jdk/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/JlinkTask.java

@@ -151,11 +151,11 @@
 
     private static final OptionsHelper<JlinkTask> optionsHelper
             = taskHelper.newOptionsHelper(JlinkTask.class, recognizedOptions);
     private PrintWriter log;
 
-    void setLog(PrintWriter out) {
+    void setLog(PrintWriter out, PrintWriter err) {
         log = out;
         taskHelper.setLog(log);
     }
 
     /**

@@ -180,11 +180,12 @@
         ByteOrder endian = ByteOrder.nativeOrder();
     }
 
     int run(String[] args) {
         if (log == null) {
-            setLog(new PrintWriter(System.out, true));
+            setLog(new PrintWriter(System.out, true),
+                   new PrintWriter(System.err, true));
         }
         try {
             optionsHelper.handleOptions(this, args);
             if (options.help) {
                 optionsHelper.showHelp(PROGNAME);