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POMulti threading with Java Executor
 

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    <p>I am stuck with this following problem. Say, I have a request which has 1000 items, and I would like to utilize Java Executor to resolve this.</p> <p>Here is the main method</p> <pre><code>public static void main(String[] args) { //Assume that I have request object that contain arrayList of names //and VectorList is container for each request result ExecutorService threadExecutor = Executors.newFixedThreadPool(3); Vector&lt;Result&gt; vectorList = new Vector&lt;Result(); for (int i=0;i&lt;request.size();i++) { threadExecutor.execute(new QueryTask(request.get(i).getNames, vectorList) } threadExecutor.shutdown(); response.setResult(vectorList) } </code></pre> <p>And here is the QueryTask class</p> <pre><code>public QueryTask() implements Runnable { private String names; private Vector&lt;Result&gt; vectorList; public QueryTask(String names, Vector&lt;Result&gt; vectorList) { this.names = names; this.vectorList = vectorList; } public void run() { // do something with names, for example, query database Result result = process names; //add result to vectorList vectorList.add(result); } } </code></pre> <p>So, based on the example above, I want to make thread pool for each data I have in the request, run it simultaneously, and add result to VectorList. And at the end of the process, I want to have all the result already in the Vector list.</p> <p>I keep getting inconsistent result in the response. For example, if I pass request with 10 names, I am getting back only 3 or 4, or sometimes nothing in the response. I was expecting if I pass 10, then I will get 10 back.</p> <p>Does anyone know whats causing the problem?</p> <p>Any help will be appreciate it.</p> <p>Thanks</p>
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