--- a/jdk/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/plugins/DefaultCompressPlugin.java	Thu Apr 28 08:26:38 2016 -0700
+++ b/jdk/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/plugins/DefaultCompressPlugin.java	Tue May 03 09:09:57 2016 +0100
@@ -125,7 +125,7 @@
                         zip = new ZipPlugin(resFilter);
                         break;
                     default:
-                        throw new PluginException("Invalid level " + level);
+                        throw new IllegalArgumentException("Invalid compression level " + level);
                 }
             } else {
                 ss = new StringSharingPlugin(resFilter);