Re: Code to reproduce threading bug

> This quick and dirty hack demonstrates the threading bug in  
> Namespace.java that I posted earlier today. If I run this several  
> times, it eventually hangs forever.
>
> By adding the synchronized keyword to the  
> Namespace.getNamespace(...) method, the program seems to always work.
>
>
>
> import org.jdom.Namespace;
>
> import java.util.concurrent.CountDownLatch;
> import java.util.concurrent.ExecutorService;
> import java.util.concurrent.Executors;
>
> public class JdomThreadBug {
>
>     public static void main(String[] args) throws  
> InterruptedException {
>         ExecutorService es = Executors.newCachedThreadPool();
>
>         int numThreads = 100;
>         CountDownLatch startLatch = new CountDownLatch(1);
>         for (int i = 0; i < numThreads; i++) {
>             es.submit(new Namespacer(i * 10, i * 10 + 10,  
> startLatch));
>         }
>
>         startLatch.countDown();
>         System.out.println("*** DONE ***");
>         es.shutdown();
>     }
>
>     private static class Namespacer implements Runnable {
>         private final int min;
>         private final int max;
>         private final CountDownLatch startLatch;
>
>         private Namespacer(int min, int max, CountDownLatch  
> startLatch) {
>             this.min = min;
>             this.max = max;
>             this.startLatch = startLatch;
>         }
>
>         public void run() {
>             try {
>                 startLatch.await();
>                 for (int i = min; i < max; i++) {
>                     String prefix = "p" + i;
>                     String uri = "u" + i;
>                     System.out.println("Getting namespace " + prefix  
> + ":" + uri);
>                     Namespace.getNamespace(prefix, uri);
>                     System.out.println("Got namespace " + prefix +  
> ":" + uri);
>                 }
>             } catch (InterruptedException e) {
>                 Thread.currentThread().interrupt();
>             }
>         }
>     }
> }
>
>
> --
> Eric M. Burke
> http://www.linkedin.com/in/ericburke
> 314-494-3185 (mobile)
> 636-272-3298 (home)
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