Get username of the users of a group assignees alfresco

[Patrícia Sousa]

I'm trying to get the username of a group of assignees in a workflow creation.

For assignees I made this:

 

    ActivitiScriptNodeList assignees = (ActivitiScriptNodeList) execution.getVariable("bpm_assignees");
            if(assignees == null) {
                System.out.println("No assignees.");
            } else {
                for (ActivitiScriptNode personNode : assignees) {
                    String username = (String) personNode.getProperties().get("cm:userName");
                    listAssignees.add(username);
                    System.out.println("Username: " + username);
                }
            }

But for groups, the ActivitScriptNodeList not works.

How can I do this for bpm_groupAssignees?