Package com.fasterxml.jackson.databind

Contains basic mapper (conversion) functionality that allows for converting between regular streaming json content and Java objects (beans or Tree Model: support for both is via ObjectMapper class, as well as convenience methods included in JsonParser

See: Description

Interface Summary

Interface	Description
BeanProperty	Bean properties are logical entities that represent data that Java objects (POJOs (Plain Old Java Objects), sometimes also called "beans") contain; and that are accessed using accessors (methods like getters and setters, fields, constructor parametrers).
JsonSerializable	Interface that can be implemented by objects that know how to serialize themselves to JSON, using JsonGenerator (and SerializerProvider if necessary).
Module.SetupContext	Interface Jackson exposes to modules for purpose of registering extended functionality.

Class Summary

Class	Description
AbstractTypeResolver	Defines interface for resolvers that can resolve abstract types into concrete ones; either by using static mappings, or possibly by materializing implementations dynamically.
AnnotationIntrospector	Abstract class that defines API used for introspecting annotation-based configuration for serialization and deserialization.
AnnotationIntrospector.ReferenceProperty	Value type used with managed and back references; contains type and logic name, used to link related references
BeanDescription	Basic container for information gathered by ClassIntrospector to help in constructing serializers and deserializers.
BeanProperty.Std	Simple stand-alone implementation, useful as a placeholder or base class for more complex implementations.
DatabindContext	Shared base class for DeserializationContext and SerializerProvider, context objects passed through data-binding process.
DeserializationConfig	Object that contains baseline configuration for deserialization process.
DeserializationContext	Context for the process of deserialization a single root-level value.
InjectableValues	Abstract class that defines API for objects that provide value to "inject" during deserialization.
InjectableValues.Std	Simple standard implementation which uses a simple Map to store values to inject, identified by simple String keys.
JavaType	Base class for type token classes used both to contain information and as keys for deserializers.
JsonDeserializer<T>	Abstract class that defines API used by ObjectMapper (and other chained JsonDeserializers too) to deserialize Objects of arbitrary types from JSON, using provided JsonParser.
JsonDeserializer.None	This marker class is only to be used with annotations, to indicate that no deserializer is configured.
JsonMappingException.Reference	Simple bean class used to contain references.
JsonNode	Base class for all JSON nodes, which form the basis of JSON Tree Model that Jackson implements.
JsonSerializer<T>	Abstract class that defines API used by ObjectMapper (and other chained JsonSerializers too) to serialize Objects of arbitrary types into JSON, using provided JsonGenerator.
JsonSerializer.None	This marker class is only to be used with annotations, to indicate that no serializer is configured.
KeyDeserializer	Abstract class that defines API used for deserializing JSON content field names into Java Map keys.
KeyDeserializer.None	This marker class is only to be used with annotations, to indicate that no deserializer is configured.
MappingIterator<T>	Iterator exposed by ObjectMapper when binding sequence of objects.
MappingJsonFactory	Sub-class of JsonFactory that will create a proper ObjectCodec to allow seam-less conversions between JSON content and Java objects (POJOs).
Module	Simple interface for extensions that can be registered with ObjectMapper to provide a well-defined set of extensions to default functionality; such as support for new data types.
ObjectMapper	This mapper (or, data binder, or codec) provides functionality for converting between Java objects (instances of JDK provided core classes, beans), and matching JSON constructs.
ObjectMapper.DefaultTypeResolverBuilder	Customized TypeResolverBuilder that provides type resolver builders used with so-called "default typing" (see ObjectMapper.enableDefaultTyping() for details).
ObjectReader	Builder object that can be used for per-serialization configuration of deserialization parameters, such as root type to use or object to update (instead of constructing new instance).
ObjectWriter	Builder object that can be used for per-serialization configuration of serialization parameters, such as JSON View and root type to use.
ObjectWriter.GeneratorSettings	Helper class used for containing settings specifically related to (re)configuring JsonGenerator constructed for writing output.
ObjectWriter.Prefetch	As a minor optimization, we will make an effort to pre-fetch a serializer, or at least relevant TypeSerializer, if given enough information.
PropertyMetadata	Simple container class used for storing "additional" metadata about properties.
PropertyName	Simple value class used for containing names of properties as defined by annotations (and possibly other configuration sources).
PropertyNamingStrategy	Class that defines how names of JSON properties ("external names") are derived from names of POJO methods and fields ("internal names"), in cases where they are not auto-detected and no explicit annotations exist for naming.
PropertyNamingStrategy.LowerCaseStrategy	Simple strategy where external name simply only uses lower-case characters, and no separators.
PropertyNamingStrategy.LowerCaseWithUnderscoresStrategy	A PropertyNamingStrategy that translates typical camel case Java property names to lower case JSON element names, separated by underscores.
PropertyNamingStrategy.PascalCaseStrategy	A PropertyNamingStrategy that translates typical camelCase Java property names to PascalCase JSON element names (i.e., with a capital first letter).
PropertyNamingStrategy.PropertyNamingStrategyBase
SequenceWriter	Writer class similar to ObjectWriter, except that it can be used for writing sequences of values, not just a single value.
SerializationConfig	Object that contains baseline configuration for serialization process.
SerializerProvider	Class that defines API used by ObjectMapper and JsonSerializers to obtain serializers capable of serializing instances of specific types; as well as the default implementation of the functionality.

Enum Summary

Enum	Description
AnnotationIntrospector.ReferenceProperty.Type
DeserializationFeature	Enumeration that defines simple on/off features that affect the way Java objects are deserialized from JSON
MapperFeature	Enumeration that defines simple on/off features to set for ObjectMapper, and accessible (but not changeable) via ObjectReader and ObjectWriter (as well as through various convenience methods through context objects).
ObjectMapper.DefaultTyping	Enumeration used with ObjectMapper.enableDefaultTyping() to specify what kind of types (classes) default typing should be used for.
SerializationFeature	Enumeration that defines simple on/off features that affect the way Java objects are serialized.

Exception Summary

Exception	Description
JsonMappingException	Checked exception used to signal fatal problems with mapping of content.
RuntimeJsonMappingException	Wrapper used when interface does not allow throwing a checked JsonMappingException

Package com.fasterxml.jackson.databind Description

Contains basic mapper (conversion) functionality that allows for converting between regular streaming json content and Java objects (beans or Tree Model: support for both is via ObjectMapper class, as well as convenience methods included in JsonParser

Object mapper will convert Json content to ant from basic Java wrapper types (Integer, Boolean, Double), Collection types (List, Map), Java Beans, Strings and nulls.

Tree mapper builds dynamically typed tree of JsonNodes from JSON content (and writes such trees as JSON), similar to how DOM model works with XML. Main benefits over Object mapping are:

• No null checks are needed (dummy nodes are created as necessary to represent "missing" Object fields and Array elements)
• No type casts are usually needed: all public access methods are defined in basic JsonNode class, and when "incompatible" method (such as Array element access on, say, Boolean node) is used, returned node is virtual "missing" node.

Because of its dynamic nature, Tree mapping is often convenient for basic path access and tree navigation, where structure of the resulting tree is known in advance.