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POWhy does Java Sound behave differently when I run from a .jar?
 

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  1. POWhy does Java Sound behave differently when I run from a .jar?
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    <p>The <code>play</code> method below is from a class which, upon instantiation, reads a .wav file into a byte array called <code>data</code>, and stores the sound format in an <code>AudioFormat</code> object called <code>format</code>.</p> <p>I have a program that calls <code>play</code> from a <code>java.util.Timer</code>. When I go into the folder with all the relevant .class files and I run the program using the command <code>java MainClass</code>, everything works as expected. However, when I put all the .class files in an executable .jar and run the program using the command <code>java -jar MyProgram.jar</code>, sounds played using the <code>play</code> method are cut off after something like 50 to 150 ms.</p> <pre><code>public void play() throws LineUnavailableException { final Clip clip = (Clip)AudioSystem.getLine(new DataLine.Info(Clip.class, format)); clip.open(format, data, 0, data.length); new Thread() { public void run() { clip.start(); try { Thread.sleep(300); // all sounds are less than 300 ms long } catch (InterruptedException ex) { /* i know, i know... */ } clip.close(); } }.start(); } </code></pre> <p>A few comments:</p> <ul> <li><p>I've tried increasing the sleep time in the <code>play</code> method up to 1000 ms, with no change in behavior.</p></li> <li><p>Timing the <code>Thread.sleep</code> using <code>System.nanoTime</code> confirms that the thread is sleeping exactly as long as expected.</p></li> <li><p>Since the sound file to be played is pre-loaded into memory, I don't think the act of extracting the sound resource from the .jar can be causing the problem.</p></li> <li><p>I've tried running the program from both inside and outside the jar using the memory pool size options <code>-Xms2m</code> and <code>-Xmx64m</code> (separately), with no change in behavior.</p></li> </ul> <p>I'm running OpenJDK Java 6 on Ubuntu 11.04. Any idea what's going on?</p>
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    1. USAndrew Thompson
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    1. COFor better help sooner, post an [SSCCE](http://sscce.org/). It is likely the loading of the `byte[]` that is the problem.
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      1. USAndrew Thompson
    2. CO@AndrewThompson: You're totally right! There was a bug in the method that reads the .wav file into the byte array. When I ran the program using java MainClass, the input stream was able to read the .wav file in a single read call, so the bug wasn't apparent. When I ran the program from a .jar, multiple read calls were necessary, and the bug appeared. Thanks so much for your help! If you post your comment as an answer, I'd be glad to accept it.
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    3. CODone! .........
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