Ranking issues only possible if customFieldId for Rank field is available

Hi support,

I have a problem with ranking issues inside a sprint. For that I am using the rest endpoint

http://

{HOST}

/rest/greenhopper/latest/sprint/rank

with the following params:

{ addToBacklog = false; idOrKeyBefore = "CDTPC-7"; idOrKeys = ( "CDTPC-1" ); sprintId = 187; }

Unfortunately I get the following error:

{"status-code":500,"stack-trace":"java.lang.NullPointerException\n\tat com.atlassian.greenhopper.web.rapid.sprint.SprintRankResource$1.call(SprintRankResource.java:113)\n\tat com.atlassian.greenhopper.web.rapid.sprint.SprintRankResource$1.call(SprintRankResource.java:78)\n\tat com.atlassian.greenhopper.web.util.RestCall.response(RestCall.java:48)\n\tat com.atlassian.greenhopper.web.AbstractResource.response(AbstractResource.java:60)\n\tat com.atlassian.greenhopper.web.rapid.sprint.SprintRankResource.updateSprintAndRank(SprintRankResource.java:77)\n\tat sun.reflect.GeneratedMethodAccessor5938.invoke(Unknown......

I figured out that for making it work the "customFieldId"-parameter is missing. Is it really necessary to also add this parameter to the request? It would be nice if in case the id is not added the default field would be used. What is the best way to retrieve the right custom field id for the ranking field with rest?

The question has been posted in the support forum, no answer yet

https://answers.atlassian.com/questions/211566/greenhopper-rank-issue-via-rest-api

Thanks!