Does anybody know of a tested means to do this. JIRA site does not support this. Very much needed hoping somebody can help. Have posted it on jira forum also but no replies yet
http://forums.atlassian.com/thread.jspa?threadID=42414&tstart=0
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246answers:
2What you asked in the forum is how to have one username in LDAP and another in JIRA. That's tricker. The safest way to change the username (e.g. jsmith to bobsmith) is to create bobsmith and reassign issues from jsmith to him. Then change the user details of jsmith to indicate that it is not in use anymore. Another way is to export as XML, change all instances very carefully and then reimport. Much more risky, a bit neater in the end.
Sad to say but I just ended changing all the tables into the database that use username instead of user id. It worked very well for me. It was quite boring but works!
Just checked this and I find mdoar answer. Probably you should try that way first. If it doesn't work then use my one as I was in the same scenario as you are where jira usernames and LDAP usernames don't match.