Jackson and Gson are the two most used JSON libraries for Java. Jackson is the default in Spring Boot; Gson is a lighter alternative popular in Android.
1. Jackson
See the full Jackson Tutorial for marshalling and unmarshalling Java objects to and from JSON.
For the java.time serialization error, see Java 8 date and time type not supported by default.
2. Gson
See the full Gson Tutorial for toJson() and fromJson() examples.
Happy Learning !!
