Groovy Script NPE error when updating multi-user custom field in a post function

[Atlassian Admin [Zynga]]

I have the below script to update a multi-user custom field in a post function.

import com.atlassian.jira.user.ApplicationUsers

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.user.ApplicationUser
import com.atlassian.jira.issue.MutableIssue
import com.atlassian.jira.issue.fields.CustomField
import com.atlassian.jira.issue.IssueManager
import com.atlassian.jira.issue.ModifiedValue
import com.atlassian.jira.issue.util.IssueChangeHolder;
import com.atlassian.jira.issue.fields.layout.field.FieldLayoutItem;
import com.atlassian.jira.issue.util.DefaultIssueChangeHolder;
import com.atlassian.jira.event.type.EventDispatchOption
import com.atlassian.jira.issue.Issue

IssueManager issueManager = ComponentAccessor.getIssueManager();
MutableIssue issue = issueManager.getIssueObject(issue.id);
def subTasks = issue.getSubTaskObjects()
List<ApplicationUser> users;
CustomField multiUser = ComponentAccessor.getCustomFieldManager().getCustomFieldObjectByName("CC List")

subTasks.each {
String assignee1 = it.assigneeId
if(users == null)
users = new ArrayList<>();
users.add(ComponentAccessor.getUserManager().getUserByName(assignee1))
}

issue.setCustomFieldValue(multiUser, users);
issueManager.updateIssue(ComponentAccessor.getJiraAuthenticationContext().getLoggedInUser(), issue, EventDispatchOption.ISSUE_UPDATED, false)

The field gets updated in the issue after adding the last line, but also seeing the below error in the logs.

2019-02-09 13:43:59,780 ERROR [workflow.ScriptWorkflowFunction]: *************************************************************************************
2019-02-09 13:43:59,781 ERROR [workflow.ScriptWorkflowFunction]: Script function failed on issue: FA-635, actionId: 51, file: <inline script>
java.lang.NullPointerException
	at com.atlassian.jira.issue.customfields.impl.MultiUserCFType.getChangelogValue(MultiUserCFType.java:123)
	at com.atlassian.jira.issue.customfields.impl.MultiUserCFType.getChangelogValue(MultiUserCFType.java:80)
	at com.atlassian.jira.issue.fields.ImmutableCustomField.getChangelogValue(ImmutableCustomField.java:376)
	at com.atlassian.jira.issue.fields.ImmutableCustomField.updateValue(ImmutableCustomField.java:411)
	at com.atlassian.jira.issue.fields.ImmutableCustomField.updateValue(ImmutableCustomField.java:396)
	at com.atlassian.jira.issue.managers.DefaultIssueManager.updateFieldValues(DefaultIssueManager.java:704)
	at com.atlassian.jira.issue.managers.DefaultIssueManager.updateIssue(DefaultIssueManager.java:669)
	at com.atlassian.jira.issue.managers.DefaultIssueManager.updateIssue(DefaultIssueManager.java:655)
	at com.atlassian.jira.issue.managers.RequestCachingIssueManager.updateIssue(RequestCachingIssueManager.java:214)
	at com.atlassian.jira.issue.IssueManager$updateIssue$2.call(Unknown Source)
	at Script350.run(Script350.groovy:32)

Could someone help resolve the issue?

[Mohamed Benziane · Accepted solution]

Hi,

Make sure your mapping is good, and try to put this code only in the initialiser.

[BYA]

Thanks is working !!!!!!