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POThread.sleep() Never Returns
 

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    <p>I am having an odd error with <code>Thread.sleep()</code> on Java. For some reason, when I call sleep on some machines, it never returns. I can't figure out what could be causing this behaviour. At first, I thgouth the error might be elsewhere in my code, so I made the simplest possible sleep test:</p> <pre><code>public class SleepTest { public static void main (String [] args) { System.out.println ("Before sleep..."); try { Thread.sleep (100); } catch (InterruptedException e) { } System.out.println ("After sleep..."); } } </code></pre> <p>On most machines it works, but on several machines which I am remotely logging into, it pauses indefinitely between the print statements. I have waited up to a half an hour with no change in behaviour. The machines that are displaying this error are Linux machines. Here is some information about the machines:</p> <pre><code>$ uname -a Linux zone29ea 2.6.32-220.17.1.el6.x86_64 #1 SMP Tue May 15 17:16:46 CDT 2012 x86_64 x86_64 x86_64 GNU/Linux $ java -version java version "1.6.0_22" OpenJDK Runtime Environment (IcedTea6 1.10.6) (rhel-1.43.1.10.6.el6_2-x86_64) OpenJDK 64-Bit Server VM (build 20.0-b11, mixed mode) </code></pre> <p>What could be causing this behaviour?</p> <p>UPDATE</p> <p>Revised version, which still never ends:</p> <pre><code>public class SleepTest { public static void main (String [] args) { new Thread () { public void run () { System.out.println ("Before sleep..."); try { Thread.sleep (100); } catch (InterruptedException e) { e.printStackTrace (); } System.out.println ("After sleep..."); } }.start(); } } </code></pre>
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    1. COdid you check if there is an error fired inside your catch ? maybe a printStackTrace?
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      1. USAdel Boutros
    2. COcould you try that in a seperate thread to make sure that that still occurs? what you are doing is putting the main thread to sleep which could cause the issue
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      1. USJohn Kane
    3. COAre you sure the problem isn't in the recuperation of the second println (as you do it remotely) ? Maybe a missing flush ? `Thread.sleep(100);` works even on linux.
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      1. USDenys Séguret
 

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