Gateway Error Handling and Message Container

Explanation

Good OData services do not return generic dumps or unclear errors. They return meaningful business or technical errors with proper HTTP response behavior. Gateway provides exception classes such as /IWBEP/CX_MGW_BUSI_EXCEPTION and /IWBEP/CX_MGW_TECH_EXCEPTION. Business exceptions are used for validation or business rule failures. Technical exceptions are used for technical failures. The message container can collect one or more messages and return them to the frontend. Clear error handling reduces support effort and improves Fiori user experience.

Code example

* Purpose:* Return a meaningful business error from OData service.* Fiori/client can show this message to the user. DATA(lo_msg_container) = mo_context->get_message_container( ). * Add business validation messagelo_msg_container->add_message(  iv_msg_type   = 'E'  iv_msg_id     = 'ZODATA'  iv_msg_number = '001'  iv_msg_text   = 'Customer is mandatory for order creation' ). * Raise Gateway business exception with message containerRAISE EXCEPTION TYPE /iwbep/cx_mgw_busi_exception  EXPORTING    message_container = lo_msg_container.

Real project scenario

A sales order create service returns clear messages for missing customer, invalid material and blocked sales area instead of a generic internal server error.

Common mistakes

- Letting short dump reach frontend. - Returning generic error messages. - Using technical exception for business validation. - Not collecting multiple validation messages.

Best practices

- Use business exception for validation errors. - Use technical exception for technical failures. - Return clear messages. - Avoid uncontrolled dumps.

Interview angle

Interviewers may ask how to send error message to Fiori from Gateway. Mention message container and business exception.