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I know this might be quite old question, but I am confused. So far as I know, with the Reflection API, we can serialize instances, then why does java need an empty interface like Serializable ? I read from an article that this is designed for safety reasons, i.e., only instances marked Serializable can be serialized. if this is so important however, I see in many frameworks, like kafka, the instances don't have to implement Serializable. won't they encounter safety occasions ? what is the difference ?

feiyuerenhai
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  • Because some things you don't want to serialize, such as passwords. – user207421 May 23 '22 at 05:57
  • Kafka has its own Serializer class. **That is mandated**. Strings, Integers, etc have known byte formats. You shouldn't use Java Serializable types as messages, instead use cross language RPC formats like JSON, AVRO, Protobuf, etc – OneCricketeer May 23 '22 at 12:35

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