topic Re: JSON-to-ABAP Deserialize in Application Development and Automation Discussions

JSON-to-ABAP Deserialize

konstantinos_vassiliadis — Mon, 20 Nov 2017 11:26:40 GMT

Dear experts,

I want to deserialize JSON data to ABAP structures. The ERP system is SAP_BASIS 700 and the following class methods are not available:

/ui2/cl_json=>deserialize
cl_trex_json_deserializer

So I am using the class cl_hrpayfr_json_deserializer which has a method DESERIALIZE that has input a variable of type string and returns a parameter of type ANY.

I want to deserialize the data to a structure and I understand that the return parameter of type ANY is a field symbol (?)

When I execute the code I get a runtime error of an unassigned field symbol although prior to calling the deserialize method I assign the target structure to the return parameter of type ANY.

Has anyone used the above method or used another method of deserializing?

Kind regards,

Konstantinos

Re: JSON-to-ABAP Deserialize

Sandra_Rossi — Mon, 20 Nov 2017 13:09:42 GMT

No, of course you can't use a field symbol that you didn't assign first (ABAP basics).

Probably this parameter should be a complex structure data object corresponding to the input JSON (structure field names should probably be equal to the names in the JSON).

Maybe, instead of using this unreleased class cl_hrpayfr_json_deserializer (might be deleted in a future release, I don't have it in my ECC 6.0 EHP 7), you could use an open project, for instance https://github.com/cesar-sap/abap_fm_json . Of course, probably you will have to downport the code to ABAP 7.0.

Re: JSON-to-ABAP Deserialize

retired_member — Mon, 20 Nov 2017 13:31:20 GMT

"I want to deserialize the data to a structure and I understand that the return parameter of type ANY is a field symbol (?)"

I fear, you have to understand typing of parameters and the concept of field symbols first.

Re: JSON-to-ABAP Deserialize

konstantinos_vassiliadis — Mon, 20 Nov 2017 13:57:14 GMT

I do have understanding but I do not understand how else to deserialize input JSON.

Re: JSON-to-ABAP Deserialize

retired_member — Mon, 20 Nov 2017 14:41:51 GMT

"I do have understanding"

Then please debug to check where and why the exception occurs.