java - executorService.scheduleAtFixedRate to run task forever -


i want task run forever after interval of 1 min. accomplish wrote task in 

public void poll() {     scheduledexecutorservice executorservice= executors.newscheduledthreadpool(1);     scheduledfuture files=executorservice.scheduleatfixedrate(new runnable() {               @override         public void run() {             string path="/desktop/pnl/test";             list<string> filespaths= new arraylist<string>();             file folder= new file(path);             file[] listoffiles= folder.listfiles();             (file file : listoffiles) {                 filespaths.add(file.getabsolutepath());             }             if(!collectionutils.isempty(filespaths)){                 try{                     update(filespaths);                 }                 catch(exception e){                     system.out.println(e.tostring());                 }             }         }     }, 0, 1, timeunit.minutes);     files.cancel(false);     //executorservice.shutdown();  }

but task executes once , not after each minute. don't understand whats wrong here.

while executing code, there nullpointerexception caused @ for (file file : listoffiles) { killed thread.

the following change made run continuously:

if (listoffiles != null) {     (file file : listoffiles) {         filespaths.add(file.getabsolutepath());     } }

moreover, files.cancel(false) ends execution. hence, had comment line. reference of future.cancel()


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