diff --git a/msgpack-jackson/src/main/java/org/msgpack/jackson/dataformat/MessagePackExtensionType.java b/msgpack-jackson/src/main/java/org/msgpack/jackson/dataformat/MessagePackExtensionType.java
index 7a99b1d6b..abceffcb9 100644
--- a/msgpack-jackson/src/main/java/org/msgpack/jackson/dataformat/MessagePackExtensionType.java
+++ b/msgpack-jackson/src/main/java/org/msgpack/jackson/dataformat/MessagePackExtensionType.java
@@ -7,32 +7,35 @@
 import com.fasterxml.jackson.databind.annotation.JsonSerialize;
 
 import java.io.IOException;
-import java.nio.ByteBuffer;
 
 @JsonSerialize(using = MessagePackExtensionType.Serializer.class)
 public class MessagePackExtensionType
 {
-    private final int extType;
-    private final ByteBuffer byteBuffer;
+    private final byte type;
+    private final byte[] data;
 
-    public MessagePackExtensionType(int extType, ByteBuffer byteBuffer) {
-        this.extType = extType;
-        this.byteBuffer = byteBuffer.isReadOnly() ?
-                byteBuffer : byteBuffer.asReadOnlyBuffer();
+    public MessagePackExtensionType(byte type, byte[] data)
+    {
+        this.type = type;
+        this.data = data;
     }
 
-    public int extType() {
-        return extType;
+    public byte getType()
+    {
+        return type;
     }
 
-    public ByteBuffer byteBuffer() {
-        return byteBuffer;
+    public byte[] getData()
+    {
+        return data;
     }
 
-    public static class Serializer extends JsonSerializer<MessagePackExtensionType> {
+    public static class Serializer extends JsonSerializer<MessagePackExtensionType>
+    {
         @Override
         public void serialize(MessagePackExtensionType value, JsonGenerator gen, SerializerProvider serializers)
-                throws IOException, JsonProcessingException {
+                throws IOException, JsonProcessingException
+        {
             if (gen instanceof MessagePackGenerator) {
                 MessagePackGenerator msgpackGenerator = (MessagePackGenerator)gen;
                 msgpackGenerator.writeExtendedType(value);
diff --git a/msgpack-jackson/src/main/java/org/msgpack/jackson/dataformat/MessagePackGenerator.java b/msgpack-jackson/src/main/java/org/msgpack/jackson/dataformat/MessagePackGenerator.java
index 4a7727bed..3bdf2d035 100644
--- a/msgpack-jackson/src/main/java/org/msgpack/jackson/dataformat/MessagePackGenerator.java
+++ b/msgpack-jackson/src/main/java/org/msgpack/jackson/dataformat/MessagePackGenerator.java
@@ -215,9 +215,9 @@ else if (v instanceof Boolean) {
         }
         else if (v instanceof MessagePackExtensionType) {
             MessagePackExtensionType extendedType = (MessagePackExtensionType) v;
-            ByteBuffer buf = extendedType.byteBuffer();
-            messagePacker.packExtensionTypeHeader((byte)extendedType.extType(), buf.remaining());
-            messagePacker.writePayload(buf);
+            byte[] extData = extendedType.getData();
+            messagePacker.packExtensionTypeHeader((byte)extendedType.getType(), extData.length);
+            messagePacker.writePayload(extData);
         }
         else {
             throw new IllegalArgumentException(v.toString());
diff --git a/msgpack-jackson/src/main/java/org/msgpack/jackson/dataformat/MessagePackParser.java b/msgpack-jackson/src/main/java/org/msgpack/jackson/dataformat/MessagePackParser.java
index 9e8ab8b7f..88648c697 100644
--- a/msgpack-jackson/src/main/java/org/msgpack/jackson/dataformat/MessagePackParser.java
+++ b/msgpack-jackson/src/main/java/org/msgpack/jackson/dataformat/MessagePackParser.java
@@ -32,11 +32,7 @@
 import org.msgpack.core.buffer.ArrayBufferInput;
 import org.msgpack.core.buffer.InputStreamBufferInput;
 import org.msgpack.core.buffer.MessageBufferInput;
-import org.msgpack.value.IntegerValue;
-import org.msgpack.value.Value;
-import org.msgpack.value.ValueFactory;
-import org.msgpack.value.ValueType;
-import org.msgpack.value.Variable;
+import org.msgpack.value.*;
 
 import java.io.IOException;
 import java.io.InputStream;
@@ -398,7 +394,8 @@ public Object getEmbeddedObject()
             return value.asBinaryValue().getByteArray();
         }
         else if (value.isExtensionValue()) {
-            return value.asExtensionValue();
+            ExtensionValue extensionValue = value.asExtensionValue();
+            return new MessagePackExtensionType(extensionValue.getType(), extensionValue.getData());
         }
         else {
             throw new UnsupportedOperationException();
diff --git a/msgpack-jackson/src/test/java/org/msgpack/jackson/dataformat/MessagePackGeneratorTest.java b/msgpack-jackson/src/test/java/org/msgpack/jackson/dataformat/MessagePackGeneratorTest.java
index 598b6f730..68eaa4557 100644
--- a/msgpack-jackson/src/test/java/org/msgpack/jackson/dataformat/MessagePackGeneratorTest.java
+++ b/msgpack-jackson/src/test/java/org/msgpack/jackson/dataformat/MessagePackGeneratorTest.java
@@ -76,8 +76,7 @@ public void testGeneratorShouldWriteObject()
         hashMap.put("childArray", childArray);
         // #10
         byte[] hello = "hello".getBytes("UTF-8");
-        ByteBuffer buffer = ByteBuffer.wrap(hello);
-        hashMap.put("ext", new MessagePackExtensionType(17, buffer));
+        hashMap.put("ext", new MessagePackExtensionType((byte) 17, hello));
 
         long bitmap = 0;
         byte[] bytes = objectMapper.writeValueAsBytes(hashMap);
@@ -362,7 +361,7 @@ public void testWritePrimitiveObjectViaObjectMapper()
         OutputStream out = new FileOutputStream(tempFile);
 
         ObjectMapper objectMapper = new ObjectMapper(new MessagePackFactory());
-        objectMapper.disable(JsonGenerator.Feature.AUTO_CLOSE_TARGET);
+        objectMapper.configure(JsonGenerator.Feature.AUTO_CLOSE_TARGET, false);
         objectMapper.writeValue(out, 1);
         objectMapper.writeValue(out, "two");
         objectMapper.writeValue(out, 3.14);
diff --git a/msgpack-jackson/src/test/java/org/msgpack/jackson/dataformat/MessagePackParserTest.java b/msgpack-jackson/src/test/java/org/msgpack/jackson/dataformat/MessagePackParserTest.java
index aaab700af..c280fd30b 100644
--- a/msgpack-jackson/src/test/java/org/msgpack/jackson/dataformat/MessagePackParserTest.java
+++ b/msgpack-jackson/src/test/java/org/msgpack/jackson/dataformat/MessagePackParserTest.java
@@ -167,9 +167,9 @@ else if (k.equals("bool")) {
             else if (k.equals("ext")) {
                 // #9
                 bitmap |= 1 << 10;
-                ExtensionValue extensionValue = (ExtensionValue) v;
-                assertEquals(0, extensionValue.getType());
-                assertArrayEquals(extPayload, extensionValue.getData());
+                MessagePackExtensionType extensionType = (MessagePackExtensionType) v;
+                assertEquals(0, extensionType.getType());
+                assertArrayEquals(extPayload, extensionType.getData());
             }
         }
         assertEquals(0x7FF, bitmap);
@@ -276,9 +276,9 @@ else if (k.equals("child_map_age")) {
         // #10
         assertEquals(true, array.get(i++));
         // #11
-        ExtensionValue extensionValue = (ExtensionValue) array.get(i++);
-        assertEquals(-1, extensionValue.getType());
-        assertArrayEquals(extPayload, extensionValue.getData());
+        MessagePackExtensionType extensionType = (MessagePackExtensionType) array.get(i++);
+        assertEquals(-1, extensionType.getType());
+        assertArrayEquals(extPayload, extensionType.getData());
     }
 
     @Test
@@ -479,7 +479,7 @@ public void testReadPrimitiveObjectViaObjectMapper()
 
         FileInputStream in = new FileInputStream(tempFile);
         ObjectMapper objectMapper = new ObjectMapper(new MessagePackFactory());
-        objectMapper.disable(JsonParser.Feature.AUTO_CLOSE_SOURCE);
+        objectMapper.configure(JsonParser.Feature.AUTO_CLOSE_SOURCE, false);
         assertEquals("foo", objectMapper.readValue(in, new TypeReference<String>() {}));
         assertEquals(Long.MAX_VALUE, objectMapper.readValue(in, new TypeReference<Long>() {}));
         assertEquals(3.14, objectMapper.readValue(in, new TypeReference<Double>() {}));