z_first_program

[Former Member]

Hello everyone,

I just started my abap object programming and I have a error that according to the book code is ok, but does not run, compiles but crashes.

Does anyone sees something wrong with it?

Thanks in advance

Carlos

*&---------------------------------------------------------------------*
*& Report  Z_MYFIRST_PROGRAM                                           *
*&                                                                     *
*&---------------------------------------------------------------------*
*&                                                                     *
*&                                                                     *
*&---------------------------------------------------------------------*

REPORT  z_myfirst_program.

*---------------------------------------------------------------------*
*       CLASS appliction DEFINITION
*---------------------------------------------------------------------*
*       ........                                                      *
*---------------------------------------------------------------------*
CLASS application DEFINITION.
  PUBLIC SECTION.

    METHODS: consturctor,
    read_data IMPORTING l_carrid TYPE spfli-carrid,
    fill_list.

  PRIVATE SECTION.

    DATA: spfli_tab TYPE TABLE OF spfli,
    container TYPE REF TO cl_gui_custom_container,
    alv_list TYPE REF TO cl_gui_alv_grid.

ENDCLASS.

*---------------------------------------------------------------------*
*       CLASS appliction IMPLEMENTATION
*---------------------------------------------------------------------*
*       ........                                                      *
*---------------------------------------------------------------------*
CLASS application IMPLEMENTATION.
  METHOD consturctor.

    CREATE OBJECT container
      EXPORTING container_name = 'LIST_AREA'.

    CREATE OBJECT alv_list
      EXPORTING i_parent = container.

    CALL METHOD alv_list->set_table_for_first_display
      EXPORTING i_structure_name = 'SPFLI'
      CHANGING it_outtab = spfli_tab.

  ENDMETHOD.

  METHOD read_data.

    SELECT *
    FROM spfli
    INTO TABLE spfli_tab
    WHERE carrid = l_carrid.

  ENDMETHOD.

  METHOD fill_list.

       CALL METHOD alv_list->refresh_table_display.   "<< CRASHES HERE
                                     "OBJECTS_OBJREF_NOT ASSIGNED
  ENDMETHOD.

ENDCLASS.

TABLES spfli.

DATA object_ref TYPE REF TO application.

START-OF-SELECTION.
  CREATE OBJECT  object_ref.
  CALL SCREEN 100.


*---------------------------------------------------------------------*
*       MODULE satus_100 OUTPUT                                       *
*---------------------------------------------------------------------*
*       ........                                                      *
*---------------------------------------------------------------------*
MODULE status_0100 OUTPUT.
  SET PF-STATUS 'SCREEN_100'.

    CALL METHOD object_ref->fill_list.

ENDMODULE.

*---------------------------------------------------------------------*
*       MODULE user_command_0100 INPUT                                *
*---------------------------------------------------------------------*
*       ........                                                      *
*---------------------------------------------------------------------*
MODULE user_command_0100 INPUT.
  IF sy-ucomm = 'BACK' OR
     sy-ucomm = 'EXIT' OR
     sy-ucomm = 'CANCEL'.
    LEAVE PROGRAM.
  ELSE.
    CALL METHOD object_ref->read_data
    EXPORTING l_carrid = spfli-carrid.
  ENDIF.
ENDMODULE.

[Former Member]

The constructor name is misspelled:

METHODS: consturctor,

and

METHOD consturctor.

should read

METHODS: constructor,

and

METHOD constructor.

Because it is misspelled, it is not being executed when the object is created.

Let us know how it goes.

[Former Member]

Hi charles,

I must say that Charles has an amazing eye for detail !!

Regards,

Anand Mandalika.

[Former Member]

Charles,

Thank you very much and I am very sorry about this silly error. But, since I am new on this I just panic and started looking for a different cause than syntax.

Thanks again

Carlos