A DESCRIPTION OF THE REQUEST :
Java doesn't support UserDefinedFileAttributeView.class on Mac OS X. Thus Files.getFileAttributeView(VALID_PATH, UserDefinedFileAttributeView.class) always return null. See OpenJDK issue:

https://bugs.openjdk.java.net/browse/JDK-8030048

JUSTIFICATION :
Parity with Linux and Windows


---------- BEGIN SOURCE ----------
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.attribute.UserDefinedFileAttributeView;

public class ExtFileAttributeChecker {
    public static void main(String[] args) throws IOException {
        System.out.println(Files.getFileStore(Paths.get( " ./ " )).supportsFileAttributeView(UserDefinedFileAttributeView.class));
    }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
https://github.com/IsNull/xattrj