As of Jackson 2.6, there is a way, but it does not work on class attribute annotations, only constructor annotations: /* DOES *NOT* THROW IF bar MISSING */ public class Foo { @JsonProperty(value = “bar”, required = true) public int bar; } /* DOES THROW IF bar MISSING */ public class Foo { public int … Read more
ArrayNode implements Iterable. Iterable has a spliterator() method. You can create a sequential Stream from a Spliterator using ArrayNode arrayNode = (ArrayNode) json.get(“xyz”); StreamSupport.stream(arrayNode.spliterator(), false)
I believe this has been resolved and nowadays you can write it like this: import com.fasterxml.jackson.annotation.JsonSubTypes import com.fasterxml.jackson.annotation.JsonTypeInfo @JsonTypeInfo( use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = “type”) @JsonSubTypes( JsonSubTypes.Type(value = Comment::class, name = “CommentNote”), JsonSubTypes.Type(value = Photo::class, name = “PhotoNote”), JsonSubTypes.Type(value = Document::class, name = “DocumentNote”)) interface Note Note the missing @ and class … Read more
As already mentioned, Jackson-Datatype-JSR310 provides support for Java 8 Time. Since Jackson 2.6.0 the “old” JSR310Module is deprecated. It is replaced by JavaTimeModule. Maven dependency is the same (you can find the current version in Maven Central): <dependency> <groupId>com.fasterxml.jackson.datatype</groupId> <artifactId>jackson-datatype-jsr310</artifactId> <version>2.6.0</version> </dependency> You have to register the module like this: ObjectMapper mapper = new ObjectMapper(); … Read more
There’s no need to use custom serializers/deserializers here. Use jackson-modules-java8’s datetime module: Datatype module to make Jackson recognize Java 8 Date & Time API data types (JSR-310). This module adds support for quite a few classes: Duration Instant LocalDateTime LocalDate LocalTime MonthDay OffsetDateTime OffsetTime Period Year YearMonth ZonedDateTime ZoneId ZoneOffset