System Defined Exceptions Types | Salesforce Crm

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Salesforce CRM system does not have a specific concept called "Defined Exceptions and Types" as you might find in programming languages or frameworks. However, Salesforce does handle exceptions and errors through its exception handling mechanisms, which include both standard exceptions provided by the platform and exceptions that developers can create. - Salesforce CRM Online Training
Here are some common types of exceptions and errors you might encounter in Salesforce:
1. DML Exceptions: These exceptions occur when performing database operations such as insert, update, delete, or undelete records using DML statements. Examples include `System.DmlException` and `System.Database.SaveResult`.
2. Query Exceptions: These exceptions occur when executing SOQL (Salesforce Object Query Language) queries. Examples include `System.QueryException`.
3. Governor Limit Exceptions: Salesforce enforces various governor limits to ensure the stability and performance of the platform. When these limits are exceeded, governor limit exceptions are thrown. Examples include `System.LimitException`. - Salesforce CRM Training ...
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4. Custom Exceptions: Developers can define their own custom exceptions by extending the `Exception` class. This allows them to handle specific error conditions within their applications.
5. Apex Exception Methods: Salesforce provides methods in the `System` namespace for handling exceptions, such as `addError()` method to add custom error messages to sObjects and `addError()` method in Apex classes to add custom error messages to a page message.
6. Validation Rule Errors: When records fail to meet validation criteria defined by validation rules, Salesforce throws a validation rule error.
7. Apex Trigger Exceptions: Exceptions can occur within Apex triggers when processing records. These exceptions can be caught and handled appropriately within the trigger or by using try-catch blocks.
8. Apex Callout Exceptions: Exceptions can occur when making HTTP callouts from Apex, such as timeouts or connectivity issues. These exceptions can be caught and handled to implement proper error handling logic. - Salesforce CRM Training Course
These are just some examples, and the Salesforce platform provides a robust set of tools and mechanisms for handling exceptions and errors in various scenarios to ensure the reliability and stability of applications built on the platform.

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