diff --git a/gson/src/main/java/com/google/gson/GsonBuilder.java b/gson/src/main/java/com/google/gson/GsonBuilder.java
index 61b6f123..dd7d160f 100644
--- a/gson/src/main/java/com/google/gson/GsonBuilder.java
+++ b/gson/src/main/java/com/google/gson/GsonBuilder.java
@@ -319,6 +319,7 @@ public final class GsonBuilder {
    * {@link JsonSerializer}, and a {@link JsonDeserializer} interfaces.
    * @return a reference to this {@code GsonBuilder} object to fulfill the "Builder" pattern
    */
+  @SuppressWarnings("unchecked")
   public GsonBuilder registerTypeAdapter(Type type, Object typeAdapter) {
     Preconditions.checkArgument(typeAdapter instanceof JsonSerializer
         || typeAdapter instanceof JsonDeserializer || typeAdapter instanceof InstanceCreator);
diff --git a/gson/src/main/java/com/google/gson/TypeInfoFactory.java b/gson/src/main/java/com/google/gson/TypeInfoFactory.java
index deb88a2f..2bcdb82e 100644
--- a/gson/src/main/java/com/google/gson/TypeInfoFactory.java
+++ b/gson/src/main/java/com/google/gson/TypeInfoFactory.java
@@ -55,6 +55,7 @@ final class TypeInfoFactory {
     return new TypeInfo(actualType);
   }
 
+  @SuppressWarnings("unchecked")
   private static Type getActualType(
       Type typeToEvaluate, Type parentType, Class<?> rawParentClass) {
     if (typeToEvaluate instanceof Class) {
diff --git a/gson/src/main/java/com/google/gson/TypeInfoMap.java b/gson/src/main/java/com/google/gson/TypeInfoMap.java
index ea8eb07b..82f4b19f 100644
--- a/gson/src/main/java/com/google/gson/TypeInfoMap.java
+++ b/gson/src/main/java/com/google/gson/TypeInfoMap.java
@@ -31,6 +31,7 @@ final class TypeInfoMap {
   private final Type keyType;
   private final Type valueType;
   
+  @SuppressWarnings("unchecked")
   public TypeInfoMap(Type mapType) {
     if (mapType instanceof Class && Properties.class.isAssignableFrom((Class<?>) mapType)) {
       keyType = String.class;
diff --git a/gson/src/main/java/com/google/gson/TypeUtils.java b/gson/src/main/java/com/google/gson/TypeUtils.java
index acda71a6..c8c03d65 100644
--- a/gson/src/main/java/com/google/gson/TypeUtils.java
+++ b/gson/src/main/java/com/google/gson/TypeUtils.java
@@ -40,6 +40,7 @@ final class TypeUtils {
    * </pre>
    * <code>TypeUtils.getActualTypeForFirstTypeVariable(fooType)</code> will return Integer.class.
    */
+  @SuppressWarnings("unchecked")
   static Type getActualTypeForFirstTypeVariable(Type type) {
     if (type instanceof Class) {
       return Object.class;
@@ -53,6 +54,7 @@ final class TypeUtils {
     }
   }
 
+  @SuppressWarnings("unchecked")
   static boolean isArray(Type type) {
     if (type instanceof Class) {
       return ((Class<?>)type).isArray();
@@ -66,6 +68,7 @@ final class TypeUtils {
   /**
    * This method returns the actual raw class associated with the specified type.
    */
+  @SuppressWarnings("unchecked")
   static Class<?> toRawClass(Type type) {
     if (type instanceof Class) {
       return (Class<?>) type;
diff --git a/gson/src/main/java/com/google/gson/reflect/TypeToken.java b/gson/src/main/java/com/google/gson/reflect/TypeToken.java
index c9eef2f1..4ab1425f 100644
--- a/gson/src/main/java/com/google/gson/reflect/TypeToken.java
+++ b/gson/src/main/java/com/google/gson/reflect/TypeToken.java
@@ -85,6 +85,7 @@ public abstract class TypeToken<T> {
   /**
    * Gets type from super class's type parameter.
    */
+  @SuppressWarnings("unchecked")
   static Type getSuperclassTypeParameter(Class<?> subclass) {
     Type superclass = subclass.getGenericSuperclass();
     if (superclass instanceof Class) {
@@ -154,6 +155,7 @@ public abstract class TypeToken<T> {
   /**
    * Check if this type is assignable from the given Type.
    */
+  @SuppressWarnings("unchecked")
   public boolean isAssignableFrom(Type from) {
     if (from == null) {
       return false;
@@ -188,6 +190,7 @@ public abstract class TypeToken<T> {
    * Private helper function that performs some assignability checks for
    * the provided GenericArrayType.
    */
+  @SuppressWarnings("unchecked")
   private static boolean isAssignableFrom(Type from, GenericArrayType to) {
     Type toGenericComponentType = to.getGenericComponentType();
     if (toGenericComponentType instanceof ParameterizedType) {
@@ -213,6 +216,7 @@ public abstract class TypeToken<T> {
    * Private recursive helper function to actually do the type-safe checking
    * of assignability.
    */
+  @SuppressWarnings("unchecked")
   private static boolean isAssignableFrom(Type from, ParameterizedType to,
       Map<String, Type> typeVarMap) {
 
@@ -289,6 +293,7 @@ public abstract class TypeToken<T> {
    * Checks if two types are the same or are equivalent under a variable mapping
    * given in the type map that was provided.
    */
+  @SuppressWarnings("unchecked")
   private static boolean matches(Type from, Type to,
       Map<String, Type> typeMap) {
     if (to.equals(from)) return true;
diff --git a/gson/src/test/java/com/google/gson/ExposeAnnotationBasedExclusionStrategyTest.java b/gson/src/test/java/com/google/gson/ExposeAnnotationBasedExclusionStrategyTest.java
index 556d7506..1f63f95e 100644
--- a/gson/src/test/java/com/google/gson/ExposeAnnotationBasedExclusionStrategyTest.java
+++ b/gson/src/test/java/com/google/gson/ExposeAnnotationBasedExclusionStrategyTest.java
@@ -51,6 +51,7 @@ public class ExposeAnnotationBasedExclusionStrategyTest extends TestCase {
     assertFalse(strategy.shouldSkipField(f));
   }
 
+  @SuppressWarnings("unused")
   private static class MockObject {
     @Expose
     public final int exposedField = 0;
diff --git a/gson/src/test/java/com/google/gson/JsonParserAsyncTest.java b/gson/src/test/java/com/google/gson/JsonParserAsyncTest.java
index cc615286..9632f8a5 100644
--- a/gson/src/test/java/com/google/gson/JsonParserAsyncTest.java
+++ b/gson/src/test/java/com/google/gson/JsonParserAsyncTest.java
@@ -1,6 +1,5 @@
 package com.google.gson;
 
-import java.util.Enumeration;
 import java.util.Iterator;
 
 import junit.framework.TestCase;
diff --git a/gson/src/test/java/com/google/gson/SerializedNameAnnotationInterceptingNamingPolicyTest.java b/gson/src/test/java/com/google/gson/SerializedNameAnnotationInterceptingNamingPolicyTest.java
index bb9cf92b..a0144a58 100644
--- a/gson/src/test/java/com/google/gson/SerializedNameAnnotationInterceptingNamingPolicyTest.java
+++ b/gson/src/test/java/com/google/gson/SerializedNameAnnotationInterceptingNamingPolicyTest.java
@@ -53,6 +53,7 @@ public class SerializedNameAnnotationInterceptingNamingPolicyTest extends TestCa
     assertEquals(fieldName, policy.translateName(f));
   }
 
+  @SuppressWarnings("unused")
   private static class SomeObject {
     @SerializedName(ANNOTATED_FIELD_NAME) public final int fieldWithAnnotation = 1;
     public final int fieldWithoutAnnotation = 1;
diff --git a/gson/src/test/java/com/google/gson/TypeInfoFactoryTest.java b/gson/src/test/java/com/google/gson/TypeInfoFactoryTest.java
index 913154b8..26155307 100644
--- a/gson/src/test/java/com/google/gson/TypeInfoFactoryTest.java
+++ b/gson/src/test/java/com/google/gson/TypeInfoFactoryTest.java
@@ -223,6 +223,7 @@ public class TypeInfoFactoryTest extends TestCase {
     assertEquals(List[].class, typeInfo.getRawClass());
   }
 
+  @SuppressWarnings("unused")
   private static class ObjectWithDifferentFields<T> {
     public static enum TestEnum {
       TEST_1, TEST_2;
diff --git a/gson/src/test/java/com/google/gson/VersionExclusionStrategyTest.java b/gson/src/test/java/com/google/gson/VersionExclusionStrategyTest.java
index c626ffe0..d044eb34 100644
--- a/gson/src/test/java/com/google/gson/VersionExclusionStrategyTest.java
+++ b/gson/src/test/java/com/google/gson/VersionExclusionStrategyTest.java
@@ -66,6 +66,7 @@ public class VersionExclusionStrategyTest extends TestCase {
 
   @Since(VERSION)
   private static class MockObject {
+    @SuppressWarnings("unused")
     @Since(VERSION)
     public final int someField = 0;
   }
diff --git a/gson/src/test/java/com/google/gson/functional/CollectionTest.java b/gson/src/test/java/com/google/gson/functional/CollectionTest.java
index e0203e11..6d812bdb 100644
--- a/gson/src/test/java/com/google/gson/functional/CollectionTest.java
+++ b/gson/src/test/java/com/google/gson/functional/CollectionTest.java
@@ -283,7 +283,7 @@ public class CollectionTest extends TestCase {
   private static class ObjectWithWildcardCollection {
     private final Collection<? extends BagOfPrimitives> collection;
 
-    @SuppressWarnings("unchecked")
+    @SuppressWarnings({ "unchecked", "unused" })
     public ObjectWithWildcardCollection() {
       this(Collections.EMPTY_LIST);
     }
@@ -299,6 +299,8 @@ public class CollectionTest extends TestCase {
   
   private static class Entry {
     int value;
+    // For use by Gson
+    @SuppressWarnings("unused")
     Entry() {
       this(10);
     }
diff --git a/gson/src/test/java/com/google/gson/functional/ConcurrencyTest.java b/gson/src/test/java/com/google/gson/functional/ConcurrencyTest.java
index 3a1b54af..2dccf4b6 100755
--- a/gson/src/test/java/com/google/gson/functional/ConcurrencyTest.java
+++ b/gson/src/test/java/com/google/gson/functional/ConcurrencyTest.java
@@ -121,6 +121,7 @@ public class ConcurrencyTest extends TestCase {
     assertFalse(failed.get());
   }
   
+  @SuppressWarnings("unused")
   private static class MyObject {
     String a;
     String b;
diff --git a/gson/src/test/java/com/google/gson/functional/CustomDeserializerTest.java b/gson/src/test/java/com/google/gson/functional/CustomDeserializerTest.java
index a3f337e1..b8083d6f 100644
--- a/gson/src/test/java/com/google/gson/functional/CustomDeserializerTest.java
+++ b/gson/src/test/java/com/google/gson/functional/CustomDeserializerTest.java
@@ -65,6 +65,7 @@ public class CustomDeserializerTest extends TestCase {
   private static class DataHolder {
     private final String data;
 
+    @SuppressWarnings("unused")
     public DataHolder() {
       throw new IllegalStateException();
     }
@@ -81,6 +82,7 @@ public class CustomDeserializerTest extends TestCase {
   private static class DataHolderWrapper {
     private final DataHolder wrappedData;
     
+    @SuppressWarnings("unused")
     public DataHolderWrapper() {
       this(new DataHolder(DEFAULT_VALUE));
     }
diff --git a/gson/src/test/java/com/google/gson/functional/DefaultTypeAdaptersTest.java b/gson/src/test/java/com/google/gson/functional/DefaultTypeAdaptersTest.java
index 88ca359d..a173eaca 100644
--- a/gson/src/test/java/com/google/gson/functional/DefaultTypeAdaptersTest.java
+++ b/gson/src/test/java/com/google/gson/functional/DefaultTypeAdaptersTest.java
@@ -289,6 +289,7 @@ public class DefaultTypeAdaptersTest extends TestCase {
   
   private static class ClassWithBigDecimal {
     BigDecimal value;
+    @SuppressWarnings("unused")
     ClassWithBigDecimal() { }
     ClassWithBigDecimal(String value) {
       this.value = new BigDecimal(value);
@@ -300,6 +301,7 @@ public class DefaultTypeAdaptersTest extends TestCase {
 
   private static class ClassWithBigInteger {
     BigInteger value;
+    @SuppressWarnings("unused")
     ClassWithBigInteger() { }
     ClassWithBigInteger(String value) {
       this.value = new BigInteger(value);
diff --git a/gson/src/test/java/com/google/gson/functional/ExposeFieldsTest.java b/gson/src/test/java/com/google/gson/functional/ExposeFieldsTest.java
index bee107b5..40f580f7 100644
--- a/gson/src/test/java/com/google/gson/functional/ExposeFieldsTest.java
+++ b/gson/src/test/java/com/google/gson/functional/ExposeFieldsTest.java
@@ -117,6 +117,7 @@ public class ExposeFieldsTest extends TestCase {
     @Expose(deserialize = false) final double d;
     @Expose(serialize = false, deserialize = false) final char e;
 
+    @SuppressWarnings("unused")
     ClassWithExposedFields() {
       this(null, null);
     }
@@ -141,10 +142,6 @@ public class ExposeFieldsTest extends TestCase {
       sb.append("}");
       return sb.toString();
     }
-
-    public String getExpectedJsonWithoutAnnotations() {
-      return String.format("{\"a\":%d,\"b\":%d,\"c\":%d,\"d\":%f,\"e\":\"%c\"}", a, b, c, d, e);
-    }
   }
 
   private static class ClassWithNoExposedFields {
@@ -170,6 +167,7 @@ public class ExposeFieldsTest extends TestCase {
     @Expose
     private final SomeInterface interfaceField;
     
+    @SuppressWarnings("unused")
     public ClassWithInterfaceField() {
       this(null);
     }
diff --git a/gson/src/test/java/com/google/gson/functional/JsonTreeTest.java b/gson/src/test/java/com/google/gson/functional/JsonTreeTest.java
index 85a6bd5e..195f6f99 100644
--- a/gson/src/test/java/com/google/gson/functional/JsonTreeTest.java
+++ b/gson/src/test/java/com/google/gson/functional/JsonTreeTest.java
@@ -75,6 +75,7 @@ public class JsonTreeTest extends TestCase {
   }
   
   private static class SubTypeOfBagOfPrimitives extends BagOfPrimitives {
+    @SuppressWarnings("unused")
     float f = 1.2F;
     public SubTypeOfBagOfPrimitives(long l, int i, boolean b, String string, float f) {
       super(l, i, b, string);
diff --git a/gson/src/test/java/com/google/gson/functional/MapTest.java b/gson/src/test/java/com/google/gson/functional/MapTest.java
index 895602b8..6e084e0a 100755
--- a/gson/src/test/java/com/google/gson/functional/MapTest.java
+++ b/gson/src/test/java/com/google/gson/functional/MapTest.java
@@ -172,6 +172,7 @@ public class MapTest extends TestCase {
   private static class MyParameterizedMap<K, V> extends LinkedHashMap<K, V> {
     private static final long serialVersionUID = 1L;
 
+    @SuppressWarnings("unused")
     int foo = 10;
   }
   
@@ -248,6 +249,7 @@ public class MapTest extends TestCase {
   private static class MyMap extends LinkedHashMap<String, String> {
     private static final long serialVersionUID = 1L;
 
+    @SuppressWarnings("unused")
     int foo = 10;
   }
   
diff --git a/gson/src/test/java/com/google/gson/functional/NamingPolicyTest.java b/gson/src/test/java/com/google/gson/functional/NamingPolicyTest.java
index a70c0545..5fca249c 100644
--- a/gson/src/test/java/com/google/gson/functional/NamingPolicyTest.java
+++ b/gson/src/test/java/com/google/gson/functional/NamingPolicyTest.java
@@ -82,6 +82,7 @@ public class NamingPolicyTest extends TestCase {
     assertEquals("{\"a\":3.0}", actual);
   }
   
+  @SuppressWarnings("unused")
   private static class ClassWithDuplicateFields {
     public Integer a;
     @SerializedName("a") public Double b;
diff --git a/gson/src/test/java/com/google/gson/functional/NullObjectAndFieldTest.java b/gson/src/test/java/com/google/gson/functional/NullObjectAndFieldTest.java
index f2b94f97..fe9f1ffe 100755
--- a/gson/src/test/java/com/google/gson/functional/NullObjectAndFieldTest.java
+++ b/gson/src/test/java/com/google/gson/functional/NullObjectAndFieldTest.java
@@ -151,6 +151,7 @@ public class NullObjectAndFieldTest extends TestCase {
     private Long value;
   }
 
+  @SuppressWarnings("unused")
   private static class ClassWithMembers {
     String str;
     int[] array;
diff --git a/gson/src/test/java/com/google/gson/functional/ObjectTest.java b/gson/src/test/java/com/google/gson/functional/ObjectTest.java
index e4cae128..9ccd4eb7 100644
--- a/gson/src/test/java/com/google/gson/functional/ObjectTest.java
+++ b/gson/src/test/java/com/google/gson/functional/ObjectTest.java
@@ -351,6 +351,7 @@ public class ObjectTest extends TestCase {
     assertTrue(json.contains("abc"));
   }
   
+  @SuppressWarnings("unused")
   private static class ClassWithObjectField {
     Object member;
   }
@@ -377,6 +378,7 @@ public class ObjectTest extends TestCase {
   }
    
   private static class Parent {
+    @SuppressWarnings("unused")
     int value1 = 1;
     private class Child {
       int value2 = 2;
@@ -389,6 +391,8 @@ public class ObjectTest extends TestCase {
     private Set<Float> set;
     private SortedSet<Character> sortedSet;
 
+    // For use by Gson
+    @SuppressWarnings("unused")
     ClassWithSubInterfacesOfCollection() {
     }
 
@@ -481,6 +485,7 @@ public class ObjectTest extends TestCase {
   private static class SubTypeOfNested extends Nested {
     private final long value = 5;
 
+    @SuppressWarnings("unused")
     public SubTypeOfNested() {
       this(null, null);
     }
@@ -585,7 +590,7 @@ public class ObjectTest extends TestCase {
   public void testArrayOfObjectsWithoutTypeInfoDeserialization() {
     String json = "[1,'abc',{a:1},5]";
     try {
-      Object[] objs = gson.fromJson(json, Object[].class);
+      gson.fromJson(json, Object[].class);
     } catch (JsonParseException expected) {
     }
   }
@@ -593,7 +598,7 @@ public class ObjectTest extends TestCase {
   public void testArrayWithoutTypeInfoDeserialization() {
     String json = "[1,'abc',[1,2],5]";
     try {
-      Object[] objs = gson.fromJson(json, Object[].class);
+      gson.fromJson(json, Object[].class);
     } catch (JsonParseException expected) {
     }
   }
diff --git a/gson/src/test/java/com/google/gson/functional/ParameterizedTypesTest.java b/gson/src/test/java/com/google/gson/functional/ParameterizedTypesTest.java
index f59f3136..bdf9532b 100644
--- a/gson/src/test/java/com/google/gson/functional/ParameterizedTypesTest.java
+++ b/gson/src/test/java/com/google/gson/functional/ParameterizedTypesTest.java
@@ -271,6 +271,7 @@ public class ParameterizedTypesTest extends TestCase {
     private final List<? extends T> listOfWildcardTypeParameters;
     private final List<? extends T>[] arrayOfListOfWildcardTypeParameters;
 
+    @SuppressWarnings("unused")
     public ObjectWithTypeVariables() {
       this(null, null, null, null, null, null);
     }
@@ -386,6 +387,7 @@ public class ParameterizedTypesTest extends TestCase {
     C c;
     D d;
     E e;
+    @SuppressWarnings("unused")
     MultiParameters() {
     }
     MultiParameters(A a, B b, C c, D d, E e) {
@@ -461,9 +463,11 @@ public class ParameterizedTypesTest extends TestCase {
   
   // Begin: tests to reproduce issue 103
   private static class Quantity {
+    @SuppressWarnings("unused")
     int q = 10;
   }
   private static class MyQuantity extends Quantity {
+    @SuppressWarnings("unused")
     int q2 = 20;
   }
   private interface Measurable<T> {    
diff --git a/gson/src/test/java/com/google/gson/metrics/PerformanceTest.java b/gson/src/test/java/com/google/gson/metrics/PerformanceTest.java
index 15cdaf83..196a0bae 100644
--- a/gson/src/test/java/com/google/gson/metrics/PerformanceTest.java
+++ b/gson/src/test/java/com/google/gson/metrics/PerformanceTest.java
@@ -72,6 +72,7 @@ public class PerformanceTest extends TestCase {
   private static class ExceptionHolder {
     public final String message;
     public final String stackTrace;
+    @SuppressWarnings("unused")
     public ExceptionHolder() {
       this("", "");
     }
@@ -81,6 +82,7 @@ public class PerformanceTest extends TestCase {
     }
   }
 
+  @SuppressWarnings("unused")
   private static class CollectionEntry {
     final String name;
     final String value;
@@ -140,7 +142,7 @@ public class PerformanceTest extends TestCase {
       for (int i = 0; i < size; ++i) {
         ba[i] = 0x05;
       }
-      String json = gson.toJson(ba);
+      gson.toJson(ba);
       System.out.printf("Gson could serialize a byte array of size: %d\n", size);
     }
   }