messaging.Email[] {mail});


        response = '{"success":true}';

    }catch(Exception e){

      ErrorEmail.sendEmail(e);

        system.debug(e);
        system.debug(e.getMessage());
        system.debug(e.getStackTraceString());

        response = '{"success":false, "message":"'+ e.getMessage() +'"}';

        Database.rollback(sp); 
    }
    return null;
}


public void validateRequiredFields(Map<String, String> params){

    Set<String> requiredParams = new Set<String>{'FirstName',
                                                 'LastName',
                                                 'PersonBirthdate',
                                                 'Phone',
                                                 'PersonEmail',
                                                 'BillingStreet',
                                                 'BillingCity',
                                                 'BillingState',
                                                 'BillingPostalCode'};

    for (String rp :requiredParams){
        if (params.get(rp) == '' || params.get(rp) == null){
            throw new ApiException(rp +' is required!');
        }
    }
}

}

Not sure what I am missing but I am going on 2 weeks of trying to figure this out.

Thank You

Answer 1

I wanted to close the loop on this. By adding the stack track to the debug msg I was able to locate an error in the setup that resolved the Apex class issue, The product line item entry in the Utility class was pointing to the wrong pricebook.

Adding the Stack Trace to the debug msg was the trick.

Thank you