--- old/src/java.base/share/classes/com/sun/java/util/jar/pack/PackageWriter.java	2018-12-06 17:52:45.725343199 -0500
+++ new/src/java.base/share/classes/com/sun/java/util/jar/pack/PackageWriter.java	2018-12-06 17:52:45.561342386 -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;