ClassLoaderUtilsTest fails on Java 9

21:21:24.547 [ERROR] Tests run: 3, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.214 s <<< FAILURE! - in org.apache.flink.runtime.util.ClassLoaderUtilsTest
21:21:24.547 [ERROR] testWithAppClassLoader(org.apache.flink.runtime.util.ClassLoaderUtilsTest)  Time elapsed: 0.021 s  <<< FAILURE!
java.lang.AssertionError
	at org.apache.flink.runtime.util.ClassLoaderUtilsTest.testWithAppClassLoader(ClassLoaderUtilsTest.java:140)

public void testWithAppClassLoader() {
	String result = ClassLoaderUtil.getUserCodeClassLoaderInfo(ClassLoader.getSystemClassLoader());
	assertTrue(result.toLowerCase().contains("system classloader"));