A CRUD operation violated the foreign key constraints. Why should you register an error handler in your service implementation for the exception of the CAP SDK for Node.js?

Question

Options

• ATo force the execution of the CRUD operation
• BTo ensure that the end user receives a message
• CTo avoid a break in the app execution
• DTo provide a meaningful error message

• A
  9% (2)
• B
  5% (1)
• C
  5% (1)
• D
  82% (18)

Explanation

Registering an error handler in your CAP SDK service implementation lets you intercept the raw database exception and transform it into a clear, user-friendly message - for example, replacing a cryptic foreign key violation string with something like "The referenced entity does not exist." Without this handler, the CAP framework may propagate the low-level database error text directly to the client, which is confusing and potentially exposes implementation details.

Why the distractors are wrong:

• A (force execution): An error handler handles the failure after it occurs - it cannot and should not bypass database constraints or retry the operation.
• B (ensure the user receives a message): The CAP framework already returns some error response to the client automatically; the handler's value is in making that message meaningful, not merely ensuring one exists.
• C (avoid breaking app execution): CAP's built-in error handling already prevents an unhandled exception from crashing the server - you're not registering the handler to keep the app alive.

Memory tip: Think of an error handler as a translator, not a safety net. The app won't crash without it, and the user will still get a response - but only the handler turns a database-level error into a human-readable one. When you see "meaningful error message," that's your keyword for option D.

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