Spring Boot ignores @JsonDeserialize and @JsonSerialize

问题

I've a Spring Boot application with RESTful endpoints that I want to add custom serializers to for joda-time but I can't get the applications default Jackson serailzier to recognize my custom one's.

I created RESTFul endpoints using @RepositoryRestResource

@RepositoryRestResource(collectionResourceRel = "x", path = "x") 
public interface XRepository extends PagingAndSortingRepository<X, Long>
{
}

I then have a GET call to return all object X's:

http://localhost:8181/x

This is my serializer:

@Component
public class JsonDateSerializer extends JsonSerializer<DateTime>
{

private static DateTimeFormatter formatter = DateTimeFormat.forPattern("dd/MM/yyyy");

@Override
public void serialize(DateTime value, JsonGenerator gen, 
                      SerializerProvider arg2)
    throws IOException, JsonProcessingException {

    gen.writeString(formatter.print(value));
}
}

And I add it to the property Getter as follows:

@JsonSerialize(using=JsonDateSerializer.class)
public DateTime getDateCreated()
{
    return dateCreated;
}

This serializer works perfectly in a normal application but when I try to use this in my Spring Boot application these serializers get ignored.

How can I get Spring Boot to recognize these serializers?

回答1:

Ok so after much torment I found out the answer. I was using the wrong library for the serialization and deserialization of the joda-datetime.

I was using

org.codehaus.jackson

when I should have been using

com.fasterxml.jackson

I guess this is an easy mistake as both libraries have almost identical properties and methods because com.fasterxml.jackson is built on top of org.codehaus.jackson.

Silly mistake looking back now but a valuable lesson learnt to ALWAYS check your using the correct library!!!!

回答2:

With Spring MVC 4.2.1.RELEASE, you need to use the new Jackson2 dependencies as below for the Deserializer to work.

Dont use this

<dependency>  
            <groupId>org.codehaus.jackson</groupId>  
            <artifactId>jackson-mapper-asl</artifactId>  
            <version>1.9.12</version>  
        </dependency>

Use this instead.

<dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.2.2</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.2.2</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.2.2</version>
        </dependency>

Also use com.fasterxml.jackson.databind.JsonDeserializer and com.fasterxml.jackson.databind.annotation.JsonDeserialize for the deserialization and not the classes from org.codehaus.jackson

来源：https://stackoverflow.com/questions/30376714/spring-boot-ignores-jsondeserialize-and-jsonserialize

标签

java

spring-mvc

serialization

spring-boot

jodatime