Error management

Errors that happen in the context of the SDK are wrapped in a type of exception: D2Error, with the following fields:

Attribute	Type	Optional	Description
errorComponent	D2ErrorComponent	true	Source of the error: Database, SDK or Server.
errorCode	D2ErrorCode	true	SDK-defined unique error code.
errorDescription	String	true	Description of the error in english (technical details, just for logs and debugging).
httpErrorCode	Integer	false	If caused by HTTP request, HTTP error code.
originalException	Exception	false	Original Java Exception causing the error, if any.

Any operation requested to the SDK can throw an error.

• For suspend operations, the error is thrown directly and can be caught as usual:

  try {
      d2.userModule().suspendLogIn(username, password, url)
  } catch (d2Error: D2Error) {
      Log.e("LOGIN", "${d2Error.errorComponent()} ${d2Error.httpErrorCode()} ${d2Error.errorCode()}")
  }

• For operations returning RxJava objects, the errors can be extracted in the following way:

  d2.userModule().rxLogIn(username, password, url)
      .subscribe(
          {user ->},
          { error ->
              if (error is D2Error) {
                  Log.e("LOGIN", "${error.errorComponent()} ${error.httpErrorCode()} ${error.errorCode()}")
              }
          },
      )

• For blocking operations, it is also possible to retrieve a D2Error. The errors can be extracted by catching them as shown in the following code snippet:

  try {
      d2.userModule().blockingLogIn(username, password, url)
  } catch (e: Exception) {
      val cause = e.cause
      if (cause is D2Error) {
          Log.e("LOGIN", "${cause.errorComponent()} ${cause.httpErrorCode()} ${cause.errorCode()}")
      }
  }

D2Errors are persisted in the Database when they occur, so they can be analyzed afterwards and diagnose possible problems. They can be accessed through it's own repository:

d2.maintenanceModule().d2Errors()
    .byD2ErrorComponent().eq(D2ErrorComponent.Server)
    .suspendGet()

The SDK team is now working together with the core team in order to provide a full list of common error codes, but it's still a work in progress.