<dependencies> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.13.0</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.13.0</version> </dependency> </dependencies> ObjectMapper objectMapper = new ObjectMapper(); User user = objectMapper.readValue(jsonStr, User.class); ObjectMapper objectMapper = new ObjectMapper(); String jsonStr = objectMapper.writeValueAsString(user);