We are trying to connect the catalog as the standard function in shopping cart, but it is very difficult to simulate that program in our own codes. When we copy all the method and action from standard program that catalog connection related, there was an exception occured.
The short text is "Access via 'NULL' object reference not possible.".
The detail error analysis is below:
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 "ONACTIONCATALOG_OUT" "(METHOD)", 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.
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.
Do you have any good method to make the connection easily and simply?
The Catalog Search UI of SRM that is referred to as UI as aforementioned is a page which is capable of the selection of catalog items is linked from the shopping cart creation.
Our biz requirement content two scenarioes to processing the purchase requirement.
A. Create shopping cart via the catalog (PR) --> SRM PO Process --> SUS(PO and Invoice)
This is the standard SRM purchase scenario and we have already implemented that.
B. Create a requirement document via the catalog (This document is same with the SC but very simple, and we create this function by the own web dynpro program) --> transfer the requirement document to other purchasing system(none SAP) in our intranet.
So the key problems we faced are below:
1. How to connect to the catalog search UI from our own web dynpro program.
( If we connect the catalog via the MDM ABAP API, that will make the catalog serach UI could not be used;
Also it has been failed to simulate the function of SC's connection to the catalog;
So we decide to link the catalog serach UI via the URL, the linkage is "http://<J2EEserver:J2EEport>/SRM-MDM/SRM_MDM?sap-locale=EN&HOOK_URL=&mask=&namedSearch=General&username=&password=&catalog=<Repository Name>&server=&datalanguage=EN". )
2. How to transfer the catalog item data to our own web dynpro program.
If we link the catalog search UI by URL, we can not find any good method to transfer the catalog item data to our own program.
Our employees prefer 2 different SC UI, so the A implementation will be used.
We learned the logic of standard program and found that the Web Dynpro Component "/SAPSRM/WDC_UI_SC_DOTC_BD" content the methodes to connect the SRM-MDM catalog UI when the SC creation.
Also we find the core method "ONACTIONADDITEM_CATALOG" will trigger to get connection with catalog. But why we can not find any function to generate the OCI HOOK_URL in this method or in this Web Dynpro Component?
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