BTP - GET_USER_ALIAS returns empty value

Question

Hi I made my first Hello World in BTP and it didn't show my user alias...

Why?

CLASS zpo_hello_world DEFINITION
  PUBLIC
  FINAL
  CREATE PUBLIC.

  PUBLIC SECTION.
  INTERFACES if_oo_adt_classrun.
  PROTECTED SECTION.
  PRIVATE SECTION.
ENDCLASS.


CLASS zpo_hello_world IMPLEMENTATION.
  METHOD if_oo_adt_classrun~main.
  out->write( |Hello World ! ({ cl_abap_context_info=>get_user_alias( ) })| ).

  ENDMETHOD.

ENDCLASS.

Answer 1

Some of the methods in cl_abap_context_info can only be used in a cloud environment.

cl_abap_context_info=>

New Method	Old Environemnt
ET_SYSTEM_DATE	SYST-DATUM
GET_SYSTEM_TIME	SYST-UZEIT
GET_USER_TECHNICAL_NAME	SYST-UNAME
GET_USER_LANGUAGE_ABAP_FORMAT	SYST-LANGU
GET_USER_LANGUAGE_ISO_FORMAT	ISO format for language
GET_USER_TIME_ZONE	SYST-TZONE
GET_USER_ALIAS	Alias of user master data (Cloud)
GET_SYSTEM_URL	URL of the system (Cloud)
GET_USER_FORMATTED_NAME	BAPI_USER_GET_DETAIL
GET_USER_DESCRIPTION	BAPI_USER_GET_DETAIL
GET_USER_BUSINESS_PARTNER_ID	Business-Partner-ID of the user (Cloud)

(seehere )

Thus means if you run On-Premise those methods will not return any value as far as I know.

But I just saw that you are using the BTP abap cloud example. I've also tested it here it seems that there no alias is set for the users.

You can verify your user with the get_user_business_partner_id -method which is only valid in cloud.

  METHOD if_oo_adt_classrun~main.
    TRY.
        out->write( |Hello World { cl_abap_context_info=>get_user_business_partner_id( ) }| ).
      CATCH cx_abap_context_info_error.
    ENDTRY.
  ENDMETHOD.

I'm not sure weather you can set a user alias with transaction SU1 due there is no SAP Gui support I guess.