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If I inherit from a class that is serializable but I specifically do not want my class to be serializable; what's the best way to strictly prevent serialization?
If there was a method in java.io.Serializable maybe I could throw an exception, but Serializable is empty.
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In order to prevent subclass from serialization we need to implement writeObject() and readObject() methods which are executed by JVM during serialization and deserialization also NotSerializableException is made to be thrown from these methods.
There is no direct way to prevent sub-class from serialization in java. One possible way by which a programmer can achieve this is by implementing the writeObject() and readObject() methods in the subclass and needs to throw NotSerializableException from these methods.
You must explicitly mark each derived class as [Serializable] . If, however, you mean the ISerializable interface, then yes: interface implementations are inherited, but you need to be careful - for example by using a virtual method so that derived classes can contribute their data to the serialization.
It'll throw a NotSerializableException when you try to Serialize it. To avoid that, make that field a transient field.
From the documentation
Serialization of an object can be prevented by implementing writeObject and readObject methods that throw the NotSerializableException. The exception will be caught by the ObjectOutputStream and abort the serialization process.
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