private static URL toURL(String classPathEntry) {
		try {
			return new File(classPathEntry).toURI().toURL();
		} catch (MalformedURLException ex) {
			throw new IllegalArgumentException(
				"URL could not be created from '" + classPathEntry + "'", ex);
		}
	}
Construct the patch classPath from current classLoader.

@param logger logger
@return classpath optimized for grinder.
ngrinder-core/src/main/java/net/grinder/util/AbstractGrinderClassPathProcessor.java