Setting CLASSPATH during runtime

How do I set开发者_StackOverflow a CLASSPATH variable during runtime while using IKVM?

I've been trying to do it by using: java.lang.System.setProperty("java.class.path", "whatever");

The class I'm calling requires a configuration file in the classpath to work - and I keep getting errors that seem to indicate that it hasn't gotten its settings.

Is the way I'm trying to add variable incorrect?

If you really can't set the classpath beforehand yourself using the java's -cp or -classpath argument (why not by the way? that's the normal approach), then you can try to use URLClassLoader instead. Here's a kickoff example:

URL url = new URL(whateverPath);
ClassLoader contextCL = Thread.currentThread().getContextClassLoader();
ClassLoader urlCL = URLClassLoader.newInstance(new URL[] { url }, contextCL);
Thread.currentThread().setContextClassLoader(urlCL);
// ...

You only need to be lucky if the class you're calling is actually loading its resources through Thread.currentThread().getContextClassLoader().getResource() and thus not through SomeClass.class.getClassLoader().getResource().

I was trying to do the same thing. I had some jar files compiled to a .Net dll but some of those (3rd party) jar files were trying to load their configuration files from the java classpath.

I solved the problem by specifying the -classloader option for the ikvmc tool. Example:

ikvmc -out:mydotnetapp.dll -classloader:ikvm.runtime.ClassPathAssemblyClassLoader c:/myjavaapp/lib/*.jar

This worked for me!

Source for the solution: http://old.nabble.com/Not-able-to-load-files-from-ClassPath-td31141788.html