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I would like to make a script listener with trigger- issue updated.
Inside the code I put a condition- if it's true I want that the update that made didn't save, and the previous value will keep.
fixVersions = x
update issue - fixVersions = Y
if condition = true
fixVersions = x
You can easily achieve this by using the "ChangeHistoryManager" to fetch the values for a specific field in the script listener, for example for Fix Versions something like this should do the trick
List<ChangeItemBean> changeList = changeHistoryManager.getChangeItemsForField(issue, "Fix Version")
And then use the changeList to fetch the ChangeItemBean.
But as you said in your description
if it's true I want that the update that made didn't save, and the previous value will keep.
This is not possible is Jira to "not" save the value because listener is fired after event has happened so the fixVersion will become value Y in DB but your listener script can change the value back to old value X thus to the end-user it will appear that the value has never changed but actually your listener overrides the new values with the last value.
You need to add this
ChangeHistoryManager changeHistoryManager = ComponentAccessor.getChangeHistoryManager();
And these imports
Issue.setFixVersion expects an list but you are passing a single string which is not correct, thus you see the error, please go through the APIs here
It returns lists of ChangeItemBean which you need to parse to get the string value which you want