There was an unexpected error (type=Internal Server Error, status=500).
Could not write JSON: Java 8 date/time type `java.time.LocalDateTime` not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling (through reference chain: java.util.ArrayList[0]->Bulletin.Board.domain.posts.Post["createdDate"]); nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Java 8 date/time type `java.time.LocalDateTime` not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling (through reference chain: java.util.ArrayList[0]->Bulletin.Board.domain.posts.Post["createdDate"])
org.springframework.data.redis.serializer.SerializationException: Could not write JSON: Java 8 date/time type `java.time.LocalDateTime` not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling (through reference chain: java.util.ArrayList[0]->Bulletin.Board.domain.posts.Post["createdDate"]); nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Java 8 date/time type `java.time.LocalDateTime` not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling (through reference chain: java.util.ArrayList[0]->Bulletin.Board.domain.posts.Post["createdDate"])
Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Java 8 date/time type `java.time.LocalDateTime` not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling (through reference chain: java.util.ArrayList[0]->Bulletin.Board.domain.posts.Post["createdDate"])
✨ 해결
implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.13.3'먼저, 에러 로그에 나온대로 "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" 모듈을 dependency에 추가했다.
@JsonSerialize(using= LocalDateTimeSerializer.class)
@JsonDeserialize(using= LocalDateTimeDeserializer.class)
private LocalDateTime createdDate;
@JsonSerialize(using= LocalDateTimeSerializer.class)
@JsonDeserialize(using= LocalDateTimeDeserializer.class)
private LocalDateTime modifiedDate;@JsonSerialize와 @JsonDeserialize 어노테이션을 붙였다.
| @JsonSerialize | using = 사용할 Serializer class 지정 getter 메소드 / 필드 / value classes 에 붙인다. 참고) value classes는 value objects라고도 한다. value classes는 값 집합을 가지고 있고, 로직이 거의 없거나 전혀 없는 객체다. DTO가 value object의 예다. |
| @JsonDeserialize | using = 사용할 Deserializer class 지정 setter 메소드 / 필드 / value classes 에 붙인다. |
| LocalDateTimeSerializer | Java 8 임시 LocalDateTimes의 Serializer |
| LocalDateTimeDeserializer | Java 8 임시 LocalDateTimes의 Deserializer |
참고 👇
https://www.quora.com/What-are-value-classes-in-Java
What are value classes in Java?
Answer (1 of 2): The more common term is value objects - it means objects that just hold a set of values, and contain little or no logic. Of course a value object must be an instance of a value class, but since there are (by definition) no logic and no cla
www.quora.com
JsonSerialize (jackson-databind 2.9.0 API)
Whether type detection used is dynamic or static: that is, whether actual runtime type is used (dynamic), or just the declared type (static). Note that Jackson 2.3 changed default to DEFAULT_TYPING, which is roughly same as saying "whatever". This is impor
fasterxml.github.io
JsonDeserialize (jackson-databind 2.8.0 API)
Concrete type to deserialize values as, instead of type otherwise declared. Must be a subtype of declared type; otherwise an exception may be thrown by deserializer. Bogus type Void can be used to indicate that declared type is used as is (i.e. this annota
fasterxml.github.io
LocalDateTimeSerializer (Jackson datatype: JSR310 2.9.0.pr1 API)
void serializeWithType(T value, com.fasterxml.jackson.core.JsonGenerator generator, com.fasterxml.jackson.databind.SerializerProvider provider, com.fasterxml.jackson.databind.jsontype.TypeSerializer serializer)
fasterxml.github.io
LocalDateTimeDeserializer - jackson-datatype-jsr310 2.8.5 javadoc
Latest version of com.fasterxml.jackson.datatype:jackson-datatype-jsr310 https://javadoc.io/doc/com.fasterxml.jackson.datatype/jackson-datatype-jsr310 Current version 2.8.5 https://javadoc.io/doc/com.fasterxml.jackson.datatype/jackson-datatype-jsr310/2.8.5
www.javadoc.io