Issue Summary

REST API /rest/api/2/group/member returns a 500 error when the groupname parameter includes curly braces {}

Steps to Reproduce

1. Setup Jira datacenter version 10.x.x version.
2. Create a new group with name containing {} example :"group{}test" and add users to the group

1. Make a rest api call to the API endpoint "rest/api/2/group/member?groupname=group{}test"

Expected Results

• API displays the actual resutls in JSON format.

Actual Results

• Jira API fails with an error "Sorry, we had some technical problems during your last operation."

Java.lang.IllegalArgumentException: Illegal character "}" at position 19 is not allowed as a start of a name in a path template "groupname=%22group{}test%22". 

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available