Accessing batch responses for OData V4

[puja-saraswat]

Hello Team,

We're encountering an issue with the response of oData v4 batch request.
I've referred to the documentation for the Generic multipart batch request .

https://sap.github.io/cloud-sdk/docs/java/features/odata/generic-untyped-odata-client

Issue Description

an error occurs when executing batchResult.getResult(requestRead).

com.sap.cloud.sdk.datamodel.odata.client.exception.ODataResponseException: Unable to extract batch response item at position 1. The response contains only 0 items.

further debugging shows that batch result has HttpResponse but size of batchedresponses is 0.
batchResult.getBatchedResponses(); returns empty list.

Important information:
https://github.tools.sap/ComplaintHandling/ICHAMP/blob/03fda19b7d8760642bd27da64231a509372c5eb4/cmh-common/src/main/java/com/sap/ic/cmh/network/service/HttpService.java#L754

• Your code

// create an HTTP client
String servicePath = "sap/opu/odata4/sap/api_complaintprocessflowdetail/srvd_a2x/sap/complaintprocessflowdetail/0003/";
HttpClient httpClient = HttpClientAccessor.getHttpClient(destination);
// instantiate custom OData V4 batch request
ODataRequestBatch requestBatch = new  ODataRequestBatch(servicePath, ODataProtocol.V4);
ODataEntityKey key = new ODataEntityKey(ODataProtocol.V4)
				.addKeyProperty("P_SubsequentDoc", "65000781")
				.addKeyProperty("P_SubsequentDocItem", "10");
// instantiate custom OData ResourcePath request
ODataResourcePath functionPath =
		new ODataResourcePath()
			.addSegment("ComplaintProcessFlow", key).addSegment("Set");

ODataRequestReadByKey request = new ODataRequestReadByKey(servicePath,functionPath,"$expand=_SubsequentProcFlowDocItem($orderby=ProcessFlowLevel)", ODataProtocol.V4);
		requestBatch.addReadByKey(request);

ODataRequestResultMultipartGeneric  batchResult = requestBatch.execute(httpClient);
ODataRequestResultGeneric queryResult1 = batchResult.getResult(request);

• Expected outcome
  batchResult.getResult(request) should return List<List> batchResponseItems >0

• Actual outcome
  batchResult.getResult(request) should return List<List> batchResponseItems = 0

• Steps attempted to resolve the issue

• In case of issues with any of our VDMs:

  • What happens when a request is performed directly via an HTTP client tool such as Postman?
  • In case that succeeds please provide details on the request such as URL, query parameters, header parameters, prerequisite requests (e.g. CSRF token), etc.

• Potentially missing information (open questions you might have)

Impact / Priority

Affected development phase: Development

Impact:
customerComplaint-srv-2024-04-03 07_30_40.336+0000.txt
Blocked

Timeline: e.g. Go-Live is in 12 weeks.

Error Message

Please paste your stracktrace here within the backticks (replacing this comment)

Project Details

• SDK Version:

• Link to GitHub repo:
• Project type, for example:
  • CAP Project
  • SDK Maven Archetype
  • None of the above:
• Platform:
  • Cloud Foundry
  • Deploy with Confidence (Cloud Foundry)
  • None of the above:

---

Checklist

• Checked out the documentation and Stack Overflow
• Description provided with all relevant information
• Exception and stack trace provided
• Attached debug logs
• Attached dependency tree
• Provided Cloud SDK version & link to relevant source code

[MatKuhr]

Hi @puja-saraswat, can you please attach the server response body as plain text? In the logs the response is gzip encoded, so it's not readable. To get the response body as plain text you can for example access the HttpResponse -> HttpEntity of the response.

[puja-saraswat]

Hi @MatKuhr ,
Thanks for quick response.
In the logs, I have printed the value of batchResult.getHttpResponse().getEntity().getContent
exact line code:

String httpResponses = IOUtils.toString(batchResult.getHttpResponse().getEntity().getContent(),StandardCharsets.UTF_8);
log.info("========== HttpresponseReadKey: "+httpResponses);

You can search with "========== HttpresponseReadKey: " . the value follows this.

Please let me know if this would do, orlese I l get you batchResult.getHttpResponse().getEntity() value.

[MatKuhr]

Okay, so the issue seems to be that the server response is missing mandatory newlines. The RFC defining the batch format states:

After its boundary delimiter line, each body part then consists of a header area, a blank line, and a body area.

This causes the parsing to fail, as it can no longer distinguish between the HTTP header data, and the actual payload.
I used one of our unit tests to reproduce the error. You can check it out and try it yourself if you like, I pushed it to a branch: main...support/batch-response-parsing (on the branch I already added the missing newlines and it starts working as expected)

You could double-check if this is just an issue with how the log was printed. But if not, please raise an issue with the maintainer of the OData service. From the URL it looks like a service on S/4, but I'm not sure which one it is. But regardless, raising a support incident on support.sap.com is probably the way to go here.

[puja-saraswat]

Hi @MatKuhr ,

I am not very sure of logs, however I have the String value from debugging.
In that I see only difference between your changed file and the content value is newline between odata value and closing delimiter.
Could that be causing issue?

Single request Response:

--0283683D957F800CA1F54757305EDE8C0
Content-Type: application/http
Content-Length: 34759
content-transfer-encoding: binary
content-id: 1

HTTP/1.1 200 OK
Content-Type: application/json;odata.metadata=minimal;charset=utf-8
Content-Length: 34576
odata-version: 4.0
cache-control: no-cache, no-store, must-revalidate

{"@odata.context":"../$metadata#ComplaintProcessFlow(P_SubsequentDoc='65000781',P_SubsequentDocItem='10')/Set(_SubsequentProcFlowDocItem())","@odata.metadataEtag":"W/\"20240402032813\"","value":[{"PrecedingDocument":"151068","PrecedingDocumentItem":"20","PrecedingDocumentCategory":"C","DocumentTypeDescription":"Order","PrecedingDocStatus":"B","PrecedingDocStatusDesc":"In Process","_SubsequentProcFlowDocItem":[{"DocRelationshipUUID":"42010aef-4d5f-1eed-8c84-0173966e7d69","PrecedingDocument":"151068","PrecedingDocumentItem":"20","SubsequentDocument":"AMER201134","SubsequentDocumentItem":"20","SubsqntDocItmPrecdgDocument":"151068","SubsqntDocItmPrecdgDocItem":"20","SubsequentDocumentCategory":"J","DocumentDescription":"Delivery","SubsequentDocStatus":"C","SubsequentDocStatusDesc":"Completed","ProcessFlowLevel":"0","InspectionDocument":"","ReturnsInspectionItem":"0","InspDocCategoryValue":"","ReturnsInspectionStatusText":"","CustomerReturnType":""},{"DocRelationshipUUID":"42010aef-4d5f-1edd-8c84-0dd84b102539","PrecedingDocument":"151068","PrecedingDocumentItem":"20","SubsequentDocument":"90073301","SubsequentDocumentItem":"20","SubsqntDocItmPrecdgDocument":"AMER201134","SubsqntDocItmPrecdgDocItem":"20","SubsequentDocumentCategory":"M","DocumentDescription":"Invoice","SubsequentDocStatus":"A","SubsequentDocStatusDesc":"Completed","ProcessFlowLevel":"1","InspectionDocument":"","ReturnsInspectionItem":"0","InspDocCategoryValue":"","ReturnsInspectionStatusText":"","CustomerReturnType":""},{"DocRelationshipUUID":"42010aef-4d5a-1eed-8c86-234945b5dbb3","PrecedingDocument":"151068","PrecedingDocumentItem":"20","SubsequentDocument":"60014415","SubsequentDocumentItem":"10","SubsqntDocItmPrecdgDocument":"90073301","SubsqntDocItmPrecdgDocItem":"20","SubsequentDocumentCategory":"H","DocumentDescription":"Returns","SubsequentDocStatus":"C","SubsequentDocStatusDesc":"Completed","ProcessFlowLevel":"2","InspectionDocument":"","ReturnsInspectionItem":"0","InspDocCategoryValue":"","ReturnsInspectionStatusText":"","CustomerReturnType":""},{"DocRelationshipUUID":"42010aef-4d5a-1edd-8ee4-feca7d8f2056","PrecedingDocument":"151068","PrecedingDocumentItem":"20","SubsequentDocument":"60014544","SubsequentDocumentItem":"10","SubsqntDocItmPrecdgDocument":"90073301","SubsqntDocItmPrecdgDocItem":"20","SubsequentDocumentCategory":"H","DocumentDescription":"Returns","SubsequentDocStatus":"C","SubsequentDocStatusDesc":"Completed","ProcessFlowLevel":"2","InspectionDocument":"","ReturnsInspectionItem":"0","InspDocCategoryValue":"","ReturnsInspectionStatusText":"","CustomerReturnType":""},{"DocRelationshipUUID":"42010aef-4d5a-1eed-8ee5-ea11f95cf172","PrecedingDocument":"151068","PrecedingDocumentItem":"20","SubsequentDocument":"60014546","SubsequentDocumentItem":"10","SubsqntDocItmPrecdgDocument":"90073301","SubsqntDocItmPrecdgDocItem":"20","SubsequentDocumentCategory":"H","DocumentDescription":"Returns","SubsequentDocStatus":"C","SubsequentDocStatusDesc":"Completed","ProcessFlowLevel":"2","InspectionDocument":"","ReturnsInspectionItem":"0","InspDocCategoryValue":"","ReturnsInspectionStatusText":"","CustomerReturnType":""},{"DocRelationshipUUID":"42010aef-4d5a-1eee-85b1-5eab53c536d0","PrecedingDocument":"151068","PrecedingDocumentItem":"20","SubsequentDocument":"60018232","SubsequentDocumentItem":"10","SubsqntDocItmPrecdgDocument":"90073301","SubsqntDocItmPrecdgDocItem":"20","SubsequentDocumentCategory":"H","DocumentDescription":"Returns","SubsequentDocStatus":"C","SubsequentDocStatusDesc":"Completed","ProcessFlowLevel":"2","InspectionDocument":"","ReturnsInspectionItem":"0","InspDocCategoryValue":"","ReturnsInspectionStatusText":"","CustomerReturnType":""},{"DocRelationshipUUID":"42010aef-4d5a-1ede-85b1-a34863743037","PrecedingDocument":"151068","PrecedingDocumentItem":"20","SubsequentDocument":"60018233","SubsequentDocumentItem":"10","SubsqntDocItmPrecdgDocument":"90073301","SubsqntDocItmPrecdgDocItem":"20","SubsequentDocumentCategory":"H","DocumentDescription":"Returns","SubsequentDocStatus":"C","SubsequentDocStatusDesc":"Completed","ProcessFlowLevel":"2","InspectionDocument":"","ReturnsInspectionItem":"0","InspDocCategoryValue":"","ReturnsInspectionStatusText":"","CustomerReturnType":""},{"DocRelationshipUUID":"2359cc72-7f97-1ede-97da-f68a4b983942","PrecedingDocument":"151068","PrecedingDocumentItem":"20","SubsequentDocument":"65000074","SubsequentDocumentItem":"10","SubsqntDocItmPrecdgDocument":"90073301","SubsqntDocItmPrecdgDocItem":"20","SubsequentDocumentCategory":"H","DocumentDescription":"Returns","SubsequentDocStatus":"A","SubsequentDocStatusDesc":"Open","ProcessFlowLevel":"2","InspectionDocument":"","ReturnsInspectionItem":"0","InspDocCategoryValue":"","ReturnsInspectionStatusText":"","CustomerReturnType":""},{"DocRelationshipUUID":"1da811b3-755c-1ede-a4f1-a5c9b1a13e79","PrecedingDocument":"151068","PrecedingDocumentItem":"20","SubsequentDocument":"60022515","SubsequentDocumentItem":"10","SubsqntDocItmPrecdgDocument":"90073301","SubsqntDocItmPrecdgDocItem":"20","SubsequentDocumentCategory":"K","DocumentDescription":"Credit 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--0283683D957F800CA1F54757305EDE8C0--

Multiple requests response:

--CC101A3CEF7A7FDC69B50DDCF90AED4F0
Content-Type: application/http
Content-Length: 377
content-transfer-encoding: binary

HTTP/1.1 200 OK
Content-Type: application/json;odata.metadata=minimal;charset=utf-8
Content-Length: 196
odata-version: 4.0
cache-control: no-cache, no-store, must-revalidate

{"@odata.context":"../$metadata#ComplaintProcessFlow(P_SubsequentDoc='70004259',P_SubsequentDocItem='2')/Set(_SubsequentProcFlowDocItem())","@odata.metadataEtag":"W/\"20240325203959\"","value":[]}
--CC101A3CEF7A7FDC69B50DDCF90AED4F0
Content-Type: application/http
Content-Length: 377
content-transfer-encoding: binary

HTTP/1.1 200 OK
Content-Type: application/json;odata.metadata=minimal;charset=utf-8
Content-Length: 196
odata-version: 4.0
cache-control: no-cache, no-store, must-revalidate

{"@odata.context":"../$metadata#ComplaintProcessFlow(P_SubsequentDoc='60023270',P_SubsequentDocItem='2')/Set(_SubsequentProcFlowDocItem())","@odata.metadataEtag":"W/\"20240325203959\"","value":[]}
--CC101A3CEF7A7FDC69B50DDCF90AED4F0
Content-Type: application/http
Content-Length: 1159
content-transfer-encoding: binary
content-id: 3

HTTP/1.1 200 OK
Content-Type: application/json;odata.metadata=minimal;charset=utf-8
Content-Length: 978
odata-version: 4.0
cache-control: no-cache, no-store, must-revalidate

{"@odata.context":"../$metadata#ComplaintProcessFlow(P_SubsequentDoc='15000822',P_SubsequentDocItem='2')/Set(_SubsequentProcFlowDocItem())","@odata.metadataEtag":"W/\"20240325203959\"","value":[{"PrecedingDocument":"15000822","PrecedingDocumentItem":"2","PrecedingDocumentCategory":"H","DocumentTypeDescription":"Returns","PrecedingDocStatus":"C","PrecedingDocStatusDesc":"Completed","_SubsequentProcFlowDocItem":[{"DocRelationshipUUID":"619a6b26-351c-1eee-b2fb-ce55e25b8718","PrecedingDocument":"15000822","PrecedingDocumentItem":"2","SubsequentDocument":"EMEA006015","SubsequentDocumentItem":"20","SubsqntDocItmPrecdgDocument":"15000822","SubsqntDocItmPrecdgDocItem":"2","SubsequentDocumentCategory":"T","DocumentDescription":"Returns Delivery for Order","SubsequentDocStatus":"A","SubsequentDocStatusDesc":"Open","ProcessFlowLevel":"0","InspectionDocument":"","ReturnsInspectionItem":"0","InspDocCategoryValue":"","ReturnsInspectionStatusText":"","CustomerReturnType":""}]}]}
--CC101A3CEF7A7FDC69B50DDCF90AED4F0--

Thanks,
Puja

[MatKuhr]

Hi Puja, no I don't think that is an issue. When I copy/paste the payload you pasted above into the unit test then the parsing works as expected. So I can't reproduce the error with that.

Maybe when copying the payload from the debugger you added some newlines? Otherwise I'm not sure how the logs can differ from what you pasted here.. If you want to be 100% certain what is returned, you could send an additional header 'accept-encoding: identity' with the request to disable gzip compression. Alternatively you could run the same request using Postman or a similar tool.

[MattKuhr]

I tested this again and also couldn't reproduce this on version 5.3.0 you were using. So I don't think the recent changes on the changeset evaluation we did had any impact on the issue your observed. Perchance the upgrade to 5.7.0 you did also changed some dependencies or you had an older version of your app deployed when you were initially testing.

Anyhow, as it seems to be solved with the recent updating I am closing this for now. Please re-open if there still is some Problem with evaluating the response data.