## Uses of Class
com.fasterxml.jackson.databind.type.ClassKey

Packages that use ClassKey
com.fasterxml.jackson.databind.deser: Contains implementation classes of deserialization part of data binding.
com.fasterxml.jackson.databind.introspect: Functionality needed for Bean introspection, required for detecting accessors and mutators for Beans, as well as locating and handling method annotations.
com.fasterxml.jackson.databind.module: Package that contains classes and interfaces to help implement custom extension `Module`s (which are registered using `ObjectMapper.registerModule(com.fasterxml.jackson.databind.Module)`.
com.fasterxml.jackson.databind.type: Package that contains concrete implementations of `JavaType`, as well as the factory (`TypeFactory`) for constructing instances from various input data types (like `Class`, `Type`) and programmatically (for structured types, arrays, `List`s and `Map`s).
com.fasterxml.jackson.databind.util: Utility classes for Mapper package.

### Uses of ClassKey in com.fasterxml.jackson.databind.deser

Fields in com.fasterxml.jackson.databind.deser with type parameters of type ClassKey
`protected HashMap<ClassKey,JsonDeserializer<Object>>` BeanDeserializerBase.`_subDeserializers` Lazily constructed map used to contain deserializers needed for polymorphic subtypes.

### Uses of ClassKey in com.fasterxml.jackson.databind.introspect

Fields in com.fasterxml.jackson.databind.introspect with type parameters of type ClassKey
`protected Map<ClassKey,Class<?>>` SimpleMixInResolver.`_localMixIns` Simple mix-in targets defined locally.

Constructor parameters in com.fasterxml.jackson.databind.introspect with type arguments of type ClassKey
Constructor and Description
`SimpleMixInResolver(ClassIntrospector.MixInResolver overrides, Map<ClassKey,Class<?>> mixins)`

### Uses of ClassKey in com.fasterxml.jackson.databind.module

Fields in com.fasterxml.jackson.databind.module with type parameters of type ClassKey
`protected HashMap<ClassKey,ValueInstantiator>` SimpleValueInstantiators.`_classMappings` Mappings from raw (type-erased, i.e.
`protected HashMap<ClassKey,JsonSerializer<?>>` SimpleSerializers.`_classMappings` Class-based mappings that are used both for exact and sub-class matches.
`protected HashMap<ClassKey,KeyDeserializer>` SimpleKeyDeserializers.`_classMappings`
`protected HashMap<ClassKey,JsonDeserializer<?>>` SimpleDeserializers.`_classMappings`
`protected HashMap<ClassKey,JsonSerializer<?>>` SimpleSerializers.`_interfaceMappings` Interface-based matches.
`protected HashMap<ClassKey,Class<?>>` SimpleAbstractTypeResolver.`_mappings` Mappings from super types to subtypes

Methods in com.fasterxml.jackson.databind.module with parameters of type ClassKey
`protected JsonSerializer<?>` SimpleSerializers.`_findInterfaceMapping(Class<?> cls, ClassKey key)`

### Uses of ClassKey in com.fasterxml.jackson.databind.type

Methods in com.fasterxml.jackson.databind.type with parameters of type ClassKey
`int` ClassKey.`compareTo(ClassKey other)`

### Uses of ClassKey in com.fasterxml.jackson.databind.util

Fields in com.fasterxml.jackson.databind.util with type parameters of type ClassKey
`protected LRUMap<ClassKey,PropertyName>` RootNameLookup.`_rootNames` For efficient operation, let's try to minimize number of times we need to introspect root element name to use.