How to deserialize java.time.Instant in Jackson2JsonRedisSerializer

Question

I am using Jackson2JsonRedisSerializer.

@Bean public RedisOperations<String , Aircraft> redisOperations(RedisConnectionFactory factory){ Jackson2JsonRedisSerializer<Aircraft> serializer = new Jackson2JsonRedisSerializer<Aircraft>(Aircraft.class); RedisTemplate<String, Aircraft> template = new RedisTemplate<>(); template.setConnectionFactory(factory); template.setDefaultSerializer(serializer); template.setKeySerializer(new StringRedisSerializer()); return template; }

My aircraft has field of type Instant.

 @JsonProperty("last_seen_time") private Instant lastSeenTime;

While deserializing it gives me an error:

Java 8 date/time type `java.time.Instant` not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling (through reference chain: com.example.chapter6.sburredis.Aircraft["last_seen_time"])

I have already added the maven dependency in my pom.xml

<dependency> <groupId>com.fasterxml.jackson.datatype</groupId> <artifactId>jackson-datatype-jsr310</artifactId> <version>2.14.1</version> </dependency>

The json file is as follows:

{ "aircraft": [ { "id": 108, "callsign": "AMF4263", "squawk": "4136", "reg": "N49UC", "flightno": "", "route": "LAN-DFW", "type": "B190", "category": "A1", "altitude": 20000, "heading": 235, "speed": 248, "lat": 38.865905, "lon": -90.429382, "barometer": 0, "vert_rate": 0, "selected_altitude": 0, "polar_distance": 12.99378, "polar_bearing": 345.393951, "is_adsb": true, "is_on_ground": false, "last_seen_time": 1672576769, "pos_update_time": 1672576769, "bds40_seen_time": null } ] }

TriS · Accepted Answer · 2023-01-01 15:00:05Z

This error occurs when we serialize a Java object or deserialize JSON to POJO. The POJO contains new Java 8+ date time classes such as LocalDate, LocalTime, LocalDateTime etc.
Steps:

Add dependency

<dependency> <groupId>com.fasterxml.jackson.datatype</groupId> <artifactId>jackson-datatype-jsr310</artifactId> </dependency>

Register the module JavaTimeModule either with ObjectMapper or JsonMapper

ObjectMapper objectMapper = new ObjectMapper(); objectMapper.registerModule(new JavaTimeModule()); // If JsonMapper is used in application JsonMapper jsonMapper = new JsonMapper(); jsonMapper.registerModule(new JavaTimeModule());

Here you are using Jackson2JsonRedisSerializer in the bean. So you can create the ObjectMapper object and set the JavaTimeModule. After that register the ObjectMapper to the Jackson2JsonRedisSerializer object.

 ObjectMapper objectMapper = new ObjectMapper(); objectMapper.registerModule(new JavaTimeModule()); objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY); objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL); Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class); jackson2JsonRedisSerializer.setObjectMapper(objectMapper);

user2295454 · Accepted Answer · 2023-06-22 15:44:07Z

The setObjectMapper() method of Jackson2JsonRedisSerializer has been deprecated; just put the objectMapper in the constructor:

Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(objectMapper, Object.class);

Collectives™ on Stack Overflow

How to deserialize java.time.Instant in Jackson2JsonRedisSerializer

2 Answers 2

Comments

Comments

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Related