How update priority for subtask

[Ruslan]

Hi,guys. 

I have listener : issue created. 

I need copy field priority and flagged, when subtask create.

I started with priority,but this code dont work without exeptions:

if(!issue.isSubTask()){

      return

}

else{

 def parentIssue = issue.parentObject

 log.warn parentIssue.getPriority().getId()

issue.setPriorityId(parentIssue.getPriority().getId())

}

Field is not update.

pls help

[Ruslan]

Im trying else

def parentIssue = issue.parentObject

String priorityName = parentIssue.getPriority().name

def issueService = ComponentAccessor.issueService

def loggedInUser = ComponentAccessor.jiraAuthenticationContext.loggedInUser

def availablePriorities = ComponentAccessor.constantsManager.priorities

def highPriority = availablePriorities.find { it.name == priorityName }

def issueInputParams = issueService.newIssueInputParameters()

issueInputParams.with {

    priorityId = highPriority.id

}

def updateValidationResult = issueService.validateUpdate(loggedInUser, issue?.id, issueInputParams)

def updateResult = issueService.update(loggedInUser, updateValidationResult, EventDispatchOption.ISSUE_UPDATED, false)

but have error issuetype=Issue type is a sub-task but parent issue key or id not specified.