@Override
                                                                               protected ByteArrayOutputStream initialValue() {
                                                                                   return new ByteArrayOutputStream();
                                                                               }
Hessian2 serializer.

@author jiangping
@version $Id: HessianSerializer.java, v 0.1 2015-10-4 PM9:51:55 tao Exp $
src/main/java/com/alipay/remoting/serialization/HessianSerializer.java