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import java.util.ArrayList;
import java.util.Collection;
import org.joget.apps.app.service.AppUtil;
import org.joget.directory.model.User;
import org.joget.directory.model.service.ExtDirectoryManager;
import org.joget.workflow.model.WorkflowActivity;

public Collection getAssignees(WorkflowActivity activity) { 
    Collection assignees = new ArrayList();
    
    ExtDirectoryManager directoryManager = (ExtDirectoryManager) pluginManager.getBean("directoryManager");
    
    String deptId = "D-005";
    
    //Get total user in department
    Long total = directoryManager.getTotalUsers(null, null, deptId, null, null, null, null);
    
    //Get random number from 0 to the total number of users in department
    int random = (int) (Math.random() * total);
    
    //Get users using directory manager
    Collection userList = directoryManager.getUsers(null, null, deptId, null, null, null, null, "firstName", false, random, 1);
    for(Object u : userList){
        User user = (User) u;
        assignees.add(user.getUsername());
    }
    
    return assignees;
}

//call getAssignees method with injected variable
return getAssignees(workflowActivity);