script for Counting how many times a bug was reopened throws null pointer exception

[Vidhya Mohan]

Hello,

I've a script placed in 'post function' of 'reopen' transition to increase the counter of 'Reopen Count' field. It works sometimes but other times it throws null pointer exception 

Below is the script

import com.atlassian.jira.issue.CustomFieldManager;
import com.atlassian.jira.issue.fields.CustomField;
import com.atlassian.jira.component.ComponentAccessor;
import com.atlassian.jira.event.type.EventDispatchOption;

def customFieldManager = ComponentAccessor.getCustomFieldManager()
def reopenCountCf = customFieldManager.getCustomFieldObject(18906)
def reopenCount = issue.getCustomFieldValue(reopenCountCf) as Double

reopenCount++

def issueManager = ComponentAccessor.getIssueManager()
def currentUser = ComponentAccessor.getJiraAuthenticationContext().getLoggedInUser()
issue.setCustomFieldValue(reopenCountCf, reopenCount)
issueManager.updateIssue(currentUser, issue, EventDispatchOption.DO_NOT_DISPATCH, false)

The error that I get is 

2021-06-07 14:12:06,115 ERROR [workflow.AbstractScriptWorkflowFunction]: Workflow script has failed on issue E2ET-45536 for user 'xxx'. View here: https://jiraprd-proximuscorp.msappproxy.net/secure/admin/workflows/ViewWorkflowTransition.jspa?workflowMode=live&workflowName=0_e2e_bug_wf&descriptorTab=postfunctions&workflowTransition=331&highlight=1
java.lang.NullPointerException: Cannot invoke method next() on null object
at Script26.run(Script26.groovy:10)

What is wrong with my code? 

[Ravi Sagar _Sparxsys_ · Accepted solution]

Hi @Vidhya Mohan 

Does it fail when there is no value in the custom field? If yes may be you can try to add a check if the custom field value is null (empty) then instead of doing reopenCount++ just try to update the field value with 1.

I hope it works.

Ravi

[Vidhya Mohan]

Hello @Ravi Sagar _Sparxsys_ ,

You are right.. When the value is null it is failing. If the value is 0 or something else, then it is working correct. I'm new to groovy scripting. The script above I got it from atlassian forum. Would it be possible for you to help me with the changes that needs to be made to the script?

Regards,

Vidhya