How to deserialize a java map

I am trying to de-serialize bytes into an object in Go, which was serialized into bytes in Java, in the following way:

//myMap is an instance of Java TreeMap<String, Object>ByteArrayOutputStream a = new ByteArrayOutputStream();GZIPOutputStream b = new GZIPOutputStream(a);ObjectOutputStream c = new ObjectOutputStream(b);c.writeObject(myMap);c.close();byte[] bytes = a.toByteArray()

Below are the attempts I made

step1 - uncompressed the bytes (in the variable result) using

   //att is the byte array received    buf := bytes.NewBuffer(att)   reader, _ := gzip.NewReader(buf)   defer reader.Close()   result , _ := ioutil.ReadAll(reader)

step2 - read object out of uncompressed bytes - but failed

    var decodedMap map[string]interface{}    d := gob.NewDecoder(bytes.NewBuffer(*result*))    err = d.Decode(&decodedMap)    if err != nil {        panic(err)    }       error = gob: encoded unsigned integer out of range

But when I convert the (byte array) result to string in Go, I see the encoded treemap details and the contents

   map:  �� sr java.util.TreeMap��>-%j� Lt NAMEt JOHNt AGEt 32t LOCODEsr java.lang.Long;���̏#� J valuexr java.lang.Number������  xp  y

Can someone help me out here?