diff -r e10a1f7aaa13 -r 8bf9268df0e2 src/java.base/share/classes/sun/security/util/AbstractAlgorithmConstraints.java
--- a/src/java.base/share/classes/sun/security/util/AbstractAlgorithmConstraints.java	Thu Dec 13 16:14:07 2018 +0100
+++ b/src/java.base/share/classes/sun/security/util/AbstractAlgorithmConstraints.java	Thu Dec 13 15:31:05 2018 +0100
@@ -75,7 +75,7 @@
 
     static boolean checkAlgorithm(String[] algorithms, String algorithm,
             AlgorithmDecomposer decomposer) {
-        if (algorithm == null || algorithm.length() == 0) {
+        if (algorithm == null || algorithm.isEmpty()) {
             throw new IllegalArgumentException("No algorithm name specified");
         }