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POJava Library and Class Path Problems
 

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  1. POJava Library and Class Path Problems
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    <p>Quick personal background: I was hired a few months ago as the sole .NET developer (C#) by a company whose other devs are all php devs. A week into the job I was told they wanted to switch to Java instead of doing .NET. Not an ideal situation, but I'm trying to make it work.</p> <p>I don't think I understand the relation between a project's library and the class path. I am using NetBeans 6.7.1 for development. My current project is to create an application that will update multiple merchant sources (eBay, Amazon, etc). I created a Class Library project that handles scheduling of these updates. We'll call it Update. </p> <p>I am in the process of creating Class Library projects for the various sources (e.g. eBay). I added the ebay project to the Update project as a Library. In the IDE there is a box that says "Build Projects on Classpath" which is checked. </p> <p>Finally, right now I have a little console app that has the Update project referenced as a Library (so the ebay project is now 2 libraries deep) in the same manner. It works with code in the Update project.</p> <p>This works OK until I get to instantiating a class (from the Update project via the console app) that is in the ebay project. At that point I get a </p> <pre><code>Exception in thread "main" java.lang.NoClassDefFoundError </code></pre> <p>which is </p> <pre><code> Caused by: java.lang.ClassNotFoundException at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) </code></pre> <p>These projects all build fine but this runtime exception is killing me. I don't know if I really understand what adding a Library to a project does and if there is something more I need to do to make the class accessible. I'm used to being able to add a reference to a DLL and being good to go. I don't understand why I don't get any compiler errors or build errors but I get run time errors about accessibility. I'm guessing the classpath is a missing piece that I don't understand too well, although I suppose it's possible this problem has to do with something else entirely.</p>
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