Deserializing data from an untrusted source is a major security vulnerability, as it allows for the reconstruction of complex object graphs without proper validation.
By design, the ArrayList class in Java is serializable by default. This means you don't need to implement any special interfaces to write an ArrayList to a byte stream using ObjectOutputStream . The real catch is that every inside that list must also implement java.io.Serializable . If even one object in a list of thousands fails this requirement, the entire process crashes with a NotSerializableException . The "Disaster" of Java Serialization Android Java Serialize Arraylist
While functional, standard Java serialization is often described by language designers as a "disaster" for several reasons: Deserializing data from an untrusted source is a
Because of these flaws, the Android ecosystem has largely moved toward more specialized solutions: The real catch is that every inside that
It bypasses constructors and uses reflection to "scrape" private fields directly from memory to create a byte stream.