Get users list from selected group

[Raam S]

I wanted to get the users list from selected group. for an example: Group A have users A,B,C. I wanted to update the users names in the custom field.\

The below code was working fine in jira 6.3.10 and its not working with our latest update jira 7.2.12 and adptavist script runner 5.2.2.

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.Issue
import com.atlassian.jira.issue.fields.CustomField
import com.atlassian.jira.issue.CustomFieldManager
import com.atlassian.crowd.embedded.api.User
import com.atlassian.crowd.embedded.api.Group;

Issue issue = issue;
CustomFieldManager customFieldManager = ComponentAccessor.getCustomFieldManager();
def groupManager = ComponentAccessor.getGroupManager()
def userName = ""

CustomField releasersName = customFieldManager.getCustomFieldObjectByName( "Releasers Name" );
CustomField releaser = customFieldManager.getCustomFieldObjectByName( "Releaser" );

def userManager = ComponentAccessor.getUserManager()

def cfgvalue =(List<Group>) issue.getCustomFieldValue(releaser);

for(Group group:cfgvalue){
Collection <User> usersInGroup = groupManager.getUsersInGroup(group)
for (User user : usersInGroup){
log.warn(user.getDisplayName())
if(userName == "") {
userName = user.getDisplayName()
} else {
userName = userName + "," +user.getDisplayName()
}
}
}

releasersName.updateValue(null, issue, new ModifiedValue(issue.getCustomFieldValue(releasersName), userName),changeHolder);

Please advise