--- a/src/java.base/share/classes/com/sun/java/util/jar/pack/PackageWriter.java	Fri Dec 07 17:11:17 2018 +0100
+++ b/src/java.base/share/classes/com/sun/java/util/jar/pack/PackageWriter.java	Fri Dec 07 11:51:17 2018 -0500
@@ -646,7 +646,7 @@
             return;  // nothing to write
 
         // The first element must always be the empty string.
-        assert(cpMap[0].stringValue().equals(""));
+        assert(cpMap[0].stringValue().isEmpty());
         final int SUFFIX_SKIP_1 = 1;
         final int PREFIX_SKIP_2 = 2;