Can't seem to get my class to load using UrlClassLoader

Question

So I made a super-simple file, and shot it up onto my server at:

http://myServer:8080/testApp/

In there is testApp.jar and a folder that acts as bin. I've tried a few things to fix this but I keep getting: Exception in thread "main" java.lang.ClassNotFoundException: com.testApp.Main

The full path to Main.Class is http://myserver:8080/testApp/com/myCom/Main.Class

My code to find this is

    URLClassLoader loader = new URLClassLoader(new URL[]{new File("http://myserver04:8080/testApp/").toURI().toURL()});

    Class<?> mainClass = loader.loadClass("com.myCom.Main");
    Method mainMethod = mainClass.getMethod("main", String[].class);
    mainMethod.invoke(null, new String[]{});
}

My end-goal is simply to run the main method of this file and the file being launched will have a simple "Hello World" swing window.

Thanks

score 0 · Accepted Answer · answered Nov 13 '12 at 05:38

From just glancing at the javadocs of URLClassLoader:

Any URL that ends with a '/' is assumed to refer to a directory. Otherwise, the URL is assumed to refer to a JAR file which will be downloaded and opened as needed.

The URL you're specifying ends with a slash, so the class loader expects to see .class files in that directory. Try specifying the full path to the JAR in the URL

Can't seem to get my class to load using UrlClassLoader

1 Answers1