How to create avatar issuetype in JIRA Server using JIRA Server REST API oauth client?

[Deleted user]

https://docs.atlassian.com/software/jira/docs/api/REST/7.6.1/#auth/1/session-login uses basic authentication and cookies, in curl, to create an avatar issuetype. However, I am not seeing an example using JIRA REST API oauth client. 

I have tried the equivalent of the curl command below using Java and successfully got the JSESSIONID from the response header.

 curl -c cookiejar.txt -X POST -u admin:admin -H "X-Atlassian-Token: no-check" \
   -H "Content-Type: image/png" --data-binary @mynewavatar.png \
   'http://localhost:8090/jira/rest/api/2/issuetype/1/avatar/temporary?filename=mynewavatar.png'

However, when I add a cookie with the same JSESSIONID to the second request, it returned a 500 response code with the following message:

com.google.api.client.http.HttpResponseException: 500
{"errorMessages":["Uploading the avatar has failed. Please check that you are logged in and have sufficient permissions."],"errors":{}}

I also tried getting the JSESSIONID using basic authentication and passed the JSESSIONID to the second request....that worked.

Could someone please explain to me why basic authentication JSESSIONIDs work but JIRA Server REST API oauth client JSESSIONIDs do not? 

Thank you in advance.

[Andrea Guarino]

Same here! Any explanation?