varun_ramesh created OLINGO-1567:
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Summary: Expected item not found exception while parsing batch
response
Key: OLINGO-1567
URL: https://issues.apache.org/jira/browse/OLINGO-1567
Project: Olingo
Issue Type: Bug
Components: odata4-client
Affects Versions: (Java) V4 4.8.0
Environment: Not Applicable
Reporter: varun_ramesh
Attachments: sample_request.txt, sample_response.txt
While parsing batch changeset response, any of the changeset may fail (can have
response code > 300). As per spec, a batch request and response must be
structurally identical with an exception.
# When a request within a change set fails, the change set response is not
represented using the multipart/mixed media type. Instead, a single response,
using the application/http media type, is returned that applies to all requests
in the change set and MUST be a valid OData error response.
There is an issue in an iterator of the class ODataChangesetResponseItem.java
where hasNext() returns true but when next() is called "IllegalStateException :
Expected item not found" exception is thrown.
When the condition as mentioned in point 1 occurs, the iterators' hasNext()
gives us true indicating there is a next element whereas fetching the element
using next() gives an exception. This will happen when there are multiple
changeset parts but the remote service gives failure response for only one
changeset part. I have attached a sample request and response too.
On the other hand even if we set continueOnError to false, when the service
gives all the failure response, ODataChangesetResponseItem's iterator will
parse only the first response. Ideally there seems to be a flaw in the iterator
design. I have a unit test in this project
[https://github.com/varunrr/olingo-response] reproducing the scenario where the
backend service is https://services.odata.org/TripPinRESTierService.
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