List<PrcSubList> listSl = new ArrayList<PrcSubList>();

if (listSl == null || listSl.size() == 0) {
     PrcSubList subListAdd=coreService.addSubListByAddAlert(childSub);

     System.out.println("sublist after insert db :" + subListAdd.getName());

     listSl.add(subListAdd);

     System.out.println(listSl.size() +" sublist after insert list:" + listSl.get(0).getName());

}

Ouput with first System.out.println("sublist after insert db :" + subListAdd.getName());

sublist after insert db :SYSTEM_ALERT_12312313

Problem

But i have NullPointerException with 2nd

System.out.println(listSl.size() +" sublist after insert list:" + listSl.get(0).getName());

Can you help me!