Error in OVS!!

[Former Member]

i am getting error which is mentioned below regarding OVS,particularly when the browser is running slow and i am clicking 2nd time for the value help.

If anyone know the answer,give me the solution.

I will reward point.

error is like ....

The following error text was processed in the system EC6 : Access via 'NULL' object reference not possible.

The error occurred on the application server HSDNT24S12_EC6_03 and in the work process 0 .

The termination type was: RABAX_STATE

The ABAP call stack was:

Method: IF_WDR_OVS_LISTENER~MODIFY_RESULT_VIEW of program CL_WDR_VALUE_HELP_HANDLER=====CP

Method: WDDOMODIFYVIEW of program /1BCWDY/RZ2TAVAGXRRTKWWIR62K==CP

Method: IF_WDR_VIEW_DELEGATE~WD_DO_MODIFY_VIEW of program /1BCWDY/RZ2TAVAGXRRTKWWIR62K==CP

Method: DO_MODIFY_VIEW of program CL_WDR_DELEGATING_VIEW========CP

Method: MODIFY_VIEW of program CL_WDR_VIEW===================CP

Method: DO_MODIFY_VIEW of program CL_WDR_CLIENT_COMPONENT=======CP

Method: DO_MODIFY_VIEW of program CL_WDR_WINDOW_PHASE_MODEL=====CP

Method: PROCESS_REQUEST of program CL_WDR_WINDOW_PHASE_MODEL=====CP

Method: PROCESS_REQUEST of program CL_WDR_WINDOW=================CP

Method: EXECUTE of program CL_WDR_MAIN_TASK==============CP

thanks in advance,

Subhasis.

[Madhu2004]

HI,

DID U WRITE THE FOLLOWING CODE IN A METHOD :

types : begin of ist_fields,

carrid type spfli-carrid,

countryfr type spfli-countryfr,

cityfrom type spfli-cityfrom,

end of ist_fields.

data:

it_fields type ist_fields,

it_conn type table of spfli.

field-symbols : <lfs_input> type ist_fields,

<lfs_select> type spfli.

case ovs_callback_object->phase_indicator.

when 0.

call method ovs_callback_object->set_configuration

exporting

window_title = 'search Flights'

group_header = 'enter flight details'

• LABEL_TEXTS =

• TABLE_HEADER =

• COLUMN_TEXTS =

col_count = 1

• ROW_COUNT =

• TABLE_MULTI_SELECT =

.

when 1.

call method ovs_callback_object->set_input_structure

exporting

input = it_fields

• GROUP_HEADER =

• LABEL_TEXTS =

• WINDOW_TITLE =

.

when 2.

assign ovs_callback_object->query_parameters->* to <lfs_input> casting.

call method cl_wd_flight_model=>get_conns_by_carrid_cityfrom

exporting

i_carrid = <lfs_input>-carrid

i_countryfr = <lfs_input>-countryfr

i_cityfrom = <lfs_input>-cityfrom

importing

et_spfli_sflight = it_conn

.

call method ovs_callback_object->set_output_table

exporting

output = it_conn

• TABLE_HEADER =

• COLUMN_TEXTS =

.

when 3.

data:

node_flight type ref to if_wd_context_node,

elem_flight type ref to if_wd_context_element,

stru_flight type if_inputview=>element_flight .

assign ovs_callback_object->selection->* to <lfs_select> casting.

• navigate from <CONTEXT> to <FLIGHT> via lead selection

node_flight = wd_context->get_child_node( name = if_inputview=>wdctx_flight ).

node_flight->bind_structure(

exporting

new_item = <lfs_select> ).

AND ALSO IN THE CONTEXT DID U SELECT OBJECT VALUE SELECTOR IN INPUT HELP MODE3 AND OVS COMPONENT USAGE.

MADHU

[Former Member]

hi Madhu,

For OVS we have to write all these..i know that.

most of the time it is working properly.

But problem arises when the browser is running slow and i am clicking 2nd time for the value help.

[Former Member]

Hi Subhasis.

Errors that occur because the user ia able to click buttons more than once

can not be prevented, cause in this case more then one request are sent to the server. This is neither an OVS nor a WD4A issue but a generell web application problem.

Cheers,

Sascha

Message was edited by:

Sascha Dingeldey

[Former Member]

hi Sascha,

thanks for the reply.

is there any way to overcome it?

Application is giving dump and that is a serious problem...!

regards,

subhasis.

[Former Member]

Hi Subhasis,

no you cannot prevent this. If the browser is running slow somehow und was not able to disable all function on the screen, how will you prevent user from clicking twice?

I guess there is no way but ensure fast connection and clients with enough power so that the browser responses in a fast time.

Furthermore you must teach your user proper to make clear how to use the app.

Cheers,

Sascha

[Former Member]

I hope u are attempting to select a null value..if u are using a node please change the cardinality to 1..n. so that u may not have null values in the object value selector..i.e(OVS)..

[Former Member]

hi karthikeyan,

first of all thanks for the reply.

if i want to select NULL value then why most of the time application running properly without getting any error like 'NULL object reference'.

if i am accessing any NULL value the application throw that error message every time...is not it?

cardinality of the i am using is 1..1.

Message was edited by:

subhasis naskar