Serialization transforms complex in-memory objects into bytes that services can send over a network or store, then reconstructs structured data through deserialization. section 12.2
In distributed systems, serialization is a contract boundary. Small schema changes can cause dropped fields, default values, or deserialization errors instead of immediate failures. section 12.0 section 12.2
Investigate serialization problems by asking:
- Did one service add or rename a field, change an enum, or alter optionality? section 12.2
- Could an older model silently ignore new data, substitute default values, or reject the payload? section 12.2
- Can forward and backward compatibility let services evolve independently? section 12.2
message Order {
int64 id = 1;
string customer_id = 2;
repeated string items = 3;
optional string notes = 4;
}
A Protobuf schema defines typed fields and field numbers, including repeated and optional values, from which Java serialization and deserialization classes can be generated. section 12.2
