尝试取消引用空对象 Salesforce Visual Force Page

Question

我有一个 PHP 站点，它通过 visualforce 页面调用 Salesforce 上的 REST 端点。在尝试验证 JSON 响应时，我确认了所有必填字段，但现在收到此错误：

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

这来自以下 Apex Class：

public class WebDirectController {

public class ApiException 扩展异常 {}

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[]{'pedrick@symplmed.com', 'childs@symplmed.com'});
        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!');
        }
    }
}

}

不确定我遗漏了什么，但我将花费 2 周时间尝试解决这个问题。

谢谢

Answer 1

以您在 PHP 应用程序中使用其凭据的用户身份登录 SF。打开开发者控制台（右上角，您的用户名旁边），执行来自 PHP 的调用。理想情况下，您会看到生成的调试日志，其中包含更详细的错误消息，包括行号和堆栈跟踪。

或者 - 转到设置 -> 调试日志并启用该集成用户的跟踪（这将为您提供可以查看和下载的文件；开发者控制台有它的怪癖，可能会很慢，但至少它会解析为您准备的日志，这样更容易阅读，您可以在其中设置检查点...)

很难说出了什么问题，堆栈跟踪会让你更幸运。我的疯狂猜测是 utility.duplicateAccountList 为空，然后如果您的代码执行 null.isEmpty() ，您显然会遇到错误 ;)

P.S。您是否考虑过将您的 Apex 部分公开为适当的 'REST service'，而不是 VF 页面？

Answer 2

我想结束这个循环。通过将堆栈轨道添加到调试消息中，我能够在解决 Apex class 问题的设置中找到错误，实用程序 class 中的产品行项目条目指向错误的价格手册。

将 Stack Trace 添加到调试消息中就是诀窍。

谢谢

尝试取消引用空对象 Salesforce Visual Force Page

Attempt to de-reference a null object Salesforce Visual Force Page

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