Methods for serializing in protocol buffer format. Most of these are just simple wrappers around ByteSize() and SerializeWithCachedSizes().

在类中添加如下语句：static final long serialVersionUID = -15515456L;

from: http://tonycody.blog.51cto.com/8421818/1401422Intellij IDEA 默认没启用这个功能。Setting->Inspections->