diff --git a/java/src/main/java/com/google/protobuf/GeneratedMessage.java b/java/src/main/java/com/google/protobuf/GeneratedMessage.java
index 5cff6fc681..42ccbfd86a 100644
--- a/java/src/main/java/com/google/protobuf/GeneratedMessage.java
+++ b/java/src/main/java/com/google/protobuf/GeneratedMessage.java
@@ -769,7 +769,7 @@ public abstract class GeneratedMessage extends AbstractMessage {
 
     /** For use by generated code only. */
     public void internalInit(final FieldDescriptor descriptor,
-                             final Class type) {
+                             final Class<?> type) {
       if (this.descriptor != null) {
         throw new IllegalStateException("Already initialized.");
       }
@@ -809,7 +809,7 @@ public abstract class GeneratedMessage extends AbstractMessage {
     }
 
     private FieldDescriptor descriptor;
-    private Class type;
+    private Class<?> type;
     private Method enumValueOf;
     private Method enumGetValueDescriptor;
     private Message messageDefaultInstance;
@@ -1054,7 +1054,7 @@ public abstract class GeneratedMessage extends AbstractMessage {
       // Note:  We use Java reflection to call public methods rather than
       //   access private fields directly as this avoids runtime security
       //   checks.
-      protected final Class type;
+      protected final Class<?> type;
       protected final Method getMethod;
       protected final Method setMethod;
       protected final Method hasMethod;
@@ -1118,7 +1118,7 @@ public abstract class GeneratedMessage extends AbstractMessage {
         clearMethod = getMethodOrDie(builderClass, "clear" + camelCaseName);
       }
 
-      protected final Class type;
+      protected final Class<?> type;
       protected final Method getMethod;
       protected final Method getRepeatedMethod;
       protected final Method setRepeatedMethod;
diff --git a/java/src/main/java/com/google/protobuf/GeneratedMessageLite.java b/java/src/main/java/com/google/protobuf/GeneratedMessageLite.java
index 9cdd4e94d1..9a799b44c6 100644
--- a/java/src/main/java/com/google/protobuf/GeneratedMessageLite.java
+++ b/java/src/main/java/com/google/protobuf/GeneratedMessageLite.java
@@ -524,6 +524,7 @@ public abstract class GeneratedMessageLite extends AbstractMessageLite {
     }
 
     /** For use by generated code only. */
+    @SuppressWarnings("unchecked")
     public void internalInitRepeated(
         final ContainingType containingTypeDefaultInstance,
         final MessageLite messageDefaultInstance,
diff --git a/java/src/test/java/com/google/protobuf/DescriptorsTest.java b/java/src/test/java/com/google/protobuf/DescriptorsTest.java
index e60eab39da..c77af5d251 100644
--- a/java/src/test/java/com/google/protobuf/DescriptorsTest.java
+++ b/java/src/test/java/com/google/protobuf/DescriptorsTest.java
@@ -70,6 +70,7 @@ public class DescriptorsTest extends TestCase {
   // Regression test for bug where referencing a FieldDescriptor.Type value
   // before a FieldDescriptorProto.Type value would yield a
   // ExceptionInInitializerError.
+  @SuppressWarnings("unused")
   private static final Object STATIC_INIT_TEST = FieldDescriptor.Type.BOOL;
 
   public void testFieldTypeEnumMapping() throws Exception {
diff --git a/src/google/protobuf/compiler/java/java_enum.cc b/src/google/protobuf/compiler/java/java_enum.cc
index 85e39f5317..e796587f4e 100644
--- a/src/google/protobuf/compiler/java/java_enum.cc
+++ b/src/google/protobuf/compiler/java/java_enum.cc
@@ -138,7 +138,7 @@ void EnumGenerator::Generate(io::Printer* printer) {
     "    internalValueMap =\n"
     "      new com.google.protobuf.Internal.EnumLiteMap<$classname$>() {\n"
     "        public $classname$ findValueByNumber(int number) {\n"
-    "          return $classname$.valueOf(number)\n;"
+    "          return $classname$.valueOf(number);\n"
     "        }\n"
     "      };\n"
     "\n",
@@ -190,6 +190,7 @@ void EnumGenerator::Generate(io::Printer* printer) {
     printer->Print(
       "\n"
       "};\n"
+      "\n"
       "public static $classname$ valueOf(\n"
       "    com.google.protobuf.Descriptors.EnumValueDescriptor desc) {\n"
       "  if (desc.getType() != getDescriptor()) {\n"
@@ -197,20 +198,26 @@ void EnumGenerator::Generate(io::Printer* printer) {
       "      \"EnumValueDescriptor is not for this type.\");\n"
       "  }\n"
       "  return VALUES[desc.getIndex()];\n"
-      "}\n",
+      "}\n"
+      "\n",
       "classname", descriptor_->name());
+
+    // index is only used for reflection; lite implementation does not need it
+    printer->Print("private final int index;\n");
   }
 
   // -----------------------------------------------------------------
 
   printer->Print(
-    "private final int index;\n"
-    "private final int value;\n"
-    "private $classname$(int index, int value) {\n"
-    "  this.index = index;\n"
-    "  this.value = value;\n"
-    "}\n",
+    "private final int value;\n\n"
+    "private $classname$(int index, int value) {\n",
     "classname", descriptor_->name());
+  if (HasDescriptorMethods(descriptor_)) {
+    printer->Print("  this.index = index;\n");
+  }
+  printer->Print(
+    "  this.value = value;\n"
+    "}\n");
 
   if (HasDescriptorMethods(descriptor_)) {
     // Force the static initialization code for the file to run, since it may
diff --git a/src/google/protobuf/compiler/java/java_message.cc b/src/google/protobuf/compiler/java/java_message.cc
index a326057176..8b91193fcb 100644
--- a/src/google/protobuf/compiler/java/java_message.cc
+++ b/src/google/protobuf/compiler/java/java_message.cc
@@ -420,15 +420,18 @@ GenerateMessageSerializationMethods(io::Printer* printer) {
   if (descriptor_->extension_range_count() > 0) {
     if (descriptor_->options().message_set_wire_format()) {
       printer->Print(
-        "com.google.protobuf.GeneratedMessage$lite$.ExtendableMessage\n"
-        "  .ExtensionWriter extensionWriter =\n"
+        "com.google.protobuf.GeneratedMessage$lite$\n"
+        "  .ExtendableMessage<$classname$>.ExtensionWriter extensionWriter =\n"
         "    newMessageSetExtensionWriter();\n",
-        "lite", HasDescriptorMethods(descriptor_) ? "" : "Lite");
+        "lite", HasDescriptorMethods(descriptor_) ? "" : "Lite",
+        "classname", ClassName(descriptor_));
     } else {
       printer->Print(
-        "com.google.protobuf.GeneratedMessage$lite$.ExtendableMessage\n"
-        "  .ExtensionWriter extensionWriter = newExtensionWriter();\n",
-        "lite", HasDescriptorMethods(descriptor_) ? "" : "Lite");
+        "com.google.protobuf.GeneratedMessage$lite$\n"
+        "  .ExtendableMessage<$classname$>.ExtensionWriter extensionWriter =\n"
+        "    newExtensionWriter();\n",
+        "lite", HasDescriptorMethods(descriptor_) ? "" : "Lite",
+        "classname", ClassName(descriptor_));
     }
   }