--- a/langtools/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/Configuration.java	Tue Oct 11 00:28:49 2016 +0900
+++ b/langtools/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/Configuration.java	Mon Oct 10 06:47:47 2016 -0700
@@ -281,6 +281,8 @@
 
     private String pkglistUrlForLinkOffline;
 
+    public boolean dumpOnError = false;
+
     private List<GroupContainer> groups;
 
     public abstract Messages getMessages();
@@ -616,6 +618,13 @@
                     showversion = true;
                     return true;
                 }
+            },
+            new Hidden(resources, "--dump-on-error") {
+                @Override
+                public boolean process(String opt, ListIterator<String> args) {
+                    dumpOnError = true;
+                    return true;
+                }
             }
         };
         Set<Doclet.Option> set = new TreeSet<>();