Error Handling

There are many reasons for errors to occur when developing software. The SAP Cloud SDK tries to provide as much information as possible and necessary to understand what caused an error. Generally speaking, there is no difference in handling errors when working with the SAP Cloud SDK. However, some errors are caused by underlying problems. In these cases, the SAP Cloud SDK throws an ErrorWithCause, that allows access to the immediate cause and root cause of this error. These can be accessed by the cause and rootCause properties on ErrorWithCause.

In the example below, we try to create a business partner against https://example.com as a destination. As this is not an SAP S/4HANA system, this will fail and the error reveals the cause and root cause of the failure.

import { businessPartnerService } from './generated/business-partner-service';
const { businessPartnerApi } = businessPartnerService();

businessPartnerApi
  .requestBuilder()
  .create(BusinessPartner.builder().build())
  .execute({ url: 'https://example.com' })
  .catch(err => {
    console.log('Error:', err.message);
    console.log('Cause:', err.cause?.message);
    console.log('Root cause:', err.rootCause?.message);
  });

The example above will yield the following output:

Error: Create request failed!
Cause: post request to https://example.com/sap/opu/odata/sap/API_BUSINESS_PARTNER failed!
Root cause: Request failed with status code 404

The final error is an ErrorWithCause that was caused by another ErrorWithCause. The root cause is an Error and reveals that the requested URL does not exist.

Debug `AxiosError`

A common error message is "Request failed with status code XXX", which is a typical error message of AxiosError. It might occur, when sending an HTTP request via axios client, and fails due to e.g., the following reasons:

authentication failed (401)
unauthorized request (403)

However, instead of this general error message, the HTTP response body contains more meaningful details of the error. You can check the example below about how to print the response body, when the root cause is an AxiosError:

businessPartnerApi
  .requestBuilder()
  .getAll()
  .top(1)
  .addCustomHeaders({ APIKey: 'my-api-key' })
  .execute({ url: 'https://sandbox.api.sap.com/s4hanacloud' })
  .catch(err => {
    console.log('Message:', err.rootCause?.message);
    console.log('Response body:', err.rootCause?.response?.data);
  });

The code snippets above will result in the following output, when the request is sent during a planned downtime.

Message: Request failed with status code 503
Response body: {
  code: 'SERVICE_UNAVAILABLE',
  message: 'From XXX until XXX there is a planned downtime for the API sandbox system. During this period you cannot use the Try it Out feature on our API sandbox system to test an API service.'
}

tip

If you want to see the complete root cause of an error object, add the following log statement:

console.log('Complete root cause error object:', err.rootCause);

Debug AxiosError​

Debug `AxiosError`