"The stream is not keyed by field name, each read call simply consumes the next value in sequence. If readUTF were called before readInt, the stream would attempt to interpret the bytes of an integer as a UTF string, resulting in corrupted data or a deserialization failure."
"Serialization is fragile when classes change. Even small modifications can make previously stored data unreadable. Deserializing untrusted data is particularly dangerous, as it can trigger unexpected code paths on attacker-controlled object graphs."
"Java serialization should be used only in controlled environments. It is suitable only for a narrow set of use cases where class versions and trust boundaries are tightly controlled."
Custom serialization requires that the order of written values matches the order of read values to prevent data corruption. The stream processes values sequentially, so incorrect order leads to misinterpretation of data types. Serialization is fragile, especially with class changes, making previously stored data unreadable. Deserializing untrusted data poses security risks, as it can trigger unexpected code paths. Java serialization is best used in controlled environments, suitable for internal caching and session storage when class versions and trust boundaries are managed.
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