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PORunning Java program from Python
 

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  1. PORunning Java program from Python
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    <p>I've looked <a href="https://stackoverflow.com/questions/945962/java-problem-running-a-jar-file-in-command-line">here</a>, <a href="https://stackoverflow.com/questions/1940281/cant-run-my-programme-from-command-line">here</a>, <a href="https://stackoverflow.com/questions/250166/noclassdeffounderror-while-trying-to-run-my-jar-with-java-exe-jar-whats-wrong">here</a>, and <a href="https://stackoverflow.com/questions/1279542/how-to-execute-a-java-class-from-the-command-line">here</a>.</p> <p>While informative they just didn't quite have enough for me to discover the root of my problem. My code isn't contained within a JAR file and the customer has requested we do not ship it as such.</p> <p>I built the application in Eclipse and from there it runs fine. I've set up a script that will modify the <code>main</code> method of one of the java files for testing purposes. I want to run the application using a call from Python after I modify it. However, from the command line when I attempt to call the program using <code>java</code> or <code>java -cp .</code> I get the following error:</p> <pre><code>Exception in thread "main" java.lang.NoClassDefFoundError: DemoAPIFunctionality Caused by: java.lang.ClassNotFoundException: DemoAPIFunctionality at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClassInternal(Unknown Source) Could not find the main class: DemoAPIFunctionality. Program will exit. </code></pre> <p>My project depends on several JARs, which are not within the root directory, and a DLL file, again not in the root directory. I'm hoping it's related to the location of one of those but I'm not sure and am making little headway. Here is <code>DemoAPIFunctionality.java</code>:</p> <pre><code>public class DemoAPIFunctionality { public final static void main(String[] args) { DemoAPIFunctionality demo = new DemoAPIFunctionality(); </code></pre> <p>I'd happily list any more information if it will help you help me. (No, I'm not a sports agent.) What do I need to do to get it to work at least from the command line?</p> <p>Thanks in advance.</p>
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    1. COIs `DemoAPIFunctionality` in a package? (If you can show the full source, it would help.) What is your directory and file structure? Where do the `.class` files reside?
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