How to avoid Null Pointer Exception in Salesforce|
How to avoid Null Pointer Exception in Salesforce
What is Null pointer exception in salesforce
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Apex development
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A Null Pointer Exception in Apex occurs when you try to dereference a variable or call a method on an object that hasn't been instantiated (i.e., it's null). This can lead to runtime errors that can disrupt the execution of your code. Below is an example to illustrate how a Null Pointer Exception might occur in Apex and how to handle it:
Common Scenarios Leading to Null Pointer Exceptions
Uninitialized Variables: Variables that are declared but not initialized.
Empty Query Results: SOQL queries that return no results, leaving the variable null.
Improper JSON Deserialization: Deserializing JSON into an object with unexpected or missing fields.
Integration Responses: External service callouts that return null or unexpected responses.
Preventive Measures
Initialization: Always initialize your variables.
Null Checks: Implement null checks before dereferencing objects.
Exception Handling: Use try-catch blocks to handle exceptions gracefully.
Unit Testing: Write comprehensive tests to cover null scenarios.
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00:00 What is Null Pointer Exception
03:45 Example of Null Pointer Exception
05:15 How to Avoid Null Pointer Exception