Core Dependencies <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.7.9</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>...
Converting JSON to a Plain Old Java Object (POJO) The ObjectMapper class is the primary entry point for Jackson. It can be used to convert JSON strings into Java objects and vice versa. Below is an example of deserializing a JSON string into a Person object and then serializing that object back to a...
Understanding Byte Data Units A byte (abbreviated as B) is the fundamental unit of digital information storage, consisting of 8 bits. In ASCII encoding, a single byte can represent standard English characters, numbers, punctuation, and control characters. Modern systems commonly use larger units for...
Redis Connection Factory Configuration Spring Boot 2.x introduces significant changes to Redis auto-configuration. The Jedis client setup requires explicit bean definitions with updated APIs. Required Dependency <dependency> <groupId>org.springframework.boot</groupId> <artifactI...
Performance-sensitive systems often move JSON back and forth at high volume. When latency or throughput matters, the choice of JSON library can influence CPU time and allocation rates. Using JMH, the runtime characteristics of four popular Java libraries—Gson, Fastjson, Jackson, and json-lib—are con...
RabbitMQ transports raw bytes. Too exchange domain objects as JSON, you can serialize manually or configure Spring AMQP to handle JSON automatically for both producers and consumers. Manual JSON serialization with ObjectMapper You can convert a POJO to JSON yourself and publish the resulting bytes....
Symptom When a request body contains date-time strings such as "2020-05-04 00:00" and the target fields are of type java.time.LocalDateTime, Spring Boot (via Jackson) fails to deserialize: org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot deserial...