Common Types of Exceptions in Apex

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What Do You Mean by Exception?

An exception is an event that occurs during the execution of a program, disrupting the normal flow of the program's instructions. In Apex, you can utilize built-in exceptions or create your own custom exceptions. All exceptions share common methods and support built-in functionalities for returning error messages and exception types.

Common Types of Exceptions in Apex

Let's explore a few of these exceptions:

In Salesforce Apex, exceptions are errors that disrupt the normal flow of code execution. Apex provides a variety of built-in exception classes to handle different error scenarios. Here are some common exceptions:

  • DmlException: Occurs when there's an issue with a DML statement, such as inserting a record without required fields.

  • ListException: Thrown when attempting to access an index that is out of bounds in a list.

  • NullPointerException: Happens when trying to dereference a null object.

  • QueryException: Arises from problems with SOQL queries, like assigning a query that returns no records or more than one record to a singleton sObject variable.

  • SObjectException: Related to issues with sObject records, such as attempting to modify a field that can only be changed during insert.

  • LimitException: Indicates that a governor limit has been exceeded, such as too many SOQL queries in a single transaction. This exception can't be caught.

  • StringException: Deals with problems related to strings, like exceeding the heap size limit.

  • JSONException: Occurs during JSON serialization and deserialization operations.

  • MathException: Happens when there's an error in a mathematical operation, such as division by zero.

  • IllegalArgumentException: Thrown when an illegal argument is provided to a method call.

  • NoSuchElementException: Occurs when trying to access items outside the bounds of a list.

  • SecurityException: Related to issues with static methods in the Crypto utility class.

  • FlowException: Arises when there's a problem starting flow interviews from Apex.

For a comprehensive list of built-in exceptions and their descriptions, refer to the Apex Reference Guide.

Implementing proper exception handling in your Apex code is essential to manage errors gracefully and maintain robust applications.







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