CNTL_ERROR while running a custom report program in background mode

Question

Hi,
I am running a report in background on daily basis. I am using cl_gui_custom_container class here and calling the constructor of this class. I am getting a CNTL_ERROR exception at this point. But if i run the same report directly, it is not throwing any exception. The problem is if i schedule it to background. I am not able to sort it out.
I've written the following code below:
I did apply the logic that you'd mentioned.
I've implemented the code as below.
IF  gr_container IS INITIAL.
*** Check whether the program is run in batch or foreground
    IF CL_GUI_ALV_GRID=>OFFLINE( ) IS INITIAL.
* Run in foreground
      CREATE OBJECT gr_container
        EXPORTING
          container_name = 'WORK_AREA_CONTAINER'.
      CREATE OBJECT lv_grid
        EXPORTING I_PARENT = gr_container.
    ELSE.
* Run in background
      CREATE OBJECT lv_grid
        EXPORTING
          I_PARENT = gr_dockcontainer.
      ENDIF.
      ENDIF.
i_parent_control = gr_dockcontainer.
        CREATE OBJECT m_base_splitter
        EXPORTING
          parent            = i_parent_control
          ROWS              = 1
          columns           = 2
        EXCEPTIONS
          cntl_error        = 1
          cntl_system_error = 2
          OTHERS            = 3.
        CALL METHOD m_base_splitter->get_container
        EXPORTING
          row       = 1
          column    = 2
          RECEIVING
          container = m_splitter_right_part
        EXCEPTIONS
          OTHERS    = 1.
After I've implemented the above code I'm getting the following error in the batch job:
Category               ABAP Programming Error
Runtime Errors         OBJECTS_OBJREF_NOT_ASSIGNED
Except.                CX_SY_REF_IS_INITIAL
You attempted to use a 'NULL' object reference (points to 'nothing')
access a component (variable: "M_BASE_SPLITTER").
An object reference must point to an object (an instance of a class)
before it can be used to access components.
Either the reference was never set or it was set to 'NULL' using the
CLEAR statement.
Would you be able to help me in the above issue?
Regards,
Mandeep

Answer 1

Hi Alexander,
Yes I'd declared gr_dockcontainer as type ref to CL_GUI_DOCKING_CONTAINER. And I've now replaced the previous code and wwrote the below code :
gr_container IS INITIAL.
***Check whether the program is run in batch or foreground
      IF CL_GUI_ALV_GRID=>OFFLINE( ) IS INITIAL.
***Run in foreground
        CREATE OBJECT gr_container
          EXPORTING
            container_name = 'WORK_AREA_CONTAINER'.
        CREATE OBJECT lv_grid
          EXPORTING
            I_PARENT = gr_container.
      ELSE.
***Run in background
        CREATE OBJECT gr_dockcontainer
          EXPORTING
            NAME = 'WORK_AREA_CONTAINER'.
      ENDIF.
    ENDIF.
= gr_dockcontainer.
    CREATE OBJECT m_base_splitter
      EXPORTING
        parent            = i_parent_control
        ROWS              = 1
        columns           = 2
      EXCEPTIONS
        cntl_error        = 1
        cntl_system_error = 2
        OTHERS            = 3.
    CALL METHOD m_base_splitter->get_container
      EXPORTING
        row       = 1
        column    = 2
      RECEIVING
        container = m_splitter_right_part
      EXCEPTIONS
        OTHERS    = 1.
But after implementing the above code I'm facing the same issue of CTRL ERROR- " GUI cannot be reached".
Please guide me through this.
Regards,
Mandeep