--- old/src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties	2020-08-04 13:26:21.237000000 -0700
+++ new/src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties	2020-08-04 13:26:20.541000000 -0700
@@ -1760,6 +1760,10 @@
 compiler.warn.dir.path.element.not.directory=\
     bad path element "{0}": not a directory
 
+# 0: symbol, 1: symbol, 2: symbol
+compiler.warn.missing-declared-ctor=\
+    class {0} in exported package {1} of module {2} does not declare any explicit constructors, exposing a default constructor to clients
+
 compiler.warn.finally.cannot.complete=\
     finally clause cannot complete normally