ALV grid Error-Pleaseeeeeeeee

Former Member — Thu, 04 Oct 2007 19:07:00 GMT

Hi Guys ,

I am trying to create a ALV Grid using OO Concepts.

I am getting an error like " Access via 'NULL' object reference not possible."

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: "GRID1").

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 is below.

Data : grid1 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.

set screen '101'.

MODULE STATUS_0101 output.

if g_custom_container is initial .

create object g_custom_container

Exporting

Container_name = 'CCCONTAINER'.

Create Object grid1

Exporting

I_Parent = g_custom_container.

Endif.

CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'

EXPORTING

I_STRUCTURE_NAME = 't_final_out'

CHANGING

CT_FIELDCAT = FCAT[].

ENDMODULE.

Call Method grid1->set_table_for_first_display

Exporting I_Structure_name = 'T_FINAL_OUT'

Changing it_outtab = gt_final1.

Can ahybody tell why i am getting this type of error.

Please reply to this thread.Full points will be rewarded.

Thanks,

Gopi.

Re: ALV grid Error-Pleaseeeeeeeee

Former Member — Thu, 04 Oct 2007 19:19:20 GMT

Check in debug, if your field catalog is getting populated correctly. I believe that is the cause of the error.

CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'

EXPORTING

<b>I_STRUCTURE_NAME = 't_final_out' Change it to 'T_FINAL_OUT'</b>

CHANGING

CT_FIELDCAT = FCAT[].

Re: ALV grid Error-Pleaseeeeeeeee

Former Member — Thu, 04 Oct 2007 19:33:11 GMT

Hi Gopi,

write the code in a separate sub-routine and not in a module pool.

You can check this by debugging and check for every object whether it has assigned or not.

<b>This error occured when Object is not referenced or not created properly. Check all Object creation process.</b>

reward points if usefull

Thanks

Sampath.

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ALV grid Error-Pleaseeeeeeeee

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Re: ALV grid Error-Pleaseeeeeeeee