import com.atlassian.jira.user.ApplicationUser;
import com.atlassian.jira.component.ComponentAccessor;
ApplicationUser currUser = ComponentAccessor.getJiraAuthenticationContext().getLoggedInUser();
getFieldByName("负责人").setFormValue(currUser.getUsername());//单人
getFieldByName("参与人").setFormValue([currUser.getUsername()]);//多人
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