json - Java 8 LocalDate Jackson format

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Top 5 Answer for json - Java 8 LocalDate Jackson format

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I was never able to get this to work simple using annotations. To get it to work, I created a ContextResolver for ObjectMapper, then I added the JSR310Module (update: now it is JavaTimeModule instead), along with one more caveat, which was the need to set write-date-as-timestamp to false. See more at the documentation for the JSR310 module. Here's an example of what I used.


<dependency>     <groupId>com.fasterxml.jackson.datatype</groupId>     <artifactId>jackson-datatype-jsr310</artifactId>     <version>2.4.0</version> </dependency> 

Note: One problem I faced with this is that the jackson-annotation version pulled in by another dependency, used version 2.3.2, which cancelled out the 2.4 required by the jsr310. What happened was I got a NoClassDefFound for ObjectIdResolver, which is a 2.4 class. So I just needed to line up the included dependency versions


import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.SerializationFeature; import com.fasterxml.jackson.datatype.jsr310.JSR310Module; import javax.ws.rs.ext.ContextResolver; import javax.ws.rs.ext.Provider;  @Provider public class ObjectMapperContextResolver implements ContextResolver<ObjectMapper> {       private final ObjectMapper MAPPER;      public ObjectMapperContextResolver() {         MAPPER = new ObjectMapper();         // Now you should use JavaTimeModule instead         MAPPER.registerModule(new JSR310Module());         MAPPER.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);     }      @Override     public ObjectMapper getContext(Class<?> type) {         return MAPPER;     }   } 

Resource class

@Path("person") public class LocalDateResource {      @GET     @Produces(MediaType.APPLICATION_JSON)     public Response getPerson() {         Person person = new Person();         person.birthDate = LocalDate.now();         return Response.ok(person).build();     }      @POST     @Consumes(MediaType.APPLICATION_JSON)     public Response createPerson(Person person) {         return Response.ok(                 DateTimeFormatter.ISO_DATE.format(person.birthDate)).build();     }      public static class Person {         public LocalDate birthDate;     } } 


curl -v http://localhost:8080/api/person
Result: {"birthDate":"2015-03-01"}

curl -v -POST -H "Content-Type:application/json" -d "{\"birthDate\":\"2015-03-01\"}" http://localhost:8080/api/person
Result: 2015-03-01

See also here for JAXB solution.


The JSR310Module is deprecated as of version 2.7 of Jackson. Instead, you should register the module JavaTimeModule. It is still the same dependency.

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@JsonSerialize and @JsonDeserialize worked fine for me. They eliminate the need to import the additional jsr310 module:

@JsonDeserialize(using = LocalDateDeserializer.class)   @JsonSerialize(using = LocalDateSerializer.class)   private LocalDate dateOfBirth; 


public class LocalDateDeserializer extends StdDeserializer<LocalDate> {      private static final long serialVersionUID = 1L;      protected LocalDateDeserializer() {         super(LocalDate.class);     }       @Override     public LocalDate deserialize(JsonParser jp, DeserializationContext ctxt)             throws IOException, JsonProcessingException {         return LocalDate.parse(jp.readValueAs(String.class));     }  } 


public class LocalDateSerializer extends StdSerializer<LocalDate> {      private static final long serialVersionUID = 1L;      public LocalDateSerializer(){         super(LocalDate.class);     }      @Override     public void serialize(LocalDate value, JsonGenerator gen, SerializerProvider sp) throws IOException, JsonProcessingException {         gen.writeString(value.format(DateTimeFormatter.ISO_LOCAL_DATE));     } } 
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ObjectMapper mapper = new ObjectMapper(); mapper.registerModule(new JavaTimeModule()); mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false); 
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In Spring Boot web app, with Jackson and JSR 310 version "2.8.5"

compile "com.fasterxml.jackson.core:jackson-databind:2.8.5" runtime "com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.8.5" 

The @JsonFormat works:

import com.fasterxml.jackson.annotation.JsonFormat;  @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd") private LocalDate birthDate; 
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The simplest solution (which supports deserialization and serialization as well) is

import com.fasterxml.jackson.annotation.JsonFormat; import com.fasterxml.jackson.databind.annotation.JsonDeserialize; import com.fasterxml.jackson.databind.annotation.JsonSerialize; import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer; import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;  @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "dd/MM/yyyy") @JsonDeserialize(using = LocalDateDeserializer.class) @JsonSerialize(using = LocalDateSerializer.class) private LocalDate dateOfBirth; 

While using the following dependencies in your project.


<dependency>    <groupId>com.fasterxml.jackson.core</groupId>    <artifactId>jackson-databind</artifactId>    <version>2.9.7</version> </dependency> <dependency>    <groupId>com.fasterxml.jackson.datatype</groupId>    <artifactId>jackson-datatype-jsr310</artifactId>    <version>2.9.7</version> </dependency> 


compile "com.fasterxml.jackson.core:jackson-databind:2.9.7" compile "com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.9.7" 

No additional implementation of a ContextResolver, Serializer or Deserializer is required.

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