public MarshalledObject(T obj) throws IOException 
{
        ByteArrayOutputStream objStream = new ByteArrayOutputStream();
        MarshalledObjectOutputStream moStream = new MarshalledObjectOutputStream(objStream);
        moStream.writeObject(obj);
        moStream.flush();
        objBytes = objStream.toByteArray();
        locBytes = moStream.getLocBytes();
        // calculate hash code
        int hash = 0;
        for (int i = 0; i <  objBytes.length; ++i) {
            hash = hash * 31 + objBytes[i];
        }
        this.hash = hash;
}

 public boolean equals(Object obj) 
{
        if (!(obj instanceof MarshalledObject)) {
            return false;
        }
        MarshalledObject anotherObj = (MarshalledObject) obj;
        return (hash == anotherObj.hash) || (Arrays.equals(objBytes, anotherObj.objBytes));
}

 public T get() throws IOException, ClassNotFoundException 
{
        if (objBytes == null) {
            return null;
        }
        MarshalledObjectInputStream moin = new MarshalledObjectInputStream(objBytes, locBytes);
        return (T) moin.readObject();
}

 public int hashCode() 
{
        return hash;
}