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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Integration | 15% | - Named Credentials and authentication - External Services and Connect REST API - Platform Events and Change Data Capture - REST and SOAP web services (Apex callouts) |
| Topic 2: Logic and Process Automation | 22% | - Asynchronous Apex (Batch, Queueable, Future, Scheduled) - Invocable Actions and Platform Events - Dynamic Apex and SOQL/SOSL - Advanced Apex programming |
| Topic 3: User Interface | 18% | - Aura Components - Visualforce advanced controllers - Lightning Web Components (LWC) advanced features - Lightning Data Service |
| Topic 4: Data Modeling | 12% | - External objects and data sources - Large data volumes considerations - Advanced object relationships and data modeling |
| Topic 5: Testing, Debugging, and Deployment | 15% | - Test data strategies and mocking - Debugging and performance profiling - Apex unit testing best practices - Deployment tools (SFDX, Metadata API) |
| Topic 6: Architecture | 18% | - Apex Enterprise Patterns - Governor limits and bulkification - Design patterns and Apex trigger frameworks - Namespace and package management |
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28. Frage
Refer to the code snippet below:
A custom object called Credit_Memo__c exists in a Salesforce environment. As part of a new feature development that retrieves and manipulates this type of record, the developer needs to ensure race conditions are prevented when a set of records are modified within an Apex transaction. In the preceding Apex code, how can the developer alter the query statement to use SOQL features to prevent race conditions within a transaction? A)
B)
C)
D)
Antwort: C
Begründung:
To prevent race conditions during an Apex transaction, the SOQL query can be modified to include the "FOR UPDATE" keyword. This keyword locks the records that are returned by the query, preventing other transactions from modifying them until the current transaction is complete. This ensures that the retrieved records cannot be changed by another process before the current transaction is completed, thus preventing race conditions. The correct option to use in the code snippet provided is:
[SELECT Id, Name, Amount__c FROM Credit_Memo__c WHERE Customer_Id__c = :customerId LIMIT 50 FOR UPDATE] This will lock up to 50 records of Credit_Memo__c with the specified Customer_Id__c for the duration of the transaction.
FOR UPDATE
Preventing Record Update Conflicts
29. Frage
A developer creates an application event that has triggered an infinite loop.
What may have caused this problem?
Antwort: A
Begründung:
The infinite loop in the application event could be caused by multiple handlers registered in the project. If the event is fired and then handled in such a way that the handling leads to the event being fired again, this can create a loop. Care must be taken to ensure that the handling of the event does not re-trigger the same event unintentionally.
30. Frage
Given a list of Opportunity records named opportunityList, which code snippet is best for querying all Contacts of the Opportunity's Account?
A)
B)
C)
D)
Antwort: C
31. Frage
When the code is executed, the callout is unsuccessful and the following error appears within the Developer Console:
System.CalloutException: Unauthorized endpoint
Which recommended approach should the developer implement
to resolve the callout exception?
Antwort: D
Begründung:
The System.CalloutException with the message "Unauthorized endpoint" typically indicates that the endpoint to which the callout is being made has not been authorized in the Salesforce org's security settings. To resolve this, the developer must navigate to the Remote Site Settings in the Salesforce Setup and add the endpoint URL as a new remote site. This step is necessary to authorize the Salesforce org to send outbound callouts to that specific endpoint. Annotating with @Future(Callout=true) is necessary for making callouts from methods that perform DML operations, but it does not resolve endpoint authorization issues. Similarly, changing the access modifier or using SetHeader() for authentication would not address the unauthorized endpoint error.
Remote Site Settings
Apex Developer Guide: Making Callouts Using Apex
32. Frage
A Visualforce page needs to make a callout to get billing information and tax information from two different REST endpoints. The information needs to be displayed to the user at the same time and the return value of the billing information contains the input for the tax information callout. Each endpoint might take up to two minutes to process.
How should a developer implement the callouts?
Antwort: B
Begründung:
Using Continuation for both callouts is the optimal solution when you have long-running callouts in a Visualforce page, as it allows the page to wait for a long-running process without tying up server resources. The Continuation pattern is specifically designed for scenarios where the request-response cycle could exceed the timeout limits.
33. Frage
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