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POHow to use invokeAll() to let all thread pool do their task?
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  1. POHow to use invokeAll() to let all thread pool do their task?
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    copied!<pre><code> ExecutorService pool=Executors.newFixedThreadPool(7); List&lt;Future&lt;Hotel&gt;&gt; future=new ArrayList&lt;Future&lt;Hotel&gt;&gt;(); List&lt;Callable&lt;Hotel&gt;&gt; callList = new ArrayList&lt;Callable&lt;Hotel&gt;&gt;(); for(int i=0;i&lt;=diff;i++){ String str="2013-"+(liDates.get(i).get(Calendar.MONTH)+1)+"-"+liDates.get(i).get(Calendar.DATE); callList.add(new HotelCheapestFare(str)); } future=pool.invokeAll(callList); for(int i=0;i&lt;=future.size();i++){ System.out.println("name is:"+future.get(i).get().getName()); } </code></pre> <p>Now I want pool to <code>invokeAll</code> all the task before getting to the for loop but when I run this program for loop gets executed before that <code>invokeAll</code> and throws this exception:</p> <pre><code>java.util.concurrent.ExecutionException: java.lang.NullPointerException at java.util.concurrent.FutureTask$Sync.innerGet(Unknown Source) at java.util.concurrent.FutureTask.get(Unknown Source) at com.mmt.freedom.cheapestfare.TestHotel.main(TestHotel.java:6‌​5) Caused by: java.lang.NullPointerException at com.mmt.freedom.cheapestfare.HotelCheapestFare.getHotelCheap‌estFare(HotelCheapes‌​tFare.java:166) at com.mmt.freedom.cheapestfare.HotelCheapestFare.call(HotelChe‌​apestFare.java:219) at com.mmt.freedom.cheapestfare.HotelCheapestFare.call(HotelChe‌​apestFare.java:1) at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) atjava.util.concurrent.ThreadPoolExecutor$Worker.run(Unknow‌​n Source) at java.lang.Thread.run </code></pre>
 

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