How to prepare for your Salesforce Certified Platform Developer II (Plat-Dev-301) exam? You must understand the basic Salesforce development; demonstrate advanced skills in Apex programming, Lightning Web Components, application integration, testing, and deployment; and use DumpsBase Plat-Dev-301 practice tests to make your preparation more effective. The latest Plat-Dev-301 practice tests contain 175 questions and answers, which are designed to help you review important exam concepts, evaluate your knowledge, and become more confident with advanced Salesforce development scenarios. With these structured exam questions, verified answers, and detailed explanations, you can identify knowledge gaps and focus your study efforts on the areas that need improvement.<\/p>\n\n\n\n
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An Apex service creates an A service team flags A developer uploaded a third-party JavaScript file as a Salesforce static resource named A utility receives either a A Visualforce page binds an input field to Invoice__c<\/code> record, updates its related Account, and then performs another DML operation. The service catches a DmlException<\/code> so it can return a useful error to the caller. The business requirement is that none of the earlier changes remain if any operation fails. What should the developer add?
A. Log the exception in the catch block and return an error message.
B. Set a savepoint before the first DML operation and roll back to it in the catch block.
C. Set allOrNone<\/code> to false<\/code> on the first insert.
D. Call Test.startTest()<\/code> before the DML operations.
Answer:<\/strong> B
Explanation:<\/strong> Because the exception is caught, the developer should explicitly roll back to a savepoint to discard the earlier DML changes. Logging and returning an error do not undo them. allOrNone=false<\/code> permits partial success, and Test.startTest()<\/code> is a test method utility.<\/p>\n\n\n\nQuestion 2<\/h3>\n\n\n\n
Service_Request__c<\/code> records when their estimated cost exceeds a threshold. The threshold can change, and both an Apex trigger and a Lightning web component must apply the same rule. Which two design choices avoid duplicating the rule? Select two.
A. Store the threshold in a custom metadata type that Apex can read.
B. Put one copy of the threshold check in the trigger and another in the component’s JavaScript.
C. Put the evaluation in a reusable Apex service called by the trigger and by an Apex method exposed to the component.
D. Hard-code the threshold in the component and have the trigger read it from the browser.
Answer:<\/strong> A, C
Explanation:<\/strong> Custom metadata holds the configurable threshold, and a shared Apex service gives both entry points one implementation of the rule. Separate checks in the trigger and JavaScript can drift; a trigger cannot obtain its rule from a user’s browser.<\/p>\n\n\n\nQuestion 3<\/h3>\n\n\n\n
chartsBundle<\/code>. An LWC needs to load that file before using its functions. Which three actions belong in the component’s JavaScript? Select three.
A. Import chartsBundle<\/code> from @salesforce\/resourceUrl\/chartsBundle<\/code>.
B. Add a raw <script><\/code> tag to the component template.
C. Import loadScript<\/code> from lightning\/platformResourceLoader<\/code>.
D. Import the file from an @salesforce\/apex<\/code> module.
E. Call loadScript(this, chartsBundle)<\/code> and use the returned promise to know when loading is complete.
Answer:<\/strong> A, C, E
Explanation:<\/strong> The resource URL identifies the uploaded file, while loadScript<\/code> loads it and returns a promise. A template script tag and an Apex module import are not the documented loading path for a JavaScript static resource.<\/p>\n\n\n\nQuestion 4<\/h3>\n\n\n\n
Project__c<\/code> or an Invoice__c<\/code> record as an SObject<\/code>. Both objects have a populated text field named External_Key__c<\/code>. The utility must read that field without knowing the record’s concrete object type at compile time. Which expression should it use?
A. (String) record.get('External_Key__c')<\/code>
B. (String) record.getSObject('External_Key__c')<\/code>
C. (String) Schema.getGlobalDescribe().get('External_Key__c')<\/code>
D. (String) record.External_Key__c<\/code>
Answer:<\/strong> A
Explanation:<\/strong> SObject.get(String)<\/code> reads a field value by API name and returns an Object<\/code> that can be cast to the expected type. getSObject<\/code> retrieves a related record, getGlobalDescribe<\/code> maps object names to type tokens, and direct field syntax does not provide dynamic access through a generic SObject<\/code> variable.<\/p>\n\n\n\nQuestion 5<\/h3>\n\n\n\n
{!draftContact.LastName}<\/code>. Its custom controller has a getDraftContact()<\/code> method, but the backing Contact<\/code> variable can be null when the page renders. How should the developer prevent the null dereference while still returning a record for the form?
A. Have the getter create a new Contact<\/code> only when the backing variable is null, then return that variable.
B. Make the getter static so Visualforce can call it before the controller is constructed.
C. Catch the null pointer exception in the page markup.
D. Change the getter to return a PageReference<\/code> instead of a Contact<\/code>.
Answer:<\/strong> A
Explanation:<\/strong> A Visualforce getter supplies the value referenced by page markup. Initializing a missing Contact<\/code> before returning it gives the binding a record to use; changing the getter’s signature or relying on markup to catch a null dereference does not address the cause.<\/p>\n\n\n\n