MapperFeature (jackson-databind 2.15.2 API)

java.lang.Object
- java.lang.Enum<MapperFeature>
- - com.fasterxml.jackson.databind.MapperFeature

All Implemented Interfaces:

ConfigFeature, Serializable, Comparable<MapperFeature>
```
public enum MapperFeature
extends Enum<MapperFeature>
implements ConfigFeature
```
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).
Note that in addition to being only mutable via ObjectMapper, changes only take effect when done before any serialization or deserialization calls -- that is, caller must follow "configure-then-use" pattern.

Enum Constant Summary

Enum Constants
Enum Constant and Description
`ACCEPT_CASE_INSENSITIVE_ENUMS` Feature that determines if Enum deserialization should be case sensitive or not.
`ACCEPT_CASE_INSENSITIVE_PROPERTIES` Feature that will allow for more forgiving deserialization of incoming JSON.
`ACCEPT_CASE_INSENSITIVE_VALUES` Feature that permits parsing some enumerated text-based value types but ignoring the case of the values on deserialization: for example, date/time type deserializers.
`ALLOW_COERCION_OF_SCALARS` Feature that determines whether coercions from secondary representations are allowed for simple non-textual scalar types: numbers and booleans.
`ALLOW_EXPLICIT_PROPERTY_RENAMING` Feature that when enabled will allow explicitly named properties (i.e., fields or methods annotated with `JsonProperty`("explicitName")) to be re-named by a `PropertyNamingStrategy`, if one is configured.
`ALLOW_FINAL_FIELDS_AS_MUTATORS` Feature that determines whether member fields declared as 'final' may be auto-detected to be used mutators (used to change value of the logical property) or not.
`ALLOW_IS_GETTERS_FOR_NON_BOOLEAN` Feature that when enabled will allow getters with is-Prefix also for non-boolean return types; if disabled only methods that return `boolean` or `Boolean` qualify as "is getters".
`ALLOW_VOID_VALUED_PROPERTIES` Feature that determines whether nominal property type of `Void` is allowed for Getter methods to indicate `null` valued pseudo-property or not.
`APPLY_DEFAULT_VALUES` Feature that determines whether `ObjectReader` applies default values defined in class definitions in cases where the input data omits the relevant values.
`AUTO_DETECT_CREATORS` Feature that determines whether "creator" methods are automatically detected by consider public constructors, and static single argument methods with name "valueOf".
`AUTO_DETECT_FIELDS` Feature that determines whether non-static fields are recognized as properties.
`AUTO_DETECT_GETTERS` Feature that determines whether regular "getter" methods are automatically detected based on standard Bean naming convention or not.
`AUTO_DETECT_IS_GETTERS` Feature that determines whether "is getter" methods are automatically detected based on standard Bean naming convention or not.
`AUTO_DETECT_SETTERS` Feature that determines whether "setter" methods are automatically detected based on standard Bean naming convention or not.
`BLOCK_UNSAFE_POLYMORPHIC_BASE_TYPES` Setting that may be enabled to reconfigure default `PolymorphicTypeValidator` used by legacy `ObjectMapper.enableDefaultTyping()` methods as well as default used for annotation-based polymorphic handling so that it uses `DefaultBaseTypeLimitingValidator`.
`CAN_OVERRIDE_ACCESS_MODIFIERS` Feature that determines whether method and field access modifier settings can be overridden when accessing properties.
`DEFAULT_VIEW_INCLUSION` Feature that determines whether properties that have no view annotations are included in JSON serialization views (see `JsonView` for more details on JSON Views).
`IGNORE_DUPLICATE_MODULE_REGISTRATIONS` Feature that determines whether multiple registrations of same module should be ignored or not; if enabled, only the first registration call results in module being called, and possible duplicate calls are silently ignored; if disabled, no checking is done and all registration calls are dispatched to module.
`IGNORE_MERGE_FOR_UNMERGEABLE` Setting that determines what happens if an attempt is made to explicitly "merge" value of a property, where value does not support merging; either merging is skipped and new value is created (`true`) or an exception is thrown (false).
`INFER_BUILDER_TYPE_BINDINGS` Feature that enables inferring builder type bindings from the value type being deserialized.
`INFER_CREATOR_FROM_CONSTRUCTOR_PROPERTIES` Feature that determines handling of `java.beans.ConstructorProperties` annotation: when enabled, it is considered as alias of `JsonCreator`, to mean that constructor should be considered a property-based Creator; when disabled, only constructor parameter name information is used, but constructor is NOT considered an explicit Creator (although may be discovered as one using other annotations or heuristics).
`INFER_PROPERTY_MUTATORS` Feature that determines whether member mutators (fields and setters) may be "pulled in" even if they are not visible, as long as there is a visible accessor (getter or field) with same name.
`OVERRIDE_PUBLIC_ACCESS_MODIFIERS` Feature that determines that forces call to `AccessibleObject.setAccessible(java.lang.reflect.AccessibleObject[], boolean)` even for `public` accessors -- that is, even if no such call is needed from functionality perspective -- if call is allowed (that is, `CAN_OVERRIDE_ACCESS_MODIFIERS` is set to true).
`PROPAGATE_TRANSIENT_MARKER` Feature that determines how `transient` modifier for fields is handled: if disabled, it is only taken to mean exclusion of the field as an accessor; if true, it is taken to imply removal of the whole property.
`REQUIRE_SETTERS_FOR_GETTERS` Feature that determines whether getters (getter methods) can be auto-detected if there is no matching mutator (setter, constructor parameter or field) or not: if set to true, only getters that match a mutator are auto-discovered; if false, all auto-detectable getters can be discovered.
`REQUIRE_TYPE_ID_FOR_SUBTYPES` Feature that determines what happens when deserializing to a registered sub-type (polymorphic deserialization), but no type information has been provided.
`SORT_CREATOR_PROPERTIES_FIRST` Feature that defines whether Creator properties (ones passed through constructor or static factory method) should be sorted before other properties for which no explicit order is specified, in case where alphabetic ordering is to be used for such properties.
`SORT_PROPERTIES_ALPHABETICALLY` Feature that defines default property serialization order used for POJO properties.
`USE_ANNOTATIONS` Feature that determines whether annotation introspection is used for configuration; if enabled, configured `AnnotationIntrospector` will be used: if disabled, no annotations are considered.
`USE_BASE_TYPE_AS_DEFAULT_IMPL` Feature that specifies whether the declared base type of a polymorphic value is to be used as the "default" implementation, if no explicit default class is specified via `@JsonTypeInfo.defaultImpl` annotation.
`USE_GETTERS_AS_SETTERS` Feature that determines whether otherwise regular "getter" methods (but only ones that handle Collections and Maps, not getters of other type) can be used for purpose of getting a reference to a Collection and Map to modify the property, without requiring a setter method.
`USE_STATIC_TYPING` Feature that determines whether the type detection for serialization should be using actual dynamic runtime type, or declared static type.
`USE_STD_BEAN_NAMING` Feature that may be enabled to enforce strict compatibility with Bean name introspection, instead of slightly different mechanism Jackson defaults to.
`USE_WRAPPER_NAME_AS_PROPERTY_NAME` Feature that can be enabled to make property names be overridden by wrapper name (usually detected with annotations as defined by `AnnotationIntrospector.findWrapperName(com.fasterxml.jackson.databind.introspect.Annotated)`.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`static long`	`collectLongDefaults()`
`boolean`	`enabledByDefault()` Accessor for checking whether this feature is enabled by default.
`boolean`	`enabledIn(int flags)` Deprecated.
`boolean`	`enabledIn(long flags)`
`long`	`getLongMask()`
`int`	`getMask()` Deprecated.
`static MapperFeature`	`valueOf(String name)` Returns the enum constant of this type with the specified name.
`static MapperFeature[]`	`values()` Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- Enum Constant Detail
  - USE_ANNOTATIONS
```
public static final MapperFeature USE_ANNOTATIONS
```
    Feature that determines whether annotation introspection is used for configuration; if enabled, configured AnnotationIntrospector will be used: if disabled, no annotations are considered.
    Feature is enabled by default.
  - USE_GETTERS_AS_SETTERS
```
public static final MapperFeature USE_GETTERS_AS_SETTERS
```
    Feature that determines whether otherwise regular "getter" methods (but only ones that handle Collections and Maps, not getters of other type) can be used for purpose of getting a reference to a Collection and Map to modify the property, without requiring a setter method. This is similar to how JAXB framework sets Collections and Maps: no setter is involved, just setter.
    Note that such getters-as-setters methods have lower precedence than setters, so they are only used if no setter is found for the Map/Collection property.
    Feature is enabled by default.
  - PROPAGATE_TRANSIENT_MARKER
```
public static final MapperFeature PROPAGATE_TRANSIENT_MARKER
```
    Feature that determines how transient modifier for fields is handled: if disabled, it is only taken to mean exclusion of the field as an accessor; if true, it is taken to imply removal of the whole property.
    Feature is disabled by default, meaning that existence of `transient` for a field does not necessarily lead to ignoral of getters or setters but just ignoring the use of field for access.
    
    Since:
    
    2.6
  - AUTO_DETECT_CREATORS
```
public static final MapperFeature AUTO_DETECT_CREATORS
```
    Feature that determines whether "creator" methods are automatically detected by consider public constructors, and static single argument methods with name "valueOf". If disabled, only methods explicitly annotated are considered creator methods (except for the no-arg default constructor which is always considered a factory method).
    Note that this feature has lower precedence than per-class annotations, and is only used if there isn't more granular configuration available.
    Feature is enabled by default.
  - AUTO_DETECT_FIELDS
```
public static final MapperFeature AUTO_DETECT_FIELDS
```
    Feature that determines whether non-static fields are recognized as properties. If yes, then all public member fields are considered as properties. If disabled, only fields explicitly annotated are considered property fields.
    Note that this feature has lower precedence than per-class annotations, and is only used if there isn't more granular configuration available.
    Feature is enabled by default.
  - AUTO_DETECT_GETTERS
```
public static final MapperFeature AUTO_DETECT_GETTERS
```
    Feature that determines whether regular "getter" methods are automatically detected based on standard Bean naming convention or not. If yes, then all public zero-argument methods that start with prefix "get" are considered as getters. If disabled, only methods explicitly annotated are considered getters.
    Note that since version 1.3, this does NOT include "is getters" (see AUTO_DETECT_IS_GETTERS for details)
    Note that this feature has lower precedence than per-class annotations, and is only used if there isn't more granular configuration available.
    Feature is enabled by default.
  - AUTO_DETECT_IS_GETTERS
```
public static final MapperFeature AUTO_DETECT_IS_GETTERS
```
    Feature that determines whether "is getter" methods are automatically detected based on standard Bean naming convention or not. If yes, then all public zero-argument methods that start with prefix "is", and whose return type is boolean are considered as "is getters". If disabled, only methods explicitly annotated are considered getters.
    Note that this feature has lower precedence than per-class annotations, and is only used if there isn't more granular configuration available.
    Feature is enabled by default.
  - AUTO_DETECT_SETTERS
```
public static final MapperFeature AUTO_DETECT_SETTERS
```
    Feature that determines whether "setter" methods are automatically detected based on standard Bean naming convention or not. If yes, then all public one-argument methods that start with prefix "set" are considered setters. If disabled, only methods explicitly annotated are considered setters.
    Note that this feature has lower precedence than per-class annotations, and is only used if there isn't more granular configuration available.
    Feature is enabled by default.
  - REQUIRE_SETTERS_FOR_GETTERS
```
public static final MapperFeature REQUIRE_SETTERS_FOR_GETTERS
```
    Feature that determines whether getters (getter methods) can be auto-detected if there is no matching mutator (setter, constructor parameter or field) or not: if set to true, only getters that match a mutator are auto-discovered; if false, all auto-detectable getters can be discovered.
    Feature is disabled by default.
  - ALLOW_FINAL_FIELDS_AS_MUTATORS
```
public static final MapperFeature ALLOW_FINAL_FIELDS_AS_MUTATORS
```
    Feature that determines whether member fields declared as 'final' may be auto-detected to be used mutators (used to change value of the logical property) or not. If enabled, 'final' access modifier has no effect, and such fields may be detected according to usual visibility and inference rules; if disabled, such fields are NOT used as mutators except if explicitly annotated for such use.
    Feature is enabled by default, for backwards compatibility reasons.
    
    Since:
    
    2.2
  - INFER_PROPERTY_MUTATORS
```
public static final MapperFeature INFER_PROPERTY_MUTATORS
```
    Feature that determines whether member mutators (fields and setters) may be "pulled in" even if they are not visible, as long as there is a visible accessor (getter or field) with same name. For example: field "value" may be inferred as mutator, if there is visible or explicitly marked getter "getValue()". If enabled, inferring is enabled; otherwise (disabled) only visible and explicitly annotated accessors are ever used.
    Note that 'getters' are never inferred and need to be either visible (including bean-style naming) or explicitly annotated.
    Feature is enabled by default.
    
    Since:
    
    2.2
  - INFER_CREATOR_FROM_CONSTRUCTOR_PROPERTIES
```
public static final MapperFeature INFER_CREATOR_FROM_CONSTRUCTOR_PROPERTIES
```
    Feature that determines handling of java.beans.ConstructorProperties annotation: when enabled, it is considered as alias of JsonCreator, to mean that constructor should be considered a property-based Creator; when disabled, only constructor parameter name information is used, but constructor is NOT considered an explicit Creator (although may be discovered as one using other annotations or heuristics).
    Feature is mostly used to help inter-operability with frameworks like Lombok that may automatically generate ConstructorProperties annotation but without necessarily meaning that constructor should be used as Creator for deserialization.
    Feature is enabled by default.
    
    Since:
    
    2.9
  - ALLOW_VOID_VALUED_PROPERTIES
```
public static final MapperFeature ALLOW_VOID_VALUED_PROPERTIES
```
    Feature that determines whether nominal property type of Void is allowed for Getter methods to indicate null valued pseudo-property or not. If enabled, such properties are recognized (see [databind#2675] for reasons -- mostly things related to frameworks, code generation); if disabled, such property accessors (or at least getters) are ignored.
    Feature is disabled by default (in 2.12) for backwards compatibility.
    
    Since:
    
    2.12
  - CAN_OVERRIDE_ACCESS_MODIFIERS
```
public static final MapperFeature CAN_OVERRIDE_ACCESS_MODIFIERS
```
    Feature that determines whether method and field access modifier settings can be overridden when accessing properties. If enabled, method AccessibleObject.setAccessible(java.lang.reflect.AccessibleObject[], boolean) may be called to enable access to otherwise unaccessible objects.
    Note that this setting may have significant performance implications, since access override helps remove costly access checks on each and every Reflection access. If you are considering disabling this feature, be sure to verify performance consequences if usage is performance sensitive. Also note that performance effects vary between Java platforms (JavaSE vs Android, for example), as well as JDK versions: older versions seemed to have more significant performance difference.
    Conversely, on some platforms, it may be necessary to disable this feature as platform does not allow such calls. For example, when developing Applets (or other Java code that runs on tightly restricted sandbox), it may be necessary to disable the feature regardless of performance effects.
    Feature is enabled by default.
  - OVERRIDE_PUBLIC_ACCESS_MODIFIERS
```
public static final MapperFeature OVERRIDE_PUBLIC_ACCESS_MODIFIERS
```
    Feature that determines that forces call to AccessibleObject.setAccessible(java.lang.reflect.AccessibleObject[], boolean) even for public accessors -- that is, even if no such call is needed from functionality perspective -- if call is allowed (that is, CAN_OVERRIDE_ACCESS_MODIFIERS is set to true). The main reason to enable this feature is possible performance improvement as JDK does not have to perform access checks; these checks are otherwise made for all accessors, including public ones, and may result in slower Reflection calls. Exact impact (if any) depends on Java platform (Java SE, Android) as well as JDK version.
    Feature is enabled by default, for legacy reasons (it was the behavior until 2.6)
    
    Since:
    
    2.7
  - USE_STATIC_TYPING
```
public static final MapperFeature USE_STATIC_TYPING
```
    Feature that determines whether the type detection for serialization should be using actual dynamic runtime type, or declared static type. Note that deserialization always uses declared static types since no runtime types are available (as we are creating instances after using type information).
    This global default value can be overridden at class, method or field level by using JsonSerialize.typing() annotation property.
    Feature is disabled by default which means that dynamic runtime types are used (instead of declared static types) for serialization.
  - USE_BASE_TYPE_AS_DEFAULT_IMPL
```
public static final MapperFeature USE_BASE_TYPE_AS_DEFAULT_IMPL
```
    Feature that specifies whether the declared base type of a polymorphic value is to be used as the "default" implementation, if no explicit default class is specified via @JsonTypeInfo.defaultImpl annotation.
    Note that feature only has effect on deserialization of regular polymorphic properties: it does NOT affect non-polymorphic cases, and is unlikely to work with Default Typing.
    Feature is disabled by default for backwards compatibility.
    
    Since:
    
    2.10
  - INFER_BUILDER_TYPE_BINDINGS
```
public static final MapperFeature INFER_BUILDER_TYPE_BINDINGS
```
    Feature that enables inferring builder type bindings from the value type being deserialized. This requires that the generic type declaration on the value type match that on the builder exactly: mismatched type declarations are not necessarily detected by databind.
    Feature is enabled by default which means that deserialization does support deserializing types via builders with type parameters (generic types).
    See: databind#921
    
    Since:
    
    2.12
  - REQUIRE_TYPE_ID_FOR_SUBTYPES
```
public static final MapperFeature REQUIRE_TYPE_ID_FOR_SUBTYPES
```
    Feature that determines what happens when deserializing to a registered sub-type (polymorphic deserialization), but no type information has been provided. If enabled, then an InvalidTypeIdException will be thrown; if disabled then the deserialization may proceed without the type information if sub-type is legit target (non-abstract).
    Feature is enabled by default for backwards-compatibility (same behavior as in Jackson 2.14 and earlier).
    
    Since:
    
    2.15
  - DEFAULT_VIEW_INCLUSION
```
public static final MapperFeature DEFAULT_VIEW_INCLUSION
```
    Feature that determines whether properties that have no view annotations are included in JSON serialization views (see JsonView for more details on JSON Views). If enabled, non-annotated properties will be included; when disabled, they will be excluded. So this feature changes between "opt-in" (feature disabled) and "opt-out" (feature enabled) modes.
    Default value is enabled, meaning that non-annotated properties are included in all views if there is no JsonView annotation.
    Feature is enabled by default.
  - SORT_PROPERTIES_ALPHABETICALLY
```
public static final MapperFeature SORT_PROPERTIES_ALPHABETICALLY
```
    Feature that defines default property serialization order used for POJO properties. If enabled, default ordering is alphabetic (similar to how JsonPropertyOrder.alphabetic() works); if disabled, order is unspecified (based on what JDK gives us, which may be declaration order, but is not guaranteed).
    Note that this is just the default behavior and can be overridden by explicit overrides in classes (for example with JsonPropertyOrder annotation)
    Note: does not apply to Map serialization (since entries are not considered Bean/POJO properties.
    Feature is disabled by default.
  - SORT_CREATOR_PROPERTIES_FIRST
```
public static final MapperFeature SORT_CREATOR_PROPERTIES_FIRST
```
    Feature that defines whether Creator properties (ones passed through constructor or static factory method) should be sorted before other properties for which no explicit order is specified, in case where alphabetic ordering is to be used for such properties. Note that in either case explicit order (whether by name or by index) will have precedence over this setting.
    Note: does not apply to Map serialization (since entries are not considered Bean/POJO properties.
    WARNING: Disabling it may have a negative impact on deserialization performance. When disabled, all properties before the last creator property in the input need to be buffered, since all creator properties are required to create the instance. Enabling this feature ensures that there is as little buffering as possible.
    Feature is enabled by default.
    
    Since:
    
    2.12
  - ACCEPT_CASE_INSENSITIVE_PROPERTIES
```
public static final MapperFeature ACCEPT_CASE_INSENSITIVE_PROPERTIES
```
    Feature that will allow for more forgiving deserialization of incoming JSON. If enabled, the bean properties will be matched using their lower-case equivalents, meaning that any case-combination (incoming and matching names are canonicalized by lower-casing) should work.
    Note that there is additional performance overhead since incoming property names need to be lower-cased before comparison, for cases where there are upper-case letters. Overhead for names that are already lower-case should be negligible.
    Feature is disabled by default.
    
    Since:
    
    2.5
  - ACCEPT_CASE_INSENSITIVE_ENUMS
```
public static final MapperFeature ACCEPT_CASE_INSENSITIVE_ENUMS
```
    Feature that determines if Enum deserialization should be case sensitive or not. If enabled, Enum deserialization will ignore case, that is, case of incoming String value and enum id (depending on other settings, either `name()`, `toString()`, or explicit override) do not need to match.
    This should allow both Enum-as-value deserialization and Enum-as-Map-key, but latter only works since Jackson 2.12 (due to incomplete implementation).
    Feature is disabled by default.
    
    Since:
    
    2.9
  - ACCEPT_CASE_INSENSITIVE_VALUES
```
public static final MapperFeature ACCEPT_CASE_INSENSITIVE_VALUES
```
    Feature that permits parsing some enumerated text-based value types but ignoring the case of the values on deserialization: for example, date/time type deserializers. Support for this feature depends on deserializer implementations using it.
    Note, however, that regular Enum types follow ACCEPT_CASE_INSENSITIVE_ENUMS setting instead.
    Feature is disabled by default.
    
    Since:
    
    2.10
  - USE_WRAPPER_NAME_AS_PROPERTY_NAME
```
public static final MapperFeature USE_WRAPPER_NAME_AS_PROPERTY_NAME
```
    Feature that can be enabled to make property names be overridden by wrapper name (usually detected with annotations as defined by AnnotationIntrospector.findWrapperName(com.fasterxml.jackson.databind.introspect.Annotated). If enabled, all properties that have associated non-empty Wrapper name will use that wrapper name instead of property name. If disabled, wrapper name is only used for wrapping (if anything).
    Feature is disabled by default.
    
    Since:
    
    2.1
  - USE_STD_BEAN_NAMING
```
public static final MapperFeature USE_STD_BEAN_NAMING
```
    Feature that may be enabled to enforce strict compatibility with Bean name introspection, instead of slightly different mechanism Jackson defaults to. Specific difference is that Jackson always lower cases leading upper-case letters, so "getURL()" becomes "url" property; whereas standard Bean naming only lower-cases the first letter if it is NOT followed by another upper-case letter (so "getURL()" would result in "URL" property).
    Feature is disabled by default for backwards compatibility purposes: earlier Jackson versions used Jackson's own mechanism.
    
    Since:
    
    2.5
  - ALLOW_EXPLICIT_PROPERTY_RENAMING
```
public static final MapperFeature ALLOW_EXPLICIT_PROPERTY_RENAMING
```
    Feature that when enabled will allow explicitly named properties (i.e., fields or methods annotated with JsonProperty("explicitName")) to be re-named by a PropertyNamingStrategy, if one is configured.
    Feature is disabled by default.
    
    Since:
    
    2.7
  - ALLOW_IS_GETTERS_FOR_NON_BOOLEAN
```
public static final MapperFeature ALLOW_IS_GETTERS_FOR_NON_BOOLEAN
```
    Feature that when enabled will allow getters with is-Prefix also for non-boolean return types; if disabled only methods that return boolean or Boolean qualify as "is getters".
    Feature is disabled by default for backwards compatibility.
    
    Since:
    
    2.14
  - ALLOW_COERCION_OF_SCALARS
```
public static final MapperFeature ALLOW_COERCION_OF_SCALARS
```
    Feature that determines whether coercions from secondary representations are allowed for simple non-textual scalar types: numbers and booleans. This includes `primitive` types and their wrappers, but excludes `java.lang.String` and date/time types.
    When feature is disabled, only strictly compatible input may be bound: numbers for numbers, boolean values for booleans. When feature is enabled, conversions from JSON String are allowed, as long as textual value matches (for example, String "true" is allowed as equivalent of JSON boolean token `true`; or String "1.0" for `double`).
    Note that it is possible that other configurability options can override this in closer scope (like on per-type or per-property basis); this is just the global default.
    Feature is enabled by default (for backwards compatibility since this was the default behavior)
    
    Since:
    
    2.9
  - IGNORE_DUPLICATE_MODULE_REGISTRATIONS
```
public static final MapperFeature IGNORE_DUPLICATE_MODULE_REGISTRATIONS
```
    Feature that determines whether multiple registrations of same module should be ignored or not; if enabled, only the first registration call results in module being called, and possible duplicate calls are silently ignored; if disabled, no checking is done and all registration calls are dispatched to module.
    Definition of "same module" is based on using Module.getTypeId(); modules with same non-null type id are considered same for purposes of duplicate registration. This also avoids having to keep track of actual module instances; only ids will be kept track of (and only if this feature is enabled).
    Feature is enabled by default.
    
    Since:
    
    2.5
  - IGNORE_MERGE_FOR_UNMERGEABLE
```
public static final MapperFeature IGNORE_MERGE_FOR_UNMERGEABLE
```
    Setting that determines what happens if an attempt is made to explicitly "merge" value of a property, where value does not support merging; either merging is skipped and new value is created (true) or an exception is thrown (false).
    Feature is enabled by default, to allow use of merge defaults even in presence of some unmergeable properties.
    
    Since:
    
    2.9
  - BLOCK_UNSAFE_POLYMORPHIC_BASE_TYPES
```
public static final MapperFeature BLOCK_UNSAFE_POLYMORPHIC_BASE_TYPES
```
    Setting that may be enabled to reconfigure default PolymorphicTypeValidator used by legacy ObjectMapper.enableDefaultTyping() methods as well as default used for annotation-based polymorphic handling so that it uses DefaultBaseTypeLimitingValidator. This will block use of a set of "unsafe" base types such as Object through methods that do not require passing of explicit PolymorphicTypeValidator. It is still possible to override one used; this only affects default settings.
    Enabling of this setting is strongly recommended.
    Feature is disabled by default in 2.x for backwards compatibility reasons: it will become default setting (and feature likely removed) in 3.0.
    
    Since:
    
    2.11
  - APPLY_DEFAULT_VALUES
```
public static final MapperFeature APPLY_DEFAULT_VALUES
```
    Feature that determines whether ObjectReader applies default values defined in class definitions in cases where the input data omits the relevant values.
    Not all modules will respect this feature. Initially, only jackson-module-scala will respect this feature but other modules will add support over time.
    Feature is enabled by default.
    
    Since:
    
    2.13
- Method Detail
  - values
```
public static MapperFeature[] values()
```
    Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
```
for (MapperFeature c : MapperFeature.values())
    System.out.println(c);
```
    Returns:
    
    an array containing the constants of this enum type, in the order they are declared
  - valueOf
```
public static MapperFeature valueOf(String name)
```
    Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
    
    Parameters:
    
    name - the name of the enum constant to be returned.
    
    Returns:
    
    the enum constant with the specified name
    
    Throws:
    
    IllegalArgumentException - if this enum type has no constant with the specified name
    
    NullPointerException - if the argument is null
  - collectLongDefaults
```
public static long collectLongDefaults()
```
  - enabledByDefault
```
public boolean enabledByDefault()
```
    Description copied from interface: ConfigFeature
    
    Accessor for checking whether this feature is enabled by default.
    
    Specified by:
    
    enabledByDefault in interface ConfigFeature
  - getMask
```
@Deprecated
public int getMask()
```
    Deprecated.
    
    Description copied from interface: ConfigFeature
    
    Returns bit mask for this feature instance
    
    Specified by:
    
    getMask in interface ConfigFeature
  - getLongMask
```
public long getLongMask()
```
  - enabledIn
```
@Deprecated
public boolean enabledIn(int flags)
```
    Deprecated.
    
    Description copied from interface: ConfigFeature
    
    Convenience method for checking whether feature is enabled in given bitmask
    
    Specified by:
    
    enabledIn in interface ConfigFeature
  - enabledIn
```
public boolean enabledIn(long flags)
```

Enum MapperFeature

Enum Constant Summary

Method Summary

Methods inherited from class java.lang.Enum

Methods inherited from class java.lang.Object

Enum Constant Detail

USE_ANNOTATIONS

USE_GETTERS_AS_SETTERS

PROPAGATE_TRANSIENT_MARKER

AUTO_DETECT_CREATORS

AUTO_DETECT_FIELDS

AUTO_DETECT_GETTERS

AUTO_DETECT_IS_GETTERS

AUTO_DETECT_SETTERS

REQUIRE_SETTERS_FOR_GETTERS

ALLOW_FINAL_FIELDS_AS_MUTATORS

INFER_PROPERTY_MUTATORS

INFER_CREATOR_FROM_CONSTRUCTOR_PROPERTIES

ALLOW_VOID_VALUED_PROPERTIES

CAN_OVERRIDE_ACCESS_MODIFIERS

OVERRIDE_PUBLIC_ACCESS_MODIFIERS

USE_STATIC_TYPING

USE_BASE_TYPE_AS_DEFAULT_IMPL

INFER_BUILDER_TYPE_BINDINGS

REQUIRE_TYPE_ID_FOR_SUBTYPES

DEFAULT_VIEW_INCLUSION

SORT_PROPERTIES_ALPHABETICALLY

SORT_CREATOR_PROPERTIES_FIRST

ACCEPT_CASE_INSENSITIVE_PROPERTIES

ACCEPT_CASE_INSENSITIVE_ENUMS

ACCEPT_CASE_INSENSITIVE_VALUES

USE_WRAPPER_NAME_AS_PROPERTY_NAME

USE_STD_BEAN_NAMING

ALLOW_EXPLICIT_PROPERTY_RENAMING

ALLOW_IS_GETTERS_FOR_NON_BOOLEAN

ALLOW_COERCION_OF_SCALARS

IGNORE_DUPLICATE_MODULE_REGISTRATIONS

IGNORE_MERGE_FOR_UNMERGEABLE

BLOCK_UNSAFE_POLYMORPHIC_BASE_TYPES

APPLY_DEFAULT_VALUES

Method Detail

values

valueOf

collectLongDefaults

enabledByDefault

getMask

getLongMask

enabledIn

enabledIn