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the manner of action of scala @Serializable is different from Java Serializable?
I mean the way to serialize objects or both use the same standard serialization?
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Serializing an object means taking the data stored in an object and converting it to bytes (or a string). Suppose you want to write the data in an object to a JSON file. JSON files store strings. JSON has no understanding about the JVM or Scala objects.
Serializable interface passes the responsibility of serialization to JVM and the programmer has no control over serialization, and it is a default algorithm. The externalizable interface provides all serialization responsibilities to a programmer and hence JVM has no control over serialization.
All case classes automatically extend Product and Serializable . It looks ugly ? yes. Basically , Product can be viewed as heterogeneous collections.
Externalization provides implementation logic control to the application by overriding readExternal and writeExternal methods. In serializable interface uses reflection which causes relatively slow performance. Externalizable gives full control over the implementation approach.
Well Scala compiles to JVM byte code, so the only difference comes from how Scala implements this conversion. Scala converts the annotation to the interface during type checking which can lead to some subtle problems see here.
Afaik @Serializable is deprecated anyhow - compared to other annotations (volatile annotation instead of a specifier) in scala I don't see much advantages anyhow.. doesn't make the code much clearer or simpler.
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