How can we retrieve transition Id from transition name?

[SWAPNIL SRIVASTAV]

Happy New Year to everyone :)

Could any one please guide me how to retrieve transition Id from transition name?
I want to transition a linked issue through groovy script from custom script post function:
Here is the current rough script:

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.workflow.TransitionOptions
import com.atlassian.jira.issue.IssueInputParameters
import com.atlassian.jira.workflow.IssueWorkflowManager
import com.opensymphony.workflow.loader.ActionDescriptor
import com.atlassian.jira.workflow.edit.layout.display.TransitionOption
import com.atlassian.jira.user.ApplicationUser
import com.atlassian.jira.issue.Issue
import static P3_Constants.Status
import static P3_Constants.Transition

def issueLinkManager = ComponentAccessor.issueLinkManager
def issueManager = ComponentAccessor.issueManager
ApplicationUser loggedInUser = ComponentAccessor.getJiraAuthenticationContext().getLoggedInUser()
def issueService = ComponentAccessor.issueService
IssueWorkflowManager issueWorkflowManager
IssueInputParameters issueInputParameters = issueService.newIssueInputParameters()

def movedIssues = issueLinkManager.getOutwardLinks(issue.id)

def movedIssueObjects = movedIssues.findAll {
it.issueLinkType.name == 'ABC'
}.collect {
issueManager.getIssueObject(it.destinationId)
}

//def transitionOptions = new TransitionOptions.Builder().skipConditions().skipPermissions().skipValidators().build()
TransitionOptions.Builder transitionOptionsBuilder = new TransitionOptions.Builder()
transitionOptionsBuilder.skipConditions().skipPermissions().skipValidators()
TransitionOptions transitionOptions = transitionOptionsBuilder.build ()

movedIssueObjects.each {
def outerIssue = issueManager.getIssueObject(it.toString())
log.error "outerIssue---"+outerIssue
def linkedIssue = outerIssue as Issue
log.error "linkedIssue--"+linkedIssue
if (outerIssue.status.getName() != Status.CLOSED.name) {

log.error "Transition.DISCARD.name---"+Transition.DISCARD.name
log.error "transitionOptions---"+transitionOptions

ActionDescriptor issueTransition = issueWorkflowManager.getAvailableActions(linkedIssue, transitionOptions, loggedInUser).find {it.name == Transition.DISCARD.name}
log.error "issueTransition.id--"+issueTransition.id
assert issueTransition != null : "Workflow Action ${Transition.DISCARD.name} not found"

issueInputParameters.setResolutionId("10015")
def transitionValidationResult = issueService.validateTransition(loggedInUser, outerIssue.id, issueTransition.id, issueInputParameters, transitionOptions)
if (transitionValidationResult.valid) {
def transitionResult = issueService.transition(loggedInUser, transitionValidationResult)
if (transitionResult.valid)
log.debug "Transitioned issue ${outerIssue} through action ${issueTransition.id}"
else
log.debug 'Transition result is not valid'
}
else
log.debug 'The transitionValidation is not valid'
}
}

Problem: It always gives a NullPointerException for method getAvailableActions()

Below are the logs:

2022-01-05 16:33:30,073 ERROR [runner.ScriptBindingsManager]: outerIssue---XYZ-362
2022-01-05 16:33:30,074 ERROR [runner.ScriptBindingsManager]: linkedIssue--XYZ-362
2022-01-05 16:33:30,074 ERROR [runner.ScriptBindingsManager]: Transition.DISCARD.name---Discard
2022-01-05 16:33:30,075 ERROR [runner.ScriptBindingsManager]: transitionOptions---com.atlassian.jira.workflow.TransitionOptions@310b87eb
2022-01-05 16:33:30,080 ERROR [workflow.AbstractScriptWorkflowFunction]: Workflow script has failed on issue BUS-3784 for user 'swapnil'. View here: http://localhost:8080/secure/admin/workflows/ViewWorkflowTransition.jspa?workflowMode=live&workflowName=Workflow+for+Project+BUS&descriptorTab=postfunctions&workflowTransition=1&highlight=4
java.lang.NullPointerException: Cannot invoke method getAvailableActions() on null object
	at P3.Script486$_run_closure3.doCall(Script486.groovy:43)
	at P3.Script486.run(Script486.groovy:33)

[John Funk]

Hi Swapnil - you can get the transition ID by clicking on the Text link while on the workflow. 

[Pramodh M]

Hi @SWAPNIL SRIVASTAV 

Use the below API to get the transition 

You need the Issue key as an input parameter to get the transitions associated with that issue and by filtering the Issue transition name you can get the ID

https://docs.atlassian.com/software/jira/docs/api/REST/7.6.1/#api/2/issue-getTransitions

Thanks,
Pramodh