Kyro - To register this class use: kryo.register

报错信息

Exception in thread "main" java.lang.IllegalArgumentException: Class is not registered: tech.luxsun.interview.luxinterviewstarter.demo.clone.Rectangle
Note: To register this class use: kryo.register(tech.luxsun.interview.luxinterviewstarter.demo.clone.Rectangle.class);
  at com.esotericsoftware.kryo.Kryo.getRegistration(Kryo.java:508)
  at com.esotericsoftware.kryo.Kryo.getSerializer(Kryo.java:530)
  at com.esotericsoftware.kryo.Kryo.copy(Kryo.java:908)
  at tech.luxsun.interview.luxinterviewstarter.demo.clone.Demo.copyByKryo(Demo.java:44)
  at tech.luxsun.interview.luxinterviewstarter.demo.clone.Demo.main(Demo.java:37)

原因分析

4.0版本 registrationRequired 的值默认为 false，升级到 5.0 后默认为 true，需要手动设置为 false

解决方案

public static <T> T copyByKryo(T source){
    Kryo kryo = new Kryo();
    kryo.setRegistrationRequired(false);
    return kryo.copy(source);
}