How to resolve a ClassCastException error when copying a multiple User Picker?

Jeremy_kbmkh1

We're in the process of a migration and I'm simply trying to use scriptrunner to copy data in a multiple user picker into another multiple user picker.  A snippet of the pertinent code is:

Issues.search("project = ABC and issuetype = story and 'Multiple Assignee' is not empty").each { issue ->
def mAssignee = issue.getCustomFieldValue('Multiple Assignee')
issue.update {
setCustomFieldValue('Collaborators', mAssignee)
}
}

Where both Collaborators and Multiple Assignee are multi user pickers.

I keep getting the error:

Something went wrong: ClassCastException

class java.util.ArrayList cannot be cast to class com.atlassian.jira.user.ApplicationUser (java.util.ArrayList is in module java.base of loader 'bootstrap'; com.atlassian.jira.user.ApplicationUser is in unnamed module of loader org.apache.catalina.loader.ParallelWebappClassLoader @5a12c728)

Ram Kumar Aravindakshan _Adaptavist_

Hi @Jeremy

Your approach is currently not working because when you pass a value to a Custom Field using HAPI, you need to pass it as a String.

In your current approach, you are passing it as a List of Application Users, i.e. List<ApplicationUser> hence it fails to pass the value.

Please refer to this snippet for a working solution. 

Below is the sample working code from the snippet link above:-

import com.adaptavist.hapi.jira.issues.Issues
import com.atlassian.jira.user.ApplicationUser

Issues.search("""project = MOCK and "Multi User Picker"  is not EMPTY""").each {
    def issue = it
def users = issue.getCustomFieldValue('Multi User Picker') as List<ApplicationUser>

    def selectedUsers = users.collect {
        it.username
    }.toString()

    def updated = selectedUsers.replace('[','').replace(']','').trim()

    issue.update {
        setCustomFieldValue('Collaborators', updated)
    }
}

Please note that the sample working code above is not 100% exact to your environment. Hence, you will need to make the required modifications.

Below is a screenshot of the ScriptRunner Console configuration:-

 

Below are a couple of test screenshots for your reference:-

1. Before the code is executed in the ScriptRunner Console, if you notice, the issues below have options from the Multi User Picker field:-

2. Once the code is executed in the ScriptRunner Console, the options from the Multi User Picker field are copied to the Collaborators field as shown in the screenshots below:-

 

I hope this helps to solve your question. :-)

Thank you and Kind regards,

Ram