Anybody here? :) On Thursday, May 14, 2020 at 7:00:47 PM UTC+3, Alex T wrote: > > Hi Tatu! > > I need to serialize/deserialize untyped collections, and I get issue when > deserialing. I push failing unit test in my repository: > https://github.com/alex-t0/deserialization-fail-example/blob/master/src/test/java/deserialization/fail/example/DeserializationFromUntypedCollectionsTest.java > . > > In this test I have simple User class and dummy UserContainer class, that > has one User property. Next, I create an array of 2 elements: user and > userContainer with reference to same user. > > When first element of array is user, and second is container - > deserialization works fine. I get this serialized string: > > [ > "java.util.ArrayList", > [ > [ > "deserialization.fail.example.User", > { > "id": 42, > "login": "cool_man" > } > ], > [ > "deserialization.fail.example.UserContainer", > { > "user": 42 > } > ] > ] > ] > > Because jackson knows what is 42 here. > > But if I put userContainer at first place in my array, and user at second > place, serialized data would be > > [ > "java.util.ArrayList", > [ > [ > "deserialization.fail.example.UserContainer", > { > "user": [ > "deserialization.fail.example.User", > { > "id": 42, > "login": "cool_man" > } > ] > } > ], > 42 > ] > ] > > So, user serialized as id, but no type information saved about user. And > when I deserialize this I get an array with Integer 42 at second place, not > user. > > How to serialize untyped collections properly? >
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