火烧径-make life easier

版权声明：转载时请以超链接形式标明文章原始出处和作者信息及本声明
http://fireshort.blogbus.com/logs/1198167.html

 "When java tries to deserialize an object, it compares the serialized object's serialVersionUID with that of the class the JVM  is using for deserializing the object. ...
If the two numbers don't match, the JVM assumes the class is not compatible with the previously-serialized object, and you'll get an exception during deserialization.
So, the solution is to put a serialVersionUID in your class, and then as the class evolves, the serialVersionUID will remain the same and the JVM will say, "Ok, cool, the class is compatible with this serialized object." even though the class has actually changes"

If the class has been changed and you want the JVM to not to load the previously serialized classes then the serialVersionUID . Otherwise leave it alone.