The test class UrlAssetTestCase has the method mutateURL(final URL mutableURL) which uses reflection to test if the URL can be mutated in a given JRE. It uses the nonexisting method set in URL.class.getDeclaredMethod("set", parameterTypes) to test this which results in the test being always successful even though there was never even an attempt to mutate a URL due to the nonexisting set method.

We should rewrite this to make this test functional.