Best Queue Consumer implementation in Java

Good day!

I want to make an ExecutorService consumers for taking data from queue and working with it on server side. The idea is - I poll queue from time to time and if I see that it is not empty I start ExecutorService with N threads (lets say 5). Then I w8 while queue will be empty and shutdown threads. And all again - poll queue for data.... Is this alg ok? Or may be there are some ready implementations/frameworks for such task?

I found this implementation of ConcurrentQueue cunsumers :

public class ConcurrentQueueClient implements Runnable {

    private Queue<String> concurrentQueue;

    public ConcurrentQueueClient(Queue concurrentQueue) {
        this.concurrentQueue = concurrentQueue;
     }

    public void run() {
         boolean stopCondition = (concurrentQueue.size() == 0);

        while (!stopCondition) {
            for (int i = 0; i < concurrentQueue.size(); i++) {
                System.out.println("Client dequeue item "
                        + concurrentQueue.poll());

            }
            stopCondition = (concurrentQueue.size() == 0);
        }

        System.out.println("Client thread exiting...");
    }
 }

and testing it in such way :

 Queue<String> queue = new ConcurrentLinkedQueue<String>();
 ExecutorService consumers = null;
 while(true) {

if(queue.size() != 0) {
   consumers = Executors.newFixedThreadPool(100);
   for (int i = 0; i < 5; i++) {
        ConcurrentQueueClient client = new ConcurrentQueueClient(queue);
        consumers.execute(client);
   }
}

while (queue.size() != 0) {
       try {
           Thread.sleep(1500);
       } catch (InterruptedException e) {
           e.printStackTrace();
       }

}

 consumers.shutdown();
 try {
     consumers.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS);
 } catch (InterruptedException e) {
     e.printStackTrace();
 }


}