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diff --git a/gson/src/test/java/com/google/gson/functional/CustomTypeAdaptersTest.java b/gson/src/test/java/com/google/gson/functional/CustomTypeAdaptersTest.java
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+/*
+ * Copyright (C) 2008 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.gson.functional;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.InstanceCreator;
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonPrimitive;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+import com.google.gson.common.TestTypes.BagOfPrimitives;
+import com.google.gson.common.TestTypes.ClassWithCustomTypeConverter;
+import com.google.gson.reflect.TypeToken;
+
+import java.util.Date;
+import junit.framework.TestCase;
+
+import java.lang.reflect.Type;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Functional tests for the support of custom serializer and deserializers.
+ *
+ * @author Inderjeet Singh
+ * @author Joel Leitch
+ */
+public class CustomTypeAdaptersTest extends TestCase {
+  private GsonBuilder builder;
+
+  @Override
+  protected void setUp() throws Exception {
+    super.setUp();
+    builder = new GsonBuilder();
+  }
+
+  public void testCustomSerializers() {
+    Gson gson = builder.registerTypeAdapter(
+        ClassWithCustomTypeConverter.class, new JsonSerializer<ClassWithCustomTypeConverter>() {
+      public JsonElement serialize(ClassWithCustomTypeConverter src, Type typeOfSrc,
+          JsonSerializationContext context) {
+        JsonObject json = new JsonObject();
+        json.addProperty("bag", 5);
+        json.addProperty("value", 25);
+        return json;
+      }
+    }).create();
+    ClassWithCustomTypeConverter target = new ClassWithCustomTypeConverter();
+    assertEquals("{\"bag\":5,\"value\":25}", gson.toJson(target));
+  }
+
+  public void testCustomDeserializers() {
+    Gson gson = new GsonBuilder().registerTypeAdapter(
+        ClassWithCustomTypeConverter.class, new JsonDeserializer<ClassWithCustomTypeConverter>() {
+      public ClassWithCustomTypeConverter deserialize(JsonElement json, Type typeOfT,
+          JsonDeserializationContext context) {
+        JsonObject jsonObject = json.getAsJsonObject();
+        int value = jsonObject.get("bag").getAsInt();
+        return new ClassWithCustomTypeConverter(new BagOfPrimitives(value,
+            value, false, ""), value);
+      }
+    }).create();
+    String json = "{\"bag\":5,\"value\":25}";
+    ClassWithCustomTypeConverter target = gson.fromJson(json, ClassWithCustomTypeConverter.class);
+    assertEquals(5, target.getBag().getIntValue());
+  }
+
+  public void disable_testCustomSerializersOfSelf() {
+    Gson gson = createGsonObjectWithFooTypeAdapter();
+    Gson basicGson = new Gson();
+    Foo newFooObject = new Foo(1, 2L);
+    String jsonFromCustomSerializer = gson.toJson(newFooObject);
+    String jsonFromGson = basicGson.toJson(newFooObject);
+
+    assertEquals(jsonFromGson, jsonFromCustomSerializer);
+  }
+
+  public void disable_testCustomDeserializersOfSelf() {
+    Gson gson = createGsonObjectWithFooTypeAdapter();
+    Gson basicGson = new Gson();
+    Foo expectedFoo = new Foo(1, 2L);
+    String json = basicGson.toJson(expectedFoo);
+    Foo newFooObject = gson.fromJson(json, Foo.class);
+
+    assertEquals(expectedFoo.key, newFooObject.key);
+    assertEquals(expectedFoo.value, newFooObject.value);
+  }
+
+  public void testCustomNestedSerializers() {
+    Gson gson = new GsonBuilder().registerTypeAdapter(
+        BagOfPrimitives.class, new JsonSerializer<BagOfPrimitives>() {
+      public JsonElement serialize(BagOfPrimitives src, Type typeOfSrc,
+          JsonSerializationContext context) {
+        return new JsonPrimitive(6);
+      }
+    }).create();
+    ClassWithCustomTypeConverter target = new ClassWithCustomTypeConverter();
+    assertEquals("{\"bag\":6,\"value\":10}", gson.toJson(target));
+  }
+
+  public void testCustomNestedDeserializers() {
+    Gson gson = new GsonBuilder().registerTypeAdapter(
+        BagOfPrimitives.class, new JsonDeserializer<BagOfPrimitives>() {
+      public BagOfPrimitives deserialize(JsonElement json, Type typeOfT,
+          JsonDeserializationContext context) throws JsonParseException {
+        int value = json.getAsInt();
+        return new BagOfPrimitives(value, value, false, "");
+      }
+    }).create();
+    String json = "{\"bag\":7,\"value\":25}";
+    ClassWithCustomTypeConverter target = gson.fromJson(json, ClassWithCustomTypeConverter.class);
+    assertEquals(7, target.getBag().getIntValue());
+  }
+
+  public void testCustomTypeAdapterDoesNotAppliesToSubClasses() {
+    Gson gson = new GsonBuilder().registerTypeAdapter(Base.class, new JsonSerializer<Base> () {
+      public JsonElement serialize(Base src, Type typeOfSrc, JsonSerializationContext context) {
+        JsonObject json = new JsonObject();
+        json.addProperty("value", src.baseValue);
+        return json;
+      }
+    }).create();
+    Base b = new Base();
+    String json = gson.toJson(b);
+    assertTrue(json.contains("value"));
+    b = new Derived();
+    json = gson.toJson(b);
+    assertTrue(json.contains("derivedValue"));
+  }
+
+  public void testCustomTypeAdapterAppliesToSubClassesSerializedAsBaseClass() {
+    Gson gson = new GsonBuilder().registerTypeAdapter(Base.class, new JsonSerializer<Base> () {
+      public JsonElement serialize(Base src, Type typeOfSrc, JsonSerializationContext context) {
+        JsonObject json = new JsonObject();
+        json.addProperty("value", src.baseValue);
+        return json;
+      }
+    }).create();
+    Base b = new Base();
+    String json = gson.toJson(b);
+    assertTrue(json.contains("value"));
+    b = new Derived();
+    json = gson.toJson(b, Base.class);
+    assertTrue(json.contains("value"));
+    assertFalse(json.contains("derivedValue"));
+  }
+
+  private static class Base {
+    int baseValue = 2;
+  }
+
+  private static class Derived extends Base {
+    @SuppressWarnings("unused")
+    int derivedValue = 3;
+  }
+
+
+  private Gson createGsonObjectWithFooTypeAdapter() {
+    return new GsonBuilder().registerTypeAdapter(Foo.class, new FooTypeAdapter()).create();
+  }
+
+  public static class Foo {
+    private final int key;
+    private final long value;
+
+    public Foo() {
+      this(0, 0L);
+    }
+
+    public Foo(int key, long value) {
+      this.key = key;
+      this.value = value;
+    }
+  }
+
+  public static class FooTypeAdapter implements JsonSerializer<Foo>, JsonDeserializer<Foo> {
+    public Foo deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
+        throws JsonParseException {
+      return context.deserialize(json, typeOfT);
+    }
+
+    public JsonElement serialize(Foo src, Type typeOfSrc, JsonSerializationContext context) {
+      return context.serialize(src, typeOfSrc);
+    }
+  }
+
+  public void testCustomSerializerInvokedForPrimitives() {
+    Gson gson = new GsonBuilder()
+        .registerTypeAdapter(boolean.class, new JsonSerializer<Boolean>() {
+          public JsonElement serialize(Boolean s, Type t, JsonSerializationContext c) {
+            return new JsonPrimitive(s ? 1 : 0);
+          }
+        })
+        .create();
+    assertEquals("1", gson.toJson(true, boolean.class));
+    assertEquals("true", gson.toJson(true, Boolean.class));
+  }
+
+  @SuppressWarnings("rawtypes")
+  public void testCustomDeserializerInvokedForPrimitives() {
+    Gson gson = new GsonBuilder()
+        .registerTypeAdapter(boolean.class, new JsonDeserializer() {
+          public Object deserialize(JsonElement json, Type t, JsonDeserializationContext context) {
+            return json.getAsInt() != 0;
+          }
+        })
+        .create();
+    assertEquals(Boolean.TRUE, gson.fromJson("1", boolean.class));
+    assertEquals(Boolean.TRUE, gson.fromJson("true", Boolean.class));
+  }
+
+  public void testCustomByteArraySerializer() {
+    Gson gson = new GsonBuilder().registerTypeAdapter(byte[].class, new JsonSerializer<byte[]>() {
+      public JsonElement serialize(byte[] src, Type typeOfSrc, JsonSerializationContext context) {
+        StringBuilder sb = new StringBuilder(src.length);
+        for (byte b : src) {
+          sb.append(b);
+        }
+        return new JsonPrimitive(sb.toString());
+      }
+    }).create();
+    byte[] data = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+    String json = gson.toJson(data);
+    assertEquals("\"0123456789\"", json);
+  }
+
+  public void testCustomByteArrayDeserializerAndInstanceCreator() {
+    GsonBuilder gsonBuilder = new GsonBuilder().registerTypeAdapter(byte[].class,
+        new JsonDeserializer<byte[]>() {
+      public byte[] deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
+          throws JsonParseException {
+        String str = json.getAsString();
+        byte[] data = new byte[str.length()];
+        for (int i = 0; i < data.length; ++i) {
+          data[i] = Byte.parseByte(""+str.charAt(i));
+        }
+        return data;
+      }
+    });
+    Gson gson = gsonBuilder.create();
+    String json = "'0123456789'";
+    byte[] actual = gson.fromJson(json, byte[].class);
+    byte[] expected = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+    for (int i = 0; i < actual.length; ++i) {
+      assertEquals(expected[i], actual[i]);
+    }
+  }
+
+  private static class StringHolder {
+    String part1;
+    String part2;
+
+    public StringHolder(String string) {
+      String[] parts = string.split(":");
+      part1 = parts[0];
+      part2 = parts[1];
+    }
+    public StringHolder(String part1, String part2) {
+      this.part1 = part1;
+      this.part2 = part2;
+    }
+  }
+
+  private static class StringHolderTypeAdapter implements JsonSerializer<StringHolder>,
+      JsonDeserializer<StringHolder>, InstanceCreator<StringHolder> {
+
+    public StringHolder createInstance(Type type) {
+      //Fill up with objects that will be thrown away
+      return new StringHolder("unknown:thing");
+    }
+
+    public StringHolder deserialize(JsonElement src, Type type,
+        JsonDeserializationContext context) {
+      return new StringHolder(src.getAsString());
+    }
+
+    public JsonElement serialize(StringHolder src, Type typeOfSrc,
+        JsonSerializationContext context) {
+      String contents = src.part1 + ':' + src.part2;
+      return new JsonPrimitive(contents);
+    }
+  }
+
+  // Test created from Issue 70
+  public void testCustomAdapterInvokedForCollectionElementSerializationWithType() {
+    Gson gson = new GsonBuilder()
+      .registerTypeAdapter(StringHolder.class, new StringHolderTypeAdapter())
+      .create();
+    Type setType = new TypeToken<Set<StringHolder>>() {}.getType();
+    StringHolder holder = new StringHolder("Jacob", "Tomaw");
+    Set<StringHolder> setOfHolders = new HashSet<StringHolder>();
+    setOfHolders.add(holder);
+    String json = gson.toJson(setOfHolders, setType);
+    assertTrue(json.contains("Jacob:Tomaw"));
+  }
+
+  // Test created from Issue 70
+  public void testCustomAdapterInvokedForCollectionElementSerialization() {
+    Gson gson = new GsonBuilder()
+      .registerTypeAdapter(StringHolder.class, new StringHolderTypeAdapter())
+      .create();
+    StringHolder holder = new StringHolder("Jacob", "Tomaw");
+    Set<StringHolder> setOfHolders = new HashSet<StringHolder>();
+    setOfHolders.add(holder);
+    String json = gson.toJson(setOfHolders);
+    assertTrue(json.contains("Jacob:Tomaw"));
+  }
+
+  // Test created from Issue 70
+  public void testCustomAdapterInvokedForCollectionElementDeserialization() {
+    Gson gson = new GsonBuilder()
+      .registerTypeAdapter(StringHolder.class, new StringHolderTypeAdapter())
+      .create();
+    Type setType = new TypeToken<Set<StringHolder>>() {}.getType();
+    Set<StringHolder> setOfHolders = gson.fromJson("['Jacob:Tomaw']", setType);
+    assertEquals(1, setOfHolders.size());
+    StringHolder foo = setOfHolders.iterator().next();
+    assertEquals("Jacob", foo.part1);
+    assertEquals("Tomaw", foo.part2);
+  }
+
+  // Test created from Issue 70
+  public void testCustomAdapterInvokedForMapElementSerializationWithType() {
+    Gson gson = new GsonBuilder()
+      .registerTypeAdapter(StringHolder.class, new StringHolderTypeAdapter())
+      .create();
+    Type mapType = new TypeToken<Map<String,StringHolder>>() {}.getType();
+    StringHolder holder = new StringHolder("Jacob", "Tomaw");
+    Map<String, StringHolder> mapOfHolders = new HashMap<String, StringHolder>();
+    mapOfHolders.put("foo", holder);
+    String json = gson.toJson(mapOfHolders, mapType);
+    assertTrue(json.contains("\"foo\":\"Jacob:Tomaw\""));
+  }
+
+  // Test created from Issue 70
+  public void testCustomAdapterInvokedForMapElementSerialization() {
+    Gson gson = new GsonBuilder()
+      .registerTypeAdapter(StringHolder.class, new StringHolderTypeAdapter())
+      .create();
+    StringHolder holder = new StringHolder("Jacob", "Tomaw");
+    Map<String, StringHolder> mapOfHolders = new HashMap<String, StringHolder>();
+    mapOfHolders.put("foo", holder);
+    String json = gson.toJson(mapOfHolders);
+    assertTrue(json.contains("\"foo\":\"Jacob:Tomaw\""));
+  }
+
+  // Test created from Issue 70
+  public void testCustomAdapterInvokedForMapElementDeserialization() {
+    Gson gson = new GsonBuilder()
+      .registerTypeAdapter(StringHolder.class, new StringHolderTypeAdapter())
+      .create();
+    Type mapType = new TypeToken<Map<String, StringHolder>>() {}.getType();
+    Map<String, StringHolder> mapOfFoo = gson.fromJson("{'foo':'Jacob:Tomaw'}", mapType);
+    assertEquals(1, mapOfFoo.size());
+    StringHolder foo = mapOfFoo.get("foo");
+    assertEquals("Jacob", foo.part1);
+    assertEquals("Tomaw", foo.part2);
+  }
+
+  public void testEnsureCustomSerializerNotInvokedForNullValues() {
+    Gson gson = new GsonBuilder()
+        .registerTypeAdapter(DataHolder.class, new DataHolderSerializer())
+        .create();
+    DataHolderWrapper target = new DataHolderWrapper(new DataHolder("abc"));
+    String json = gson.toJson(target);
+    assertEquals("{\"wrappedData\":{\"myData\":\"abc\"}}", json);
+  }
+
+  public void testEnsureCustomDeserializerNotInvokedForNullValues() {
+    Gson gson = new GsonBuilder()
+        .registerTypeAdapter(DataHolder.class, new DataHolderDeserializer())
+        .create();
+    String json = "{wrappedData:null}";
+    DataHolderWrapper actual = gson.fromJson(json, DataHolderWrapper.class);
+    assertNull(actual.wrappedData);
+  }
+
+  // Test created from Issue 352
+  public void testRegisterHierarchyAdapterForDate() {
+    Gson gson = new GsonBuilder()
+        .registerTypeHierarchyAdapter(Date.class, new DateTypeAdapter())
+        .create();
+    assertEquals("0", gson.toJson(new Date(0)));
+    assertEquals("0", gson.toJson(new java.sql.Date(0)));
+    assertEquals(new Date(0), gson.fromJson("0", Date.class));
+    assertEquals(new java.sql.Date(0), gson.fromJson("0", java.sql.Date.class));
+  }
+
+  private static class DataHolder {
+    final String data;
+
+    public DataHolder(String data) {
+      this.data = data;
+    }
+  }
+
+  private static class DataHolderWrapper {
+    final DataHolder wrappedData;
+
+    public DataHolderWrapper(DataHolder data) {
+      this.wrappedData = data;
+    }
+  }
+
+  private static class DataHolderSerializer implements JsonSerializer<DataHolder> {
+    public JsonElement serialize(DataHolder src, Type typeOfSrc, JsonSerializationContext context) {
+      JsonObject obj = new JsonObject();
+      obj.addProperty("myData", src.data);
+      return obj;
+    }
+  }
+
+  private static class DataHolderDeserializer implements JsonDeserializer<DataHolder> {
+    public DataHolder deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
+        throws JsonParseException {
+      JsonObject jsonObj = json.getAsJsonObject();
+      JsonElement jsonElement = jsonObj.get("data");
+      if (jsonElement == null || jsonElement.isJsonNull()) {
+        return new DataHolder(null);
+      }
+      return new DataHolder(jsonElement.getAsString());
+    }
+  }
+
+  private static class DateTypeAdapter implements JsonSerializer<Date>, JsonDeserializer<Date> {
+    public Date deserialize(JsonElement json, Type typeOfT,
+        JsonDeserializationContext context) throws JsonParseException {
+      return typeOfT == Date.class
+          ? new Date(json.getAsLong())
+          : new java.sql.Date(json.getAsLong());
+    }
+    public JsonElement serialize(Date src, Type typeOfSrc, JsonSerializationContext context) {
+      return new JsonPrimitive(src.getTime());
+    }
+  }
+}