[FileUtils] copyURLToFile fails with URL to a file in a jar

[Security Management]

I've got the following code:

java.net.URL srcFileURL =
Thread.currentThread().getContextClassLoader().getResource("meaning.unl");
File destFile = new File("tmp.unl");
FileUtils.copyURLToFile(srcFileURL, destFile);

The last line throws an exception.  If I print the file location, it's
correct (meaning.unl) is in the jar file, which is on the classpath.

Any idea why?  Does copyURLToFile not support a file that is inside of a
jar?  Any suggestions?

Thanks,
Mike.