following way you can delete labels from issue
it will return set of lables which are appended to issue from that set you can delete label if ur deleting one label you have to update remaining set using
if you are deleteing all labels then you have to set labels with empty set
let me know if have any question
Normally For Issue Object don't have any methods to set values. you have to use Mutable Issue to set values,
you can find that method at http://docs.atlassian.com/jira/4.4.1/com/atlassian/jira/issue/MutableIssue.html#setLabels(java.util.Set)
still if you have question let me know
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