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Salesforce Plat-Dev-301 Exam Syllabus Topics:

Section	Weight	Objectives
Integration	15%	- External Services and Connect REST API - Platform Events and Change Data Capture - Named Credentials and authentication - REST and SOAP web services (Apex callouts)
Testing, Debugging, and Deployment	15%	- Apex unit testing best practices - Debugging and performance profiling - Test data strategies and mocking - Deployment tools (SFDX, Metadata API)
Logic and Process Automation	22%	- Invocable Actions and Platform Events - Asynchronous Apex (Batch, Queueable, Future, Scheduled) - Dynamic Apex and SOQL/SOSL - Advanced Apex programming
Architecture	18%	- Apex Enterprise Patterns - Governor limits and bulkification - Namespace and package management - Design patterns and Apex trigger frameworks
Data Modeling	12%	- External objects and data sources - Advanced object relationships and data modeling - Large data volumes considerations
User Interface	18%	- Lightning Web Components (LWC) advanced features - Lightning Data Service - Visualforce advanced controllers - Aura Components

>> Plat-Dev-301関連資格知識 <<

Plat-Dev-301テスト対策書、Plat-Dev-301日本語認定対策

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Salesforce Certified Platform Developer II - Multiple Choice 認定 Plat-Dev-301 試験問題 (Q87-Q92):

質問 # 87
Universal Containers analyzes a Lightning web component and its Apex controller class that retrieves a list of contacts associated with an account. The code snippets are as follows:

Based on the code snippets, what change should be made to display the contacts' mailing addresses in the Lightning web component?

A. Modify the SOQL query in the getAccountContacts method to include the MailingAddress field and update the columns attribute in javascript file to add Mailing address fields.
B. Modify the SOQL guery in the getAccountContacts method to include the MailingAddress field.
C. Extend the lightning-datatable component in the Lightning web component to include a column for the MailingAddress field.
D. Add a new method in the Apex controller class to retneve the mailing addresses separately and modify the Lightning web component to invoke this method.

正解：A

解説：
To display the contacts' mailing addresses in the Lightning web component, both the SOQL query in the getAccountContacts method and the columns attribute in the JavaScript file of the component need to be updated. The query must include the MailingAddress field, and the JavaScript file must be modified to add this field to the columns shown in the lightning-datatable.

質問 # 88
A developer has a test class that creates test data before making a mock callout but now receives a 'You have uncommitted work pending. Please commit or rollback before calling out' error.
Which step should be taken to resolve the error?

A. Ensure the records are Inserted before the Tezt.startTest() statement and the mock callout occurs within a method annotated with @testSetup.
B. Ensure both the Insertion and mock callout occur after the I==L. stoptest_().
C. Ensure both the insertion and mock callout occur after the Test.startTest().
D. Ensure the records are inserted before the Test.startTess() statement and the mock callout occurs after the Test. Startest().

正解：D

解説：
When working with Apex tests that involve callouts, it's important to avoid the 'uncommitted work pending' error. This error typically occurs because DML operations (like inserts) are pending when a callout is attempted. Salesforce requires that all callouts are made before any DML operations in a transaction. To avoid this, the pattern is to insert the records before calling Test.startTest(), and then make the callout after this call. Test.startTest() marks the point where your actual test begins, and it resets the governor limits. By making the callout after this point, it ensures that the DML operations are committed and you are within a new execution context regarding governor limits.
Testing HTTP Callouts by Implementing the HttpCalloutMock Interface
Understanding Execution Contexts

質問 # 89
Consider the following code snippet:

Which two steps should the developer take to add flexibility to change the endpoint and credentials without needing to modify code? Choose 2 answers

A. Create a Named Credential, endPcint_wc, ta store the endpoint and credentials.
B. Use req. setindpoint ('callout:endFoint_NC'); within the callout request.
C. Use red. setEndpoint (Label.endPointURL) ;.
D. Store the URL of the endpoint in a custom Label named endpointuRL.

正解：B、D

質問 # 90
Universal Containers ne=ds to integrate with several external systems. The process Is Initiated when a record Is created in Salesforce, The remote systems do not require Salesforce to wait for a response before continuing.
What is the recommended best solution to accomplish this?

A. PushTopic event
B. Platform event
C. Qutbound message
D. Trigger with HTTP callout

正解：B

解説：
Platform events provide a robust and scalable way to communicate changes and events from Salesforce to external systems, especially when there is no requirement for Salesforce to wait for a response. They are designed to support event-driven architectures and can handle high volumes of events that can be published and consumed by external systems. Outbound messages, on the other hand, are limited by the need for an acknowledgment response from the target system, which can introduce latency.

質問 # 91
A page throws an 'Attempt to dereference a null object' error for a Contact.
What change in the controller will fix the error?

A. Use a condition in the getter to return a new Contact if it is null.G Change the setter's signature to return a Contact.
B. Change the getter's signature to be static Contact.
C. Declare a static final Contact at the top of the controller.

正解：A

解説：
The error 'Attempt to dereference a null object' often occurs when trying to access a member of a null object. By checking if the object is null in the getter method and returning a new instance if it is, the error can be prevented.
Apex Developer Guide

質問 # 92
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