--- a/src/java.base/share/classes/javax/security/auth/login/AppConfigurationEntry.java	Thu Dec 13 16:14:07 2018 +0100
+++ b/src/java.base/share/classes/javax/security/auth/login/AppConfigurationEntry.java	Thu Dec 13 15:31:05 2018 +0100
@@ -75,7 +75,7 @@
                                 LoginModuleControlFlag controlFlag,
                                 Map<String,?> options)
     {
-        if (loginModuleName == null || loginModuleName.length() == 0 ||
+        if (loginModuleName == null || loginModuleName.isEmpty() ||
             (controlFlag != LoginModuleControlFlag.REQUIRED &&
                 controlFlag != LoginModuleControlFlag.REQUISITE &&
                 controlFlag != LoginModuleControlFlag.SUFFICIENT &&