@Target(value={ANNOTATION_TYPE,METHOD,CONSTRUCTOR}) @Retention(value=RUNTIME) public @interface JsonCreator
NOTE: when annotating creator methods (constructors, factory methods), method must either be:
JsonProperty
annotation for the argument: if so, this is so-called "delegate creator",
in which case Jackson first binds JSON into type of the argument, and
then calls creator. This is often used in conjunction with JsonValue
(used for serialization).
JsonProperty
or JacksonInject
, to indicate name
of property to bind to
JsonProperty
annotations must specify actual name
(NOT empty String for "default") unless you use one of extension modules
that can detect parameter name; this because default JDK versions before 8
have not been able to store and/or retrieve parameter names from bytecode.
But with JDK 8 (or using helper libraries such as Paranamer, or other JVM
languages like Scala or Kotlin), specifying name is optional.
One common use case is to use a delegating Creator to construct instances from
scalar values (like java.lang.String
) during deserialization,
and serialize values using JsonValue
.
NOTE: As of Jackson 2.6, use of JsonProperty.required()
is supported
for Creator methods (but not necessarily for regular setters or fields!).
JsonCreator
Modifier and Type | Optional Element and Description |
---|---|
JsonCreator.Mode |
mode
Property that is used to indicate how argument(s) is/are bound for creator,
in cases there may be multiple alternatives.
|
public abstract JsonCreator.Mode mode
JsonCreator.Mode
for more complete explanation of possible choices.
Default value of JsonCreator.Mode.DEFAULT
means that caller is to use standard
heuristics for choosing mode to use.
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