Jackson can't serialize Integer (or basic types) #230

ObjectMapper msgPackObjectMapper = new ObjectMapper(new MessagePackFactory());
byte[] msgPack = msgPackObjectMapper.writeValueAsBytes(1); // Throws

com.fasterxml.jackson.databind.JsonMappingException: The stack is empty
    at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:139)
    at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:2881)
    at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsBytes(ObjectMapper.java:2362)
        ...
Caused by: java.lang.IllegalStateException: The stack is empty
    at org.msgpack.jackson.dataformat.MessagePackGenerator.getStackTop(MessagePackGenerator.java:371)
    at org.msgpack.jackson.dataformat.MessagePackGenerator.addValueToStackTop(MessagePackGenerator.java:397)
    at org.msgpack.jackson.dataformat.MessagePackGenerator.writeNumber(MessagePackGenerator.java:284)
    at com.fasterxml.jackson.databind.ser.std.NumberSerializers$IntegerSerializer.serialize(NumberSerializers.java:138)
    at com.fasterxml.jackson.databind.ser.std.NumberSerializers$IntegerSerializer.serialize(NumberSerializers.java:131)
    at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:128)
       ...

ByteArrayOutputStream out = new ByteArrayOutputStream();
MessagePack.newDefaultPacker(out).packInt(1).close();