Error Handling

The code here shows how to customize error handling.

A user-defined exception, ConsumerArticleIsNoLongerAvailableException, is thrown from a resource service to demonstrate handling it. Note that this exception can be thrown from anywhere during request execution; a resource service is just used here for simplicity.

To handle the user-defined exception, AlternateExceptionHandler inherits from ExceptionHandler to:

• Customize the JSON:API error response by adding a meta entry when ConsumerArticleIsNoLongerAvailableException is thrown.
• Indicate that ConsumerArticleIsNoLongerAvailableException must be logged at the Warning level.

Additionally, the ThrowingArticle.Status property throws an InvalidOperationException. This triggers the default error handling because AlternateExceptionHandler delegates to its base class.