Getting a null pointer exception for this script - why?

[Maya_Chase]

I have this Scriptrunner script:

import com.atlassian.jira.component.ComponentAccessor
import org.apache.log4j.Category
import com.atlassian.jira.issue.Issue
import com.atlassian.jira.issue.IssueManager
import com.atlassian.jira.issue.MutableIssue
import com.atlassian.jira.user.ApplicationUser
import com.atlassian.jira.component.ComponentAccessor

MutableIssue issue = issue
def watcherManager = ComponentAccessor.getWatcherManager();
def userManager = ComponentAccessor.getUserManager()
def user1 = userManager.getUserByKey('flaurentine')

if (issue.getReporterId() in ['machase' <and a list of other ids>])
{
watcherManager.startWatching(user1, issue)
}

-----------------------------

I get no errors when saving the script, but when I run it I get:

2018-01-04 11:07:00,157 ERROR [workflow.ScriptWorkflowFunction]: *************************************************************************************
2018-01-04 11:07:00,157 ERROR [workflow.ScriptWorkflowFunction]: Script function failed on issue: null, actionId: 1, file: <inline script>
java.lang.NullPointerException
	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:210)
	at com.google.common.cache.LocalCache$LocalManualCache.invalidate(LocalCache.java:4764)
	at com.atlassian.jira.issue.watchers.DefaultWatcherManager.updateWatch(DefaultWatcherManager.java:167)
	at com.atlassian.jira.issue.watchers.DefaultWatcherManager.startWatching(DefaultWatcherManager.java:84)
	at com.atlassian.jira.issue.watchers.DefaultWatcherManager.startWatching(DefaultWatcherManager.java:75)
	at com.atlassian.jira.issue.watchers.WatcherManager$startWatching.call(Unknown Source)
	at Script206.run(Script206.groovy:32)

So apparently it doesn't like my watcherManager statement, but I don't know why? I've checked and user1 is what I expect it to be. By process of elimination I'm misusing "issue" but I don't know how to fix it. Please help. Thank you!

[Alexey Matveev · Accepted solution]

Hello,

Where do you execute the script?

you should log values to your log to be sure that issue and user1 are not null.

log.error(issue)

log.error(user1)

Then have a look at the logs.

[Alexey Matveev]

I mean the variable issue is only available for post-function, validators and conditions.

[Maya_Chase]

Hi Alexey, thank you so much for answering. I put in:

log.debug(user1)
log.debug(issue)

and I get back:

2018-01-04 11:51:31,700 DEBUG [jira.groovy]: flaurentine(flaurentine)
2018-01-04 11:51:31,700 ERROR [jira.groovy]: debug

 The first one is as expected, but I don't know what the other one means? 

[Alexey Matveev]

Where do you execute the script?

try log.debug(issue.key)

I am also not sure what the second line means

[Maya_Chase]

The script is in a post-function on the create transition. 

I took out the startWatching statement but added log.debug(issue.key) and I get this:

2018-01-04 12:18:03,426 DEBUG [jira.groovy]: flaurentine(flaurentine)
2018-01-04 12:18:03,426 DEBUG [jira.groovy]: debug
2018-01-04 12:18:03,428 ERROR [workflow.ScriptWorkflowFunction]: *************************************************************************************
2018-01-04 12:18:03,429 ERROR [workflow.ScriptWorkflowFunction]: Script function failed on issue: null, actionId: 1, file: <inline script>
java.lang.NullPointerException
 at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:210)
 at com.google.common.cache.LocalCache$LocalManualCache.invalidate(LocalCache.java:4764)
 at com.atlassian.jira.issue.watchers.DefaultWatcherManager.updateWatch(DefaultWatcherManager.java:167)
 at com.atlassian.jira.issue.watchers.DefaultWatcherManager.startWatching(DefaultWatcherManager.java:84)
 at com.atlassian.jira.issue.watchers.DefaultWatcherManager.startWatching(DefaultWatcherManager.java:75)
 at com.atlassian.jira.issue.watchers.WatcherManager$startWatching.call(Unknown Source)
 at Script281.run(Script281.groovy:34)

So I'm back to the null pointer exception, so I'm guessing that means issue is null, or at least issue.key is null. How should I be getting issue to mean "this issue that I'm creating"?

[Alexey Matveev]

Your post function must be last in the list

[Maya_Chase]

That was it! Easy peasy fix, thank you!