Networking · interview question
How would you explain a common issue when using ObjectMapper to deserialize nested JSON objects into Java classes in an interview?
Multiple choiceHardchapter-11-curatedpremiumnetworkinghttpclient-basics
Answer and explanation
Correct answer
C. Missing type information for polymorphic types
Why
When deserializing JSON into polymorphic types, ObjectMapper requires additional type information to correctly instantiate the appropriate subclass. This is often done using annotations or configuration to include type metadata in the JSON.
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