Program: 69681
Project: 69681
Buggy source:
protected void init(UserRequest ureq,boolean mayModifyMembers,boolean keepAtLeastOne,boolean enableTablePreferences,boolean enableUserSelection,boolean allowDownload,boolean mandatoryEmail,Group group,String role){
  this.group=group;
  this.mayModifyMembers=mayModifyMembers;
  this.keepAtLeastOne=keepAtLeastOne;
  this.mandatoryEmail=mandatoryEmail;
  securityManager=BaseSecurityManager.getInstance();
  imModule=CoreSpringFactory.getImpl(InstantMessagingModule.class);
  imService=CoreSpringFactory.getImpl(InstantMessagingService.class);
  userManager=CoreSpringFactory.getImpl(UserManager.class);
  sessionManager=CoreSpringFactory.getImpl(UserSessionManager.class);
  mailManager=CoreSpringFactory.getImpl(MailManager.class);
  Roles roles=ureq.getUserSession().getRoles();
  BaseSecurityModule securityModule=CoreSpringFactory.getImpl(BaseSecurityModule.class);
  isAdministrativeUser=securityModule.isUserAllowedAdminProps(roles);
  chatEnabled=imModule.isEnabled() && imModule.isPrivateEnabled();
  this.addUserMailDefaultTempl=null;
  this.removeUserMailDefaultTempl=null;
  groupmemberview=createVelocityContainer("String_Node_Str");
  addUsersButton=LinkFactory.createButtonSmall("String_Node_Str",groupmemberview,this);
  addUsersButton.setElementCssClass("String_Node_Str");
  addUserButton=LinkFactory.createButtonSmall("String_Node_Str",groupmemberview,this);
  addUserButton.setElementCssClass("String_Node_Str");
  if (mayModifyMembers) {
    groupmemberview.contextPut("String_Node_Str",Boolean.TRUE);
  }
  TableGuiConfiguration tableConfig=new TableGuiConfiguration();
  tableConfig.setDownloadOffered(allowDownload);
  if (enableTablePreferences) {
    if (mayModifyMembers) {
      tableConfig.setPreferencesOffered(true,"String_Node_Str" + group.getKey());
    }
 else {
      tableConfig.setPreferencesOffered(true,"String_Node_Str" + group.getKey());
    }
  }
  myTrans=userManager.getPropertyHandlerTranslator(getTranslator());
  tableCtr=new TableController(tableConfig,ureq,getWindowControl(),myTrans);
  listenTo(tableCtr);
  initGroupTable(tableCtr,ureq,enableTablePreferences,enableUserSelection);
  reloadData();
  groupmemberview.put("String_Node_Str",tableCtr.getInitialComponent());
  putInitialPanel(groupmemberview);
}

Fixed version (ground truth):
protected void init(UserRequest ureq,boolean mayModifyMembers,boolean keepAtLeastOne,boolean enableTablePreferences,boolean enableUserSelection,boolean allowDownload,boolean mandatoryEmail,Group group,String role){
  this.group=group;
  this.mayModifyMembers=mayModifyMembers;
  this.keepAtLeastOne=keepAtLeastOne;
  this.mandatoryEmail=mandatoryEmail;
  setTranslator(Util.createPackageTranslator(org.olat.admin.securitygroup.gui.GroupController.class,getLocale(),getTranslator()));
  Roles roles=ureq.getUserSession().getRoles();
  BaseSecurityModule securityModule=CoreSpringFactory.getImpl(BaseSecurityModule.class);
  isAdministrativeUser=securityModule.isUserAllowedAdminProps(roles);
  chatEnabled=imModule.isEnabled() && imModule.isPrivateEnabled();
  this.addUserMailDefaultTempl=null;
  this.removeUserMailDefaultTempl=null;
  groupmemberview=createVelocityContainer("String_Node_Str");
  addUsersButton=LinkFactory.createButtonSmall("String_Node_Str",groupmemberview,this);
  addUsersButton.setElementCssClass("String_Node_Str");
  addUserButton=LinkFactory.createButtonSmall("String_Node_Str",groupmemberview,this);
  addUserButton.setElementCssClass("String_Node_Str");
  if (mayModifyMembers) {
    groupmemberview.contextPut("String_Node_Str",Boolean.TRUE);
  }
  TableGuiConfiguration tableConfig=new TableGuiConfiguration();
  tableConfig.setDownloadOffered(allowDownload);
  if (enableTablePreferences) {
    if (mayModifyMembers) {
      tableConfig.setPreferencesOffered(true,"String_Node_Str" + group.getKey());
    }
 else {
      tableConfig.setPreferencesOffered(true,"String_Node_Str" + group.getKey());
    }
  }
  myTrans=userManager.getPropertyHandlerTranslator(getTranslator());
  tableCtr=new TableController(tableConfig,ureq,getWindowControl(),myTrans);
  listenTo(tableCtr);
  initGroupTable(tableCtr,ureq,enableTablePreferences,enableUserSelection);
  reloadData();
  groupmemberview.put("String_Node_Str",tableCtr.getInitialComponent());
  putInitialPanel(groupmemberview);
}