[Sep 14, 2026] Free Salesforce Developer Plat-Dev-301 Official Cert Guide PDF Download [Q84-Q100]

admin -

September 14, 2026

Rate this post

[Sep 14, 2026] Free Salesforce Developer Plat-Dev-301 Official Cert Guide PDF Download

Salesforce Plat-Dev-301 Official Cert Guide PDF

Salesforce Plat-Dev-301 Exam Syllabus Topics:

Section	Weight	Objectives
Logic, Process Automation, and Integration	27%	– Advanced Apex programming and transaction management – Asynchronous Apex: future, queueable, batch, scheduled – Complex business logic and automation design – REST/SOAP API, Platform Events, and external integrations
Testing, Debugging, and Deployment	20%	– Deployment strategies, CI/CD, and change management – Advanced testing strategies and test frameworks – Debugging and error handling across layers
Advanced Developer Fundamentals	15%	– Apply security best practices in development – Design and maintain scalable, reusable code – Work with localization, multi-currency, and global features
Performance and Data Management	18%	– Data modeling and complex data operations – Optimize queries and handle large data volumes – Governor limits optimization and best practices
User Interface Development	20%	– Build complex Lightning Web Components and Aura Components – Implement advanced Visualforce functionality – Optimize UI performance and usability

NO.84 Given the following containment hierarchy:
What is the correct way to communicate the new value of a property named ”passthrough” to my-parent-component if the property is defined within my-child-component?
A)
B)

C)

D)

Option A

Option B

Option C

Option D

To communicate a property change up a containment hierarchy in Lightning Web Components (LWC), the child component should dispatch a custom event with the detail of the change. The parent component listens for this event and handles it accordingly.
Option A is the correct method because it creates a new custom event with the detail property containing the new value of passthrough. This event is then dispatched, and the parent component can listen for this event to handle the updated value.
Options B, C, and D are incorrect because they either don’t pass any data with the event or they don’t use the detail object which is the standard way to pass data with custom events in LWC.
Lightning Web Components Developer Guide – Communicating with Events

NO.85 Which statement is considered a best practice for writing bulk safe Apex triggers?

Add records to collections and perform DML operations against these collections.

Add LIMIT 50000 to every SOQL statement.

Perform all DML operations from within a future method.

Use the Database methods with allorNone set to £21s= instead of DML statements.

Bulk-safe triggers use collections to aggregate DML operations. This practice minimizes the number of DML statements, which is essential for bulk processing.

NO.86 A developer is asked to find a way to store sacret data with an ability to specify which profiles and users can access which secrets.
What should be used to store this data?

system.Cookie class

Custom settings

Static resources

Custom metadata

Custom metadata types are the optimal way to store secret data that needs to be accessed by certain profiles and users. Access to custom metadata records can be controlled by the Salesforce sharing model.

NO.87 A company has a custom component that allows users to search for records of a certain object type by invoking an Apex Controller that returns a list of results based on the user’s input. When the search is completed, a searchComplete event is fired, with the results put in a results attribute of the event. The component is designed to be used within other components and may appear on a single page more than once.
What is the optimal code that should be added to fire the event when the search has completed?
A)

B)

C)

D)

Option A

Option B

Option C

Option D

The correct code to fire the event when the search has completed in a Lightning component is option B. $A.get(“e.c.searchComplete”) is the syntax used to get the event, setParams is used to set the parameters, and fire is used to dispatch the event.

NO.88 A Salesforce developer is hired by a multi-national company to build a custom Lightning application that shows employees their employment benefits and earned commissions over time. The application must acknowledge and respect the user’s locale context for dates, times, numbers, currency, and currency symbols.
When using Aura components, which approach should the developer implement to ensure the Lightning application complies with the user’s locale?

Use the $User global variable to retrieve the user preferences.

Use the $Label global value provider.

Use the $Lacale value provider to retrieve the user preferences.

Create a Hierarchical custom setting to store user preferences.

The $Locale value provider should be used to ensure the Lightning application respects the user’s locale for dates, times, numbers, currency, and currency symbols. This global value provider gives components access to locale formats and labels, which are automatically rendered according to the user’s locale settings.

NO.89 A developer is trying to access org data from within a test class.
Which sObject type requires the test class to have the (seeAllData=true) annotation?

User

RecordType

Report

Profile

https://salesforce.stackexchange.com/questions/149110/when-is-it-appropriate-to-use-seealldata-true

NO.90 Salesforce users consistently receive a “Maximum trigger depth exceeded” error when saving an Account. How can a developer fix this error?

Split the trigger logic into two separate triggers.

Convert the trigger to use the 3suzure annotation, and chain any subsequent trigger invocations to the Account object.

Modify the trigger to use the L=MultiThread=true annotation,

Use a helper class to set a Boolean to TRUE the first time a trigger 1s fired, and then modify the trigger ta only fire when the Boolean is FALSE.

A common solution to the “Maximum trigger depth exceeded” error is to use a static variable in a helper class. The variable acts as a switch to ensure the trigger logic only executes once per transaction, preventing recursive trigger calls.

NO.91 An Aura component has a section that displays some information about an Account and it works well on the desktop, but users have to scroll horizontally to see the description field output on their mobile devices and tablets.

How should a developer change the component to be responsive for mobile and tablet devices? A)

B)

C)

D)

Option A

Option B

Option C

Option D

To make the Aura component responsive, the developer should set multipleRows=”true” to allow the layout items to wrap onto multiple rows on smaller devices. Additionally, setting the size attribute for different device sizes ensures that the layout adapts to the screen width.

NO.92 Universal Containers allows customers to log into a Salesforce Community and update their orders via a custom Visualforce page. Universal Containers’ sales representatives can edit the orders on the same Visualforce page.
What should a developer use in an Apex test class to test that record sharing is enforced on the Visualforce page?

use System. profiles=() to test as a sales rep and a community user.

use System. profiles() to test as an administrator and a community user.

use System. profiles1h=() to test as a sales rep and a community user.

use System. runsAs () to test as an administrator and a community user.

The System.runAs() method is used in test classes to enforce record sharing. This method allows you to write test methods that change user contexts to ensure that the proper record sharing is enforced. Reference:
Understanding the runAs Method

NO.93 Universal Containers is using a custom Salesforce application to manage customer support cases. The support team needs to collaborate with external partners to resolve certain cases. However, they want to control the visibility and access to the cases shared with the external partners. Which Salesforce feature can help achieve this requirement?

Role hierarchy

Criteria-based sharing rules

Apex managed sharing

Sharing sets

Apex managed sharing is the correct feature to control the visibility and access to cases shared with external partners. It allows developers to programmatically create sharing records that grant access to users based on specific criteria, providing granular control over record sharing.

NO.94 A developer is debugging an Apex-based order creation process that has a requirement to have three savepoints, SP1, SP2, and 5P3 {created in order), before the final execution of the process.
During the final execution process, the developer has a routine to roll back to SP1 for a given condition. Once the condition is fixed, the code then calls 2 roll back to SP3 to continue with final execution. However, when the roll back to SP3 is called, a Funtime error occurs.
Why does the developer receive a runtime error?

SP3 became invalid when SP1 was rolled back.

The developer has too many DML statements between the savepoints.

The developer used too many savepoints in one trigger session.

The developer should have called SF2 before calling SP3.

Savepoints in Apex are markers within a transaction and rolling back to an earlier savepoint (SP1) invalidates any savepoints created after it. Thus, SP3 is invalidated when the code rolls back to SP1, causing a runtime error when a rollback to SP3 is attempted.

NO.95 Universal Containers is implementing a new approval process for expense reimbursements. The process requires complex logic to determine the appropriate approver based on factors such as expense amount, employee role, and project type. The solution should allow for flexibility and future changes in the approval rules.
Which approach would be the most suitable for implementing this logic?

Create a custom Apex class with a method to determine the appropriate approver based on the given criteria.

Develop a custom Lightning component to handle the approval logic and integrate it into the expense reimbursement record page.

Implement a custom formula field to calculate and determine the appropriate approver based on the given criteria.

Use the Salesforce Approval Process feature and define multiple approval steps with entry criteria and approval assignments.

Creating a custom Apex class with methods to determine the appropriate approver is the most suitable approach when dealing with complex logic and the need for flexibility. This approach allows for centralized logic that can be easily maintained and updated as business requirements change.

NO.96 Refer to the following code snippets:
A developer is experiencing issues with a Lightning web component. The component must surface information about Opportunities owned by the currently logged-in user.

When the component is rendered, the following message is displayed: “Error retrieving data”. Which modification should be implemented to the Apex class to overcome the issue?

Use the Cacheable=true attribute in the Apex method,

Ensure the OWD for the Opportunity object is Public.

Edit the code to use the w. cut sharing keyword in the Apex class.

Use the Continuation=true attribute in the Apex method.

The @AuraEnabled(cacheable=true) attribute allows caching of method results on the client side, reducing server trips for already fetched data, which is useful for read-only data.

NO.97 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)

Option A

Option B

Option C

Option D

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

NO.98 Universal Containers wants to use a Customer Community with Customer Community Plus licenses to allow their customers access to track how many containers they have rented and when they are due back. Universal Containers uses a Private sharing model for External users, Many of their customers are multi-national corporations with complex Account hierarchies. Each account on the hierarchy represents a department within the same business, One of the requirements is to allow certain community users within the same Account hierarchy to see several departments’ containers, based on a custom junction object that relates the Contact to the various Account records that represent the departments.
Which solution solves these requirements?

A Visualforce page that uses a custom controller that specifies without sharing [0 expose the records

An Apex trigger that creates Apex managed sharing records based on the junction object’s relationships

A Lightning web component on the Community Home Page that uses Lightning Data Services.

A custom list view on the junction object with filters that will show the proper records based on owner

For community users within the same Account hierarchy to see records based on a custom junction object, Apex managed sharing can be used. An Apex trigger can create sharing records based on the junction object relationships, allowing users to see records from different departments as required.

NO.99 Universal Containers stores user preferences in a Hierarchy Custom Setting, User_Prefs_c, with a Checkbox field, Show_Help_c. Company-level defaults are stored at the organizational level, but may be overridden at the user level. If a user has not overridden preferences, then the defaults should be used.
How should the Show_Help_c preference be retrieved for the current user?

Boolean show = User_Prefs__c.getValues(UserInfo.getUserId()).Show_Help__c;

Boolean show = User_Prefs__c.getInstance().Show_Help__c;

Boolean show = User_Prefs__c.Show_Help__c;

Boolean show = User_Prefs__c.getValues().Show_Help__c;

To retrieve the Show_Help__c preference for the current user from a hierarchy custom setting, the getInstance() method should be used. This method retrieves the custom setting data for the user or the organization default if no user-specific setting is found.

NO.100 A developer built an Aura component for guests to self-register upon arrival at a front desk kiosk. Now the developer needs to create a component for the utility tray to alert users whenever a guest arrives at the front desk.
What should be used?

DML Operation

Changelog

Application Event

Component Event

Application Events in Aura components are used for communication between components that are not in the same containment hierarchy. An application event to alert users about the arrival of a guest at the front desk is appropriate because it allows any component within the app to listen and respond to the event, regardless of where it is located in the component hierarchy.

Loading …