Java – Retrieves Msgpack from HTTP requests in Java

I’m trying to retrieve an msgpack object sent by my Rails server in AsyncTask.

Rails Controller – Rails

respond_to do |format|
      format.json { render json: data.to_json }
      format.msgpack { render msgpack: data.to_msgpack }
end

Asynchronous tasks – Java

        HttpEntity messageEntity = httpResponse.getEntity();

if (messageEntity != null) {
                MessagePack msgpack = new MessagePack();

ByteArrayOutputStream baos = new ByteArrayOutputStream();
                messageEntity.writeTo(baos);
                byte[] bytes = baos.toByteArray();

msgpack.read(bytes);    

[...]
            } 

My object is shown below

{
    "aspects": {
        "1438166757890": {
            "deleted": "0",
            "name": "Choc",
            "updated": "1438166757889"
        },
    [...]
    },
    "items": {
        "1438166757872": {
            "aspects": [
                1438166757890,
                1438166757905,
                1438166757929,
                1438166757947,
                1438166757964,
                1438166757980,
                1438166757997
            ],
            "deleted": "0",
            "name": "OTHER",
            "updated": "1438166757872"
        },
    [...]
    }
}

But when I try to read it with my msgpack such an object

Value v = msgpack.read(bytes);

I have this error

java.io.IOException: Invalid byte: -39

Or when I use those templates

Map<String, Map<Integer, Map<String, String>>> v = msgpack.read(bytes, k);

I got it

org.msgpack.MessageTypeException: Unexpected array value
Either
org.msgpack.MessageTypeException: Unexpected map value

I didn’t find any good documentation on Stack or Google about this way of reading. Msgpack serializes and deserializes a List<String>

List<String> src = new ArrayList<String>();
src.add("msgpack");
src.add("kumofs");
src.add("viver");

MessagePack msgpack = new MessagePack();

byte[] raw = msgpack.write(src);

Value dynamic = msgpack.read(raw);
List<String> dst2 = new Converter(dynamic)
    .read(Templates.tList(Templates.TString));

Has anyone encountered this issue? If so, how do I manage Msgpack templates in Java?

Edit:

I use msgpack.read(bytes); When the stack trace has no template:

W/System.err( 2999): java.io.IOException: Invalid byte: -39
W/System.err( 2999): at org.msgpack.unpacker.MessagePackUnpacker.readOneWithoutStackLarge(MessagePackUnpacker.java:323)
W/System.err( 2999): at org.msgpack.unpacker.MessagePackUnpacker.readOneWithoutStack(MessagePackUnpacker.java:139)
W/System.err( 2999): at org.msgpack.unpacker.MessagePackUnpacker.readOne(MessagePackUnpacker.java:73)
W/System.err( 2999): at org.msgpack.unpacker.MessagePackUnpacker.readValue(MessagePackUnpacker.java:559)
W/System.err( 2999): at org.msgpack.unpacker.AbstractUnpacker.readValue(AbstractUnpacker.java:65)
W/System.err( 2999): at org.msgpack.MessagePack.read(MessagePack.java:297)
W/System.err( 2999): at org.msgpack.MessagePack.read(MessagePack.java:283)

When I use

Template<Map<String, String>> map2 = Templates.tMap(Templates.TString, Templates.TString);

Map<String, String> v = msgpack.read(bytes, map2);

Stack trace:

W/System.err( 1510): org.msgpack.MessageTypeException: Unexpected array value
W/System.err( 1510): at org.msgpack.unpacker.Accept.acceptArray(Accept.java:79)
W/System.err( 1510): at org.msgpack.unpacker.MessagePackUnpacker.readOneWithoutStackLarge(MessagePackUnpacker.java:264)
W/System.err( 1510): at org.msgpack.unpacker.MessagePackUnpacker.readOneWithoutStack(MessagePackUnpacker.java:139)
W/System.err( 1510): at org.msgpack.unpacker.MessagePackUnpacker.readOne(MessagePackUnpacker.java:73)
W/System.err( 1510): at org.msgpack.unpacker.MessagePackUnpacker.readString(MessagePackUnpacker.java:472)
W/System.err( 1510): at org.msgpack.template.StringTemplate.read(StringTemplate.java:46)
W/System.err( 1510): at org.msgpack.template.StringTemplate.read(StringTemplate.java:25)
W/System.err( 1510): at org.msgpack.template.AbstractTemplate.read(AbstractTemplate.java:31)
W/System.err( 1510): at org.msgpack.template.MapTemplate.read(MapTemplate.java:72)
W/System.err( 1510): at org.msgpack.template.MapTemplate.read(MapTemplate.java:27)
W/System.err( 1510): at org.msgpack.template.AbstractTemplate.read(AbstractTemplate.java:31)
W/System.err( 1510): at org.msgpack.template.MapTemplate.read(MapTemplate.java:72)
W/System.err( 1510): at org.msgpack.template.MapTemplate.read(MapTemplate.java:27)
W/System.err( 1510): at org.msgpack.template.AbstractTemplate.read(AbstractTemplate.java:31)
W/System.err( 1510): at org.msgpack.template.MapTemplate.read(MapTemplate.java:72)
W/System.err( 1510): at org.msgpack.template.MapTemplate.read(MapTemplate.java:27)
W/System.err( 1510): at org.msgpack.template.AbstractTemplate.read(AbstractTemplate.java:31)
W/System.err( 1510): at org.msgpack.MessagePack.read(MessagePack.java:510)
W/System.err( 1510): at org.msgpack.MessagePack.read(MessagePack.java:479)

Thanks to @naXa’s analysis, I decided to look for another msgpack repository on git. After some research, I found MessagePack for Java

After extracting the file, I used sbt to build my .jar file from there via the command ./sbt publish local.

After the build is complete, I put the main files, source files, and javadoc .jar files into the following directory: ~/msgpack-java-07-develop/msgpack-core/target

I

imported all my .jar files in my Eclipse project, changed the build path, and then in order to retrieve my msgpack contents, I could write these simple lines to get my map containing my value:

HttpEntity messageEntity = httpResponse.getEntity();

if (messageEntity != null) {
    MessagePack msgpack = new MessagePack();

MessageUnpacker u = msgpack.newUnpacker(messageEntity.getContent());
    MapValue mv = (MapValue) u.unpackValue();

Map<Value, Value> map = mv.map();