How to assign a user for issues while creating itself through rest API

[tamiltamil]

Hi,

I am done with creating issue using rest API.Now i am want assign the the assignee for issue while creating itself.

I tried below example ,

{
"fields":{
"summary":"assigneeeee name",
"project":{
"key":"MAIL"},

"issuetype":{"name":"Bug"},
"description":"ISSUE",
"assignee":{
"name":"user1"
}
}}

It shows follwing error: net.oauth.OAuthProblemException: HTTP/1.1 400 Bad Request

please help me in this.

[Nic Brough -Adaptavist-]

It's not the assignee that is the problem, you aren't logging in correctly.  Check the way you are authenticating.