CallableExample.java

public class CallableExample {

    public static void main(String[] args) {

        ExecutorService executor = Executors.newFixedThreadPool(10);

        List<Future<String>> list = new ArrayList<>();

        Callable<String> callable = new HelloCallable();

        for(int i=0; i< 100; i++){
            Future<String> future = executor.submit(callable);
            list.add(future);
        }

        for(Future<String> fut : list){
            try {
                System.out.println(fut.get());
            } catch (InterruptedException | ExecutionException e) {
                System.out.println("Exception thrown: "+e.getMessage());
            }
        }

        executor.shutdown();
    }
}

class HelloCallable implements Callable<String> {

    @Override
    public String call() throws Exception {
        LocalDateTime now =  LocalDateTime.now();
        long nanos = now.toInstant(OffsetDateTime.now().getOffset())
                .toEpochMilli();
        if(nanos % 2 == 0){
            throw new Exception("even time: "+nanos);
        }
        return LocalDateTime.now().toString();
    }
}