--- a/src/java.base/share/classes/java/security/Policy.java	Thu Dec 13 16:14:07 2018 +0100
+++ b/src/java.base/share/classes/java/security/Policy.java	Thu Dec 13 15:31:05 2018 +0100
@@ -456,7 +456,7 @@
                 throws NoSuchProviderException, NoSuchAlgorithmException {
 
         Objects.requireNonNull(type, "null type name");
-        if (provider == null || provider.length() == 0) {
+        if (provider == null || provider.isEmpty()) {
             throw new IllegalArgumentException("missing provider");
         }