How to capture Exception error message in Odata ?

Question

Hi,
  I am new to sap gateway. Currently i am creating a Odata Service through the transaction SEGW. In the query i have mapped a RFC. When i execute the service sometimes the RFC throws exception like 'No data Found'. But i dont know how to capture the exception returned from the RFC.
I read some threads which says use
RAISE EXCEPTION TYPE /IWBEP/CX_MGW_BUSI_EXCEPTION
      EXPORTING
        textid            = /iwbep/cx_mgw_busi_exception=>business_error
        message       =  lv_text
        message_container = io_message_container.
My doubt is since i have not done any code in the DPC method. As said in many threads should i go to DPC_EXT method and redefine the method or how to capture the exception.
Kindly advise. Thanks in advance

Answer 1

Hello Velsankar,
You need not to capture the error messages explicitly by writing custom code in you DPC_EXT if you are using service builder when the return error message table is of type BAPIRET2.
GW itself will handle and return the error messages.
If at all the return error message table is of different type , i mean to say if it is not of type BAPIRET2 then you need to capture explicitly.
The below is the code you need to write in DPC_EXT to capture.
DATA: LO_MECO TYPE REF TO /IWBEP/IF_MESSAGE_CONTAINER.
DATA: LX_BUSI_EXC TYPE REF TO /IWBEP/CX_MGW_BUSI_EXCEPTION.
        LO_MECO = MO_CONTEXT->GET_MESSAGE_CONTAINER( ).
         LO_MECO->ADD_MESSAGES_FROM_BAPI( IT_BAPI_MESSAGES = LT_ERR_RET_TAB ).
         CREATE OBJECT LX_BUSI_EXC
           EXPORTING
             MESSAGE_CONTAINER = LO_MECO.
         RAISE EXCEPTION LX_BUSI_EXC.
Note : where LT_ERR_RET_TAB is your internal table where you would have captured all the error messages.
That is it. You will be able to see the messages .
Regards,
Ashwin