*hey, what if I want to deserialized the same json which u mentioned in
this post.I have one problem statement on that. Let me know if u have
figure out something*
{"year":2018,"month":
"JULY","monthValue":7,"dayOfMonth":20,"hour":20,"minute":3,"second":33,"nano":653000000,"dayOfWeek":"FRIDAY","dayOfYear":201,"chronology":{"calendarType":"iso8601","id":"ISO"}}
On Saturday, July 21, 2018 at 11:49:26 AM UTC+5:30 Chris C wrote:
> I am using Java 8 and Jackon 2.9.6. I have these jars in my classpath :
>
> j
> ackson-annotations-2.9.6.jar
> jackson-core-2.9.6.jar
> jackson-databind-2.9.6.jar
> jackson-datatype-jdk8-2.9.6.jar
> jackson-datatype-jsr310-2.9.6.jar
>
>
> I have the following classes (trimmed for simplicity) :
>
> @JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, property = "@class")
> public abstract class ContractData {
>
> public String toJSON() {
> try {
> ObjectMapper mapper = new ObjectMapper();
> mapper.registerModule(new Jdk8Module());
> mapper.registerModule(new JavaTimeModule());
>
> return new ObjectMapper().writeValueAsString(this);
> }
> catch (JsonProcessingException ex) {
> throw new IllegalStateException("unable to write data as json"
> , ex);
> }
> }
>
> public static ContractData fromJSON(String json) {
> try {
> ObjectMapper mapper = new ObjectMapper();
> mapper.disable(DeserializationFeature.
> FAIL_ON_UNKNOWN_PROPERTIES);
> mapper.registerModule(new Jdk8Module());
> mapper.registerModule(new JavaTimeModule());
>
> return mapper.readValue(json, ContractData.class);
> }
> catch (IOException ex) {
> throw new IllegalArgumentException("unable to convert json",
> ex);
> }
> }
> }
>
> public final class RegistrationContractData
> extends ContractData
> implements Serializable {
>
> public static final long serialVersionUID = 1L;
>
> private LocalDateTime created;
>
> public RegistrationContractData() { }
>
> public LocalDateTime getCreated() {
> return this.created;
> }
>
> public void setCreated(LocalDateTime created) {
> this.created = created;
> }
> }
>
>
> If I serialize an instance of RegistrationContractData using the toJSON
> method, I get this :
>
> "@class":"mypackage.contracts.data.RegistrationContractData","created":{
> "year":2018,"month":
> "JULY","monthValue":7,"dayOfMonth":20,"hour":20,"minute":3,"second":33,
> "nano":653000000,"dayOfWeek":"FRIDAY","dayOfYear":201,"chronology":{
> "calendarType":"iso8601","id":"ISO"}}}
>
>
> When I try and deserialize the string, I get this exception :
>
> Caused by: com.fasterxml.jackson.databind.exc.MismatchedInputException:
> Expected array or string.
> at [Source: (String)"{"@class":"mypackage.contracts.data.
> RegistrationContractData","created":{"year":2018,"month":"JULY","
> monthValue":7,"dayOfMonth":20,"hour":20,"minute":3,"second":33,"nano
> ":653000000,"dayOfWeek":"FRIDAY","dayOfYear":201,"chronology":{"
> calendarType":"iso8601","id":"ISO"}}}"; line: 1, column: 95] (through
> reference chain: mypackage.contracts.data.RegistrationContractData[
> "created"])
> at com.fasterxml.jackson.databind.exc.MismatchedInputException.
> from(MismatchedInputException.java:63) ~[jackson-databind-2.9.6.jar:2.9.6]
> at com.fasterxml.jackson.databind.DeserializationContext.
> reportInputMismatch(DeserializationContext.java:1342) ~[jackson-databind-
> 2.9.6.jar:2.9.6]
> at com.fasterxml.jackson.databind.DeserializationContext.
> handleUnexpectedToken(DeserializationContext.java:1138) ~[jackson-databind
> -2.9.6.jar:2.9.6]
> at com.fasterxml.jackson.datatype.jsr310.deser.
> JSR310DeserializerBase._handleUnexpectedToken(JSR310DeserializerBase.java:
> 99) ~[jackson-datatype-jsr310-2.9.6.jar:2.9.6]
> at com.fasterxml.jackson.datatype.jsr310.deser.
> LocalDateTimeDeserializer.deserialize(LocalDateTimeDeserializer.java:141)
> ~[jackson-datatype-jsr310-2.9.6.jar:2.9.6]
> at com.fasterxml.jackson.datatype.jsr310.deser.
> LocalDateTimeDeserializer.deserialize(LocalDateTimeDeserializer.java:39)
> ~[jackson-datatype-jsr310-2.9.6.jar:2.9.6]
> at com.fasterxml.jackson.databind.deser.impl.MethodProperty.
> deserializeAndSet(MethodProperty.java:127) ~[jackson-databind-2.9.6.jar:
> 2.9.6]
> at com.fasterxml.jackson.databind.deser.BeanDeserializer.
> vanillaDeserialize(BeanDeserializer.java:288) ~[jackson-databind-2.9.6.jar
> :2.9.6]
> at com.fasterxml.jackson.databind.deser.BeanDeserializer.
> _deserializeOther(BeanDeserializer.java:189) ~[jackson-databind-2.9.6.jar:
> 2.9.6]
> at com.fasterxml.jackson.databind.deser.BeanDeserializer.
> deserialize(BeanDeserializer.java:161) ~[jackson-databind-2.9.6.jar:2.9.6]
> at com.fasterxml.jackson.databind.jsontype.impl.
> AsPropertyTypeDeserializer._deserializeTypedForId(
> AsPropertyTypeDeserializer.java:130) ~[jackson-databind-2.9.6.jar:2.9.6]
> at com.fasterxml.jackson.databind.jsontype.impl.
> AsPropertyTypeDeserializer.deserializeTypedFromObject(
> AsPropertyTypeDeserializer.java:97) ~[jackson-databind-2.9.6.jar:2.9.6]
> at com.fasterxml.jackson.databind.deser.AbstractDeserializer.
> deserializeWithType(AbstractDeserializer.java:254) ~[jackson-databind-2.9.
> 6.jar:2.9.6]
> at com.fasterxml.jackson.databind.deser.impl.
> TypeWrappedDeserializer.deserialize(TypeWrappedDeserializer.java:68) ~[
> jackson-databind-2.9.6.jar:2.9.6]
> at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(
> ObjectMapper.java:4013) ~[jackson-databind-2.9.6.jar:2.9.6]
> at com.fasterxml.jackson.databind.ObjectMapper.readValue(
> ObjectMapper.java:3004) ~[jackson-databind-2.9.6.jar:2.9.6]
> at mypackage.contracts.data.ContractData.fromJSON(ContractData.
> java:36) ~[tx-core.jar:na]
> ... 45 common frames omitted
>
>
> If I instead annotate the LocalDateTime field as
>
> @JsonSerialize(using = LocalDateTimeSerializer.class)
> @JsonDeserialize(using = LocalDateTimeDeserializer.class)
> private LocalDateTime created;
>
>
> I get the following serialized output
>
> {"@class":"mypackage.contracts.data.RegistrationContractData","created":[
> 2018,7,20,20,9,20,938000000]}
>
> which deserializes properly. If I keep the field annotated and remove the
> ObjectMapper.registerModule() calls, it still works. I get the same error
> for a LocalDate as a LocalDateTime. I haven't tried anything specific to
> Java 8+ yet.
>
> From what I could glean off older stack exchange posts I am supposed to
> use ObjectMapper.registerModule with this version instead of the
> annotations. What have I missed? Why is it not deserializing properly?
>
> Thanks
>
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