# Package com.fasterxml.jackson.annotation

Public core annotations, most of which are used to configure how Data Mapping/Binding works.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  JacksonAnnotationValue<A extends java.lang.annotation.Annotation> | Marker interface used by value classes like `JsonFormat.Value` that are used to contain information from one of Jackson annotations, and can be directly instantiated from those annotations, as well as programmatically constructed and possibly merged.
  ObjectIdResolver | Definition of API used for resolving actual Java object from Object Identifiers (as annotated using `JsonIdentityInfo`).

- Class Summary
  Class | Description
  --- | ---
  JsonFormat.Features | Helper class that encapsulates information equivalent to `Boolean` valued `EnumMap`.
  JsonFormat.Value | Helper class used to contain information from a single `JsonFormat` annotation.
  JsonIgnoreProperties.Value | Helper class used to contain information from a single `JsonIgnoreProperties` annotation, as well as to provide possible overrides from non-annotation sources.
  JsonInclude.Value | Helper class used to contain information from a single `JsonInclude` annotation.
  JsonTypeInfo.None | Deprecated Since 2.5, use any Annotation type (such as `JsonTypeInfo`, if such behavior is needed; this is rarely necessary.
  ObjectIdGenerator<T> | Definition of API used for constructing Object Identifiers (as annotated using `JsonIdentityInfo`).
  ObjectIdGenerator.IdKey | Simple key class that can be used as a key for ObjectId-to-POJO mappings, when multiple ObjectId types and scopes are used.
  ObjectIdGenerators | Container class for standard `ObjectIdGenerator` implementations: `ObjectIdGenerators.IntSequenceGenerator` `ObjectIdGenerators.PropertyGenerator` `ObjectIdGenerators.StringIdGenerator` (since 2.7) `ObjectIdGenerators.UUIDGenerator`
  ObjectIdGenerators.IntSequenceGenerator | Simple sequence-number based generator, which uses basic Java `int`s (starting with value 1) as Object Identifiers.
  ObjectIdGenerators.None | Abstract marker class used to allow explicitly specifying that no generator is used; which also implies that no Object Id is to be included or used.
  ObjectIdGenerators.PropertyGenerator | Abstract place-holder class which is used to denote case where Object Identifier to use comes from a POJO property (getter method or field).
  ObjectIdGenerators.StringIdGenerator | Implementation that will accept arbitrary (but unique) String Ids on deserialization, and (by default) use random UUID generation similar to `ObjectIdGenerators.UUIDGenerator` for generation ids.
  ObjectIdGenerators.UUIDGenerator | Implementation that just uses `UUID`s as reliably unique identifiers: downside is that resulting String is 36 characters long.
  SimpleObjectIdResolver | Simple implementation of `ObjectIdResolver`

- Enum Summary
  Enum | Description
  --- | ---
  JsonAutoDetect.Visibility | Enumeration for possible visibility thresholds (minimum visibility) that can be used to limit which methods (and fields) are auto-detected.
  JsonCreator.Mode |
  JsonFormat.Feature | Set of features that can be enabled/disabled for property annotated.
  JsonFormat.Shape | Value enumeration used for indicating preferred Shape; translates loosely to JSON types, with some extra values to indicate less precise choices (i.e.
  JsonInclude.Include | Enumeration used with `JsonInclude` to define which properties of Java Beans are to be included in serialization.
  JsonProperty.Access | Various options for `JsonProperty.access()` property, specifying how property may be accessed during serialization ("read") and deserialization ("write") (note that the direction of read and write is from perspective of the property, not from external data format: this may be confusing in some contexts).
  JsonTypeInfo.As | Definition of standard type inclusion mechanisms for type metadata.
  JsonTypeInfo.Id | Definition of different type identifiers that can be included in JSON during serialization, and used for deserialization.
  OptBoolean | Optional Boolean value ("nullean").
  PropertyAccessor | Enumeration used to define kinds of elements (called "property accessors") that annotations like `JsonAutoDetect` apply to.

- Annotation Types Summary
  Annotation Type | Description
  --- | ---
  JacksonAnnotation | Meta-annotation (annotations used on other annotations) used for marking all annotations that are part of Jackson package.
  JacksonAnnotationsInside | Meta-annotation (annotations used on other annotations) used for indicating that instead of using target annotation (annotation annotated with this annotation), Jackson should use meta-annotations it has.
  JacksonInject | Jackson-specific annotation used for indicating that value of annotated property will be "injected", i.e.
  JsonAnyGetter | Marker annotation that can be used to define a non-static, no-argument method or member field as something of a reverse of `JsonAnySetter` method; basically being used like a getter but such that contents of the returned Map (type must be `Map`) are serialized as if they were actual properties of the bean that contains method/field with this annotations.
  JsonAnySetter | Marker annotation that can be used to define a non-static, two-argument method (first argument name of property, second value to set), to be used as a "fallback" handler for all otherwise unrecognized properties found from JSON content.
  JsonAutoDetect | Class annotation that can be used to define which kinds of Methods are to be detected by auto-detection, and with what minimum access level.
  JsonBackReference | Annotation used to indicate that associated property is part of two-way linkage between fields; and that its role is "child" (or "back") link.
  JsonClassDescription | Annotation used to define a human readable description for annotated type (class).
  JsonCreator | Marker annotation that can be used to define constructors and factory methods as one to use for instantiating new instances of the associated class.
  JsonEnumDefaultValue | Marker annotation that can be used to define a default value used when trying to deserialize unknown Enum values.
  JsonFilter | Annotation used to indicate which logical filter is to be used for filtering out properties of type (class) annotated; association made by this annotation declaring ids of filters, and `com.fasterxml.jackson.databind.ObjectMapper` (or objects it delegates to) providing matching filters by id.
  JsonFormat | General-purpose annotation used for configuring details of how values of properties are to be serialized.
  JsonGetter | Marker annotation that can be used to define a non-static, no-argument value-returning (non-void) method to be used as a "getter" for a logical property.
  JsonIdentityInfo | Annotation used for indicating that values of annotated type or property should be serializing so that instances either contain additional object identifier (in addition actual object properties), or as a reference that consists of an object id that refers to a full serialization.
  JsonIdentityReference | Optional annotation that can be used for customizing details of a reference to Objects for which "Object Identity" is enabled (see `JsonIdentityInfo`).
  JsonIgnore | Marker annotation that indicates that the annotated method or field is to be ignored by introspection-based serialization and deserialization functionality.
  JsonIgnoreProperties | Annotation that can be used to either suppress serialization of properties (during serialization), or ignore processing of JSON properties read (during deserialization).
  JsonIgnoreType | Marker annotation that indicates that all properties of annotated type are to be ignored during serialization and deserialization.
  JsonInclude | Annotation used to indicate when value of the annotated property (when used for a field, method or constructor parameter), or all properties of the annotated class, is to be serialized.
  JsonManagedReference | Annotation used to indicate that annotated property is part of two-way linkage between fields; and that its role is "parent" (or "forward") link.
  JsonProperty | Marker annotation that can be used to define a non-static method as a "setter" or "getter" for a logical property (depending on its signature), or non-static object field to be used (serialized, deserialized) as a logical property.
  JsonPropertyDescription | Annotation used to define a human readable description for a logical property.
  JsonPropertyOrder | Annotation that can be used to define ordering (possibly partial) to use when serializing object properties.
  JsonRawValue | Marker annotation that indicates that the annotated method or field should be serialized by including literal String value of the property as is, without quoting of characters.
  JsonRootName | Annotation similar to `javax.xml.bind.annotation.XmlRootElement`, used to indicate name to use for root-level wrapping, if wrapping is enabled.
  JsonSetter | Marker annotation that can be used to define a non-static, single-argument method to be used as a "setter" for a logical property as an alternative to recommended `JsonProperty` annotation (which was introduced in version 1.1).
  JsonSubTypes | Annotation used with `JsonTypeInfo` to indicate sub types of serializable polymorphic types, and to associate logical names used within JSON content (which is more portable than using physical Java class names).
  JsonSubTypes.Type | Definition of a subtype, along with optional name.
  JsonTypeId | Marker annotation that can be used on a property accessor (field, getter or setter, constructor parameter) to indicate that the property is to contain type id to use when including polymorphic type information.
  JsonTypeInfo | Annotation used for configuring details of if and how type information is used with JSON serialization and deserialization, to preserve information about actual class of Object instances.
  JsonTypeName | Annotation used for binding logical name that the annotated class has.
  JsonUnwrapped | Annotation used to indicate that a property should be serialized "unwrapped"; that is, if it would be serialized as JSON Object, its properties are instead included as properties of its containing Object.
  JsonValue | Marker annotation similar to `javax.xml.bind.annotation.XmlValue` that indicates that results of the annotated "getter" method (which means signature must be that of getters; non-void return type, no args) is to be used as the single value to serialize for the instance.
  JsonView | Annotation used for indicating view(s) that the property that is defined by method or field annotated is part of.

## Package com.fasterxml.jackson.annotation Description

Public core annotations, most of which are used to configure how Data Mapping/Binding works. Annotations in this package can only have dependencies to non-annotation classes in Core package; annotations that have dependencies to Mapper classes are included in Mapper module (under `org.codehaus.jackson.map.annotate`). Also contains parameter types (mostly enums) needed by annotations.

Note that prior versions (1.x) contained these annotations within 'core' jar, as part of Streaming API.