diff --git a/java/src/main/java/org/msgpack/CustomConverter.java b/java/src/main/java/org/msgpack/CustomConverter.java
index 59054196..4351464c 100644
--- a/java/src/main/java/org/msgpack/CustomConverter.java
+++ b/java/src/main/java/org/msgpack/CustomConverter.java
@@ -20,8 +20,8 @@ package org.msgpack;
 import java.util.Map;
 import java.util.HashMap;
 
-// FIXME public?
-class CustomConverter {
+// FIXME package private?
+public class CustomConverter {
 	public static void register(Class target, MessageConverter converter) {
 		map.put(target, converter);
 	}
diff --git a/java/src/main/java/org/msgpack/CustomPacker.java b/java/src/main/java/org/msgpack/CustomPacker.java
index f828c310..f0c6b62c 100644
--- a/java/src/main/java/org/msgpack/CustomPacker.java
+++ b/java/src/main/java/org/msgpack/CustomPacker.java
@@ -20,8 +20,8 @@ package org.msgpack;
 import java.util.Map;
 import java.util.HashMap;
 
-// FIXME public?
-class CustomPacker {
+// FIXME package private?
+public class CustomPacker {
 	public static void register(Class target, MessagePacker converter) {
 		map.put(target, converter);
 	}
diff --git a/java/src/main/java/org/msgpack/CustomUnpacker.java b/java/src/main/java/org/msgpack/CustomUnpacker.java
index 255368da..b6047b84 100644
--- a/java/src/main/java/org/msgpack/CustomUnpacker.java
+++ b/java/src/main/java/org/msgpack/CustomUnpacker.java
@@ -20,8 +20,8 @@ package org.msgpack;
 import java.util.Map;
 import java.util.HashMap;
 
-// FIXME public?
-class CustomUnpacker {
+// FIXME package private?
+public class CustomUnpacker {
 	public static void register(Class target, MessageUnpacker converter) {
 		map.put(target, converter);
 	}
diff --git a/java/src/main/java/org/msgpack/Packer.java b/java/src/main/java/org/msgpack/Packer.java
index 687f09cc..dd8cdee2 100644
--- a/java/src/main/java/org/msgpack/Packer.java
+++ b/java/src/main/java/org/msgpack/Packer.java
@@ -473,11 +473,19 @@ public class Packer {
 			return packDouble((Double)o);
 		} else if(o instanceof BigInteger) {
 			return packBigInteger((BigInteger)o);
-		} else {
-			// FIXME check CustomPacker.get(o.getClass());
-			// FIXME check annotations
-			throw new MessageTypeException("unknown object "+o+" ("+o.getClass()+")");
 		}
+
+		Class klass = o.getClass();
+
+		MessagePacker packer = CustomPacker.get(klass);
+		if(packer != null) {
+			packer.pack(this, o);
+			return this;
+		}
+
+		// FIXME check annotations -> code generation -> CustomMessage.registerPacker
+
+		throw new MessageTypeException("unknown object "+o+" ("+o.getClass()+")");
 	}
 }
 
diff --git a/java/src/main/java/org/msgpack/Templates.java b/java/src/main/java/org/msgpack/Templates.java
index 4c3fdaee..a31dd919 100644
--- a/java/src/main/java/org/msgpack/Templates.java
+++ b/java/src/main/java/org/msgpack/Templates.java
@@ -28,6 +28,10 @@ public class Templates {
 		return new MapTemplate(keyTemplate, valueTemplate);
 	}
 
+	public static Template tClass(Class target) {
+		return new ClassTemplate(target);
+	}
+
 
 	public static final Template TString = StringTemplate.getInstance();
 
diff --git a/java/src/main/java/org/msgpack/Unpacker.java b/java/src/main/java/org/msgpack/Unpacker.java
index 1b5621f3..4e397488 100644
--- a/java/src/main/java/org/msgpack/Unpacker.java
+++ b/java/src/main/java/org/msgpack/Unpacker.java
@@ -573,10 +573,25 @@ public class Unpacker implements Iterable<MessagePackObject> {
 		obj.messageUnpack(this);
 	}
 
-	final public Object unpack(Class klass) throws MessageTypeException {
-		// FIXME check MessageUnpackable
-		// FIXME check CustomPacker
-		// FIXME check annotations
+	final public Object unpack(Class klass) throws IOException, MessageTypeException, InstantiationException, IllegalAccessException {
+		if(MessageUnpackable.class.isAssignableFrom(klass)) {
+			Object obj = klass.newInstance();
+			((MessageUnpackable)obj).messageUnpack(this);
+			return obj;
+		}
+
+		MessageUnpacker unpacker = CustomUnpacker.get(klass);
+		if(unpacker != null) {
+			return unpacker.unpack(this);
+		}
+
+		// FIXME check annotations -> code generation -> CustomMessage.registerTemplate
+
+		MessageConverter converter = CustomConverter.get(klass);
+		if(converter != null) {
+			return converter.convert(unpackObject());
+		}
+
 		throw new MessageTypeException();
 	}
 }
diff --git a/java/src/main/java/org/msgpack/template/ClassTemplate.java b/java/src/main/java/org/msgpack/template/ClassTemplate.java
index b5ed854d..c529edd2 100644
--- a/java/src/main/java/org/msgpack/template/ClassTemplate.java
+++ b/java/src/main/java/org/msgpack/template/ClassTemplate.java
@@ -28,16 +28,35 @@ public class ClassTemplate implements Template {
 	}
 
 	public Object unpack(Unpacker pac) throws IOException, MessageTypeException {
-		return pac.unpack(klass);
+		try {
+			return pac.unpack(klass);
+		} catch (IllegalAccessException e) {
+			throw new MessageTypeException(e.getMessage());  // FIXME
+		} catch (InstantiationException e) {
+			throw new MessageTypeException(e.getMessage());  // FIXME
+		}
 	}
 
 	public Object convert(MessagePackObject from) throws MessageTypeException {
+		if(MessageConvertable.class.isAssignableFrom(klass)) {
+			Object obj;
+			try {
+				obj = klass.newInstance();
+			} catch (IllegalAccessException e) {
+				throw new MessageTypeException(e.getMessage());  // FIXME
+			} catch (InstantiationException e) {
+				throw new MessageTypeException(e.getMessage());  // FIXME
+			}
+			((MessageConvertable)obj).messageConvert(from);
+			return obj;
+		}
+
 		MessageConverter converter = CustomConverter.get(klass);
 		if(converter != null) {
 			return converter.convert(from);
 		}
 
-		// FIXME check annotations
+		// FIXME check annotations -> code generation -> CustomMessage.registerTemplate
 
 		throw new MessageTypeException();
 	}