--- a/src/java.base/share/classes/sun/nio/fs/AbstractUserDefinedFileAttributeView.java	Thu Dec 13 16:14:07 2018 +0100
+++ b/src/java.base/share/classes/sun/nio/fs/AbstractUserDefinedFileAttributeView.java	Thu Dec 13 15:31:05 2018 +0100
@@ -83,7 +83,7 @@
                 names = list();
                 break;
             } else {
-                if (name.length() == 0)
+                if (name.isEmpty())
                     throw new IllegalArgumentException();
                 names.add(name);
             }