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POHow do I find resources in a .jar on the classpath?
 

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  1. POHow do I find resources in a .jar on the classpath?
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    <p>If I have a collection of resource files in a directory on my classpath, I can enumerate them using <code>ClassLoader.getResources(location)</code>.</p> <p>For example if I have <code>/mydir/myresource.properties</code> on the classpath, I can call the classloader's <code>getResources("mydir")</code> and get an enumeration of URLs containing <code>myresource.properties</code>.</p> <p>When I pack up the exact same resources into a .jar, I don't get anything in the enumeration of URLs when I make the call. I've only replaced the folder structure with a jar containing those folders (it's a webapp, so the jar is going into <code>/WEB-INF/lib</code>). I've also got a number of other calls using <code>getResourceAsStream(location)</code> to get other resources individually by name and they're all working fine.</p> <p>What's different about enumerating resources when the resources are in a .jar?</p> <hr> <p>Update - I've reproduced (ish) the behaviour outside the container. The following snippet results in the <code>dirProperties</code> object having keys set to the resource names in the package, but if the package is in a .jar throws a NullPointerException during the Properties.load(InputStream) method.</p> <pre><code>Properties dirProperties = new Properties(); dirProperties.load(this.getClass().getClassLoader().getResourceAsStream(location)); </code></pre> <p>The same code on the container (Tomcat 5.5) throws no exception but produces an empty Properties object when the files are in a .jar.</p>
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    1. COI've never come across this difference in behaviour before, but I could imagine a situation where a given classloader implementation couldn't express the resource as a URL when it was packed in a JAR. The servers I've worked with (Jboss/Tomcat) *can* do this, however.
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      1. USskaffman
 

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