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POJarInputStream: getNextJarEntry always returns null
 

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  1. POJarInputStream: getNextJarEntry always returns null
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    <p>I have an <code>I18n</code> helper class that can find out the available <code>Locale</code>s by looking at the name of the files inside the application's Jar.</p> <pre><code>private static void addLocalesFromJar(List&lt;Locale&gt; locales) throws IOException { ProtectionDomain domain = I18n.class.getProtectionDomain(); CodeSource src = domain.getCodeSource(); URL url = src.getLocation(); JarInputStream jar = new JarInputStream(url.openStream()); while (true) { JarEntry entry = jar.getNextJarEntry(); if (entry == null) { break; } String name = entry.getName(); // ... } } </code></pre> <p>Currently, this isn't working - <code>jar.getNextJarEntry()</code> seems to always return <code>null</code>. I have no idea why that's happening, all I know is that <code>url</code> is set to <code>rsrc:./</code>. I have never seen that protocol, and couldn't find anything about it.</p> <p>Curiously, this works:</p> <pre><code>class Main { public static void main(String[] args) { URL url = Main.class.getProtectionDomain().getCodeSource().getLocation(); JarInputStream jar = new JarInputStream(url.openStream()); while (true) { JarEntry entry = jar.getNextJarEntry(); if (entry == null) { break; } System.out.println(entry.getName()); } } } </code></pre> <p>In this version, even though there is practically no difference between them, the <code>url</code> is correctly set to the path of the Jar file.</p> <p>Why doesn't the first version work, and what is breaking it?</p> <p><strong>UPDATE</strong>:</p> <p>The working example really only works if I don't use Eclipse to export it. It worked just fine in NetBeans, but in the Eclipse version the URL got set to <code>rsrc:./</code> too.</p> <p>Since I exported it with <code>Package required libraries into generated JAR</code> library handling, Eclipse put its <code>jarinjarloader</code> in my Jar so I can have all dependencies inside it. It works fine with the other settings, but is there any way to make this work independently of them?</p> <hr> <h3>Another question</h3> <p>At the moment, that class is part of my application, but I plan to put it in a separate library. In that case, how can I make sure it will work with separate Jars?</p>
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    1. USMatheus Moreira
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    1. COpossible duplicate of [How can I discover resources in a Java jar with a wildcard name?](http://stackoverflow.com/questions/133229/how-can-i-discover-resources-in-a-java-jar-with-a-wildcard-name)
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      1. USbmargulies
    2. COWhat is the url in the version that works?
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      1. USJesse Barnum
    3. COAlso, where is the jar stored for the version that doesn't work? I tried running your example, and I get a file:// URL, which works fine.
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      1. USJesse Barnum
 

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