How can I display the user name in the Message Custom field from the JIRA toolkit plugin?

[Assia Alexandrova]

Is there a variable I can use to show the person who created the issue this field is in?

[Vasiliy Zverev]

You can get display name of issue creator like this:

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.Issue
Issue issue = ComponentAccessor.getIssueManager().getIssueObject("ZV2-1");
return issue.getCreator().getDisplayName()

[Vasiliy Zverev]

This is a script for ScriptRunner