com.fasterxml.jackson.annotation

Annotation Type JsonProperty

@Target(value={ANNOTATION_TYPE,FIELD,METHOD,PARAMETER})
 @Retention(value=RUNTIME)
public @interface 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.

Default value ("") indicates that the field name is used as the property name without any modifications, but it can be specified to non-empty value to specify different name. Property name refers to name used externally, as the field name in JSON objects.

Field Summary

Fields

Modifier and Type	Fields and Description
static int	INDEX_UNKNOWN Marker value used to indicate that no index has been specified.
static String	USE_DEFAULT_NAME Special value that indicates that handlers should use the default name (derived from method or field name) for property.

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
String	defaultValue Property that may be used to document expected default value for the property: most often used as source information for generating schemas (like JSON Schema or protobuf/thrift schema), or documentation.
int	index Property that indicates numerical index of this property (relative to other properties specified for the Object).
boolean	required Property that indicates whether a value (which may be explicit null) is expected for property during deserialization or not.
String	value Defines name of the logical property, i.e.

Field Detail

USE_DEFAULT_NAME

public static final String USE_DEFAULT_NAME

Special value that indicates that handlers should use the default name (derived from method or field name) for property.

Since:

2.1

INDEX_UNKNOWN

public static final int INDEX_UNKNOWN

Marker value used to indicate that no index has been specified. Used as the default value as annotations do not allow "missing" values.

Since:

2.4

Element Detail

value

public abstract String value

Defines name of the logical property, i.e. JSON object field name to use for the property. If value is empty String (which is the default), will try to use name of the field that is annotated. Note that there is no default name available for constructor arguments, meaning that Empty String is not a valid value for constructor arguments.

Default:

""

required

public abstract boolean required

Property that indicates whether a value (which may be explicit null) is expected for property during deserialization or not. If expected, BeanDeserialized should indicate this as a validity problem (usually by throwing an exception, but this may be sent via problem handlers that can try to rectify the problem, for example, by supplying a default value).

Note that as of 2.0, this property is NOT used by BeanDeserializer: support is expected to be added for a later minor version.

Since:

2.0

Default:

false

index

public abstract int index

Property that indicates numerical index of this property (relative to other properties specified for the Object). This index is typically used by binary formats, but may also be useful for schema languages and other tools.

Since:

2.4

Default:

-1

defaultValue

public abstract String defaultValue

Property that may be used to document expected default value for the property: most often used as source information for generating schemas (like JSON Schema or protobuf/thrift schema), or documentation. It may also be used by Jackson extension modules; core jackson databind does not have any automated handling beyond simply exposing this value through bean property introspection.

Since:

2.5

Default:

""