--- a/jdk/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/DirArchive.java	Wed Jul 05 22:26:06 2017 +0200
+++ b/jdk/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/DirArchive.java	Mon Nov 07 14:36:27 2016 -0400
@@ -92,7 +92,7 @@
     public DirArchive(Path dirPath, Consumer<String> log) {
         Objects.requireNonNull(dirPath);
         if (!Files.isDirectory(dirPath)) {
-            throw new IllegalArgumentException("Not a directory");
+            throw new IllegalArgumentException(dirPath + " is not a directory");
         }
         chop = dirPath.toString().length() + 1;
         this.moduleName = Objects.requireNonNull(dirPath.getFileName()).toString();

--- a/jdk/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/TaskHelper.java	Wed Jul 05 22:26:06 2017 +0200
+++ b/jdk/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/TaskHelper.java	Mon Nov 07 14:36:27 2016 -0400
@@ -212,7 +212,7 @@
             mainOptions.add(new PlugOption(true, (task, opt, arg) -> {
                 Path path = Paths.get(arg);
                 if (!Files.exists(path) || !Files.isDirectory(path)) {
-                    throw newBadArgs("err.image.must.exist");
+                    throw newBadArgs("err.image.must.exist", path);
                 }
                 existingImage = path.toAbsolutePath();
             }, true, POST_PROCESS));

--- a/jdk/src/jdk.jlink/share/classes/jdk/tools/jlink/resources/jlink.properties	Wed Jul 05 22:26:06 2017 +0200
+++ b/jdk/src/jdk.jlink/share/classes/jdk/tools/jlink/resources/jlink.properties	Mon Nov 07 14:36:27 2016 -0400
@@ -91,7 +91,7 @@
 err.mods.must.be.specified:no modules specified to {0}
 err.path.not.found=path not found: {0}
 err.path.not.valid=invalid path: {0}
-err.image.must.exist=image does not exist or is not a directory
+err.image.must.exist=image {0} does not exist or is not a directory
 err.existing.image.invalid=existing image is not valid
 err.file.not.found=cannot find file: {0}
 err.file.error=cannot access file: {0}