From 1bb48694f4fe9daff299d5c4a057dcb739b79575 Mon Sep 17 00:00:00 2001
From: Jesse Wilson <jesse@swank.ca>
Date: Fri, 9 Sep 2011 08:10:21 +0000
Subject: [PATCH] Permit the null key, which is written as "null"

---
 .../gson/internal/bind/GsonCompatibleMapTypeAdapter.java    | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gson/src/main/java/com/google/gson/internal/bind/GsonCompatibleMapTypeAdapter.java b/gson/src/main/java/com/google/gson/internal/bind/GsonCompatibleMapTypeAdapter.java
index fd453b75..62e4ca29 100644
--- a/gson/src/main/java/com/google/gson/internal/bind/GsonCompatibleMapTypeAdapter.java
+++ b/gson/src/main/java/com/google/gson/internal/bind/GsonCompatibleMapTypeAdapter.java
@@ -96,7 +96,11 @@ public final class GsonCompatibleMapTypeAdapter<V> extends TypeAdapter<Map<Strin
 
     writer.beginObject();
     for (Map.Entry<String, V> entry : map.entrySet()) {
-      writer.name(entry.getKey());
+      String key = entry.getKey();
+      if (key == null) {
+        key = "null";
+      }
+      writer.name(key);
       valueTypeAdapter.write(writer, entry.getValue());
     }
     writer.endObject();