Not able to get userName from custom field which has emailAddress of user using script runner jira

[Bhupesh Nagda]

Hi,

JIRA 7.13.0

Adaptavist ScriptRunner for JIRA 6.3.0

I am trying to get value of username from email address but getUserByEmail is not working and community answers suggested to use getUserByKey. However, i am struggling with this as well, could anyone please point out my mistake?

Please not that this small script is a part of a huge script.

Aim is to get value of display name from email. "owner" custom field is a single line text field which has user email address. Since, we use firstname.lastname for username so I have trimmed @domain.com which gives me user name and i need to generate displayName from username to use it along with username in the API call for confluence page creation from jira script post function

Script ==>

String username //= ComponentAccessor.getJiraAuthenticationContext().getLoggedInUser().name
def fullname
def ownerObj = ComponentAccessor.getCustomFieldManager().getCustomFieldObjectByName("Owner")
String ownerInitial = issue.getCustomFieldValue(ownerObj).toString()
println("Owner Initial is "+ownerInitial) 
if(ownerInitial)
{
String user = ownerInitial
int index = ownerInitial.indexOf('@')
user = user.substring(0,index)
println("value of user is "+user) 
//UserManager userManager = ComponentAccessor.userManager
UserManager userManager = ComponentAccessor.getUserManager()
username = userManager.getUserByKey(user)
println("Username is "+username)
fullname = username.displayName
println("Full name is "+fullname)
}
else
{

username = " "
fullname = " "
}

Logs ==>

Owner Initial is gottfried.mayer@domain.com
value of user is gottfried.mayer
Username is null
2020-08-21 22:25:34,282 https-jsse-nio-8553-exec-19 ERROR admin 1345x31387x1 13lhcsr 10.74.207.19 /secure/WorkflowUIDispatcher.jspa [c.o.s.jira.workflow.AbstractScriptWorkflowFunction] *************************************************************************************
2020-08-21 22:25:34,282 https-jsse-nio-8553-exec-19 ERROR admin 1345x31387x1 13lhcsr 10.74.207.19 /secure/WorkflowUIDispatcher.jspa [c.o.s.jira.workflow.AbstractScriptWorkflowFunction] Script function failed on issue: RMP-5828, actionId: 21, file: <inline script>
java.lang.NullPointerException: Cannot get property 'displayName' on null object
at Script377.run(Script377.groovy:237)

 I would appreciate any guidance:)

Thanks

Bhupesh

[Raynard Rhodes]

I believe ownerInitial should be 

def ownerInitial = issue.getCustomFieldValue(ownerObj) as ApplicationUser

importing https://docs.atlassian.com/software/jira/docs/api/8.5.4/com/atlassian/jira/user/ApplicationUser.html