ALV Grid OO Error

Former Member — Thu, 04 Oct 2007 18:19:03 GMT

Hi Guys,

When i am executing the program for ALV grid using OO concepts i got thisn type of error

"Short text

Access via 'NULL' object reference not possible.

What happened?

Error in the ABAP Application Program

The current ABAP program "Z_TEST_PGM" had to be terminated because it has

come across a statement that unfortunately cannot be executed.

Error analysis

An exception occurred that is explained in detail below.

The exception, which is assigned to class 'CX_SY_REF_IS_INITIAL', was not

caught in

procedure "ALVGRID_OO_DISPLAY" "(FORM)", nor was it propagated by a RAISING

clause.

Since the caller of the procedure could not have anticipated that the

exception would occur, the current program is terminated.

The reason for the exception is:

You attempted to use a 'NULL' object reference (points to 'nothing')

access a component (variable: "GRID").

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."

The code for this one is .

Data : grid type ref to cl_gui_alv_grid,

g_custom_container type ref to cl_gui_custom_container,

FCAT TYPE LVC_T_FCAT,

gt_final1 type table of t_Final_out.

Initialization.

v_repid = sy-repid.

set screen '101'.

MODULE STATUS_0101 output.

if g_custom_container is initial .

create object g_custom_container

Exporting

Container_name = 'CCCONTAINER'.

Create Object grid

Exporting

I_Parent = g_custom_container.

Endif.

CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'

EXPORTING

I_STRUCTURE_NAME = 't_final_out'

CHANGING

CT_FIELDCAT = FCAT[].

ENDMODULE.

Perform ALVGRID_OO_Display.

Form ALVGRID_OO_Display.

*set screen '101'.

Call Method grid->set_table_for_first_display

Exporting I_Structure_name = 't_final_out'

Changing it_outtab = gt_final1.

Endform.

't_final_out' is the final output Structure of the Internal table.

Please respond to this thread.

Thanks,

Gopi

Re: ALV Grid OO Error

Former Member — Fri, 05 Oct 2007 12:49:53 GMT

Obi Wan Kenobi

Re: ALV Grid OO Error

Former Member — Fri, 05 Oct 2007 12:57:46 GMT

Hi Gopi,

Please mention the fieldcatalog internal table also to the Method: Set table for first display.

Check

Re: ALV Grid OO Error

suredarreddy_pulimamidi — Fri, 05 Oct 2007 13:03:44 GMT

t_final_out is a local structure do n't give this structure create a global structure in se11 with the fields used and pass that structure to FM 'LVC_FIELDCATALOG_MERGE'. this will sove your problem.

<b>if helpful reward some points.</b>

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