com.fasterxml.jackson.databind.ser.std

## Class NullSerializer

- java.lang.Object
- - com.fasterxml.jackson.databind.JsonSerializer<T>
  - - com.fasterxml.jackson.databind.ser.std.StdSerializer<java.lang.Object>
    - - com.fasterxml.jackson.databind.ser.std.NullSerializer

- All Implemented Interfaces:
    JsonFormatVisitable, SchemaAware, java.io.Serializable

      public class NullSerializer
      extends StdSerializer<java.lang.Object>

  This is a simple dummy serializer that will just output literal JSON null value whenever serialization is requested. Used as the default "null serializer" (which is used for serializing null object references unless overridden), as well as for some more exotic types (java.lang.Void).
  See Also:
    Serialized Form

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class com.fasterxml.jackson.databind.JsonSerializer

      `JsonSerializer.None`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static NullSerializer` | `instance`

    - ### Fields inherited from class com.fasterxml.jackson.databind.ser.std.StdSerializer

      `_handledType`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint)` Default implementation specifies no format.
    `JsonNode` | `getSchema(SerializerProvider provider, java.lang.reflect.Type typeHint)` Default implementation simply claims type is "string"; usually overriden by custom serializers.
    `void` | `serialize(java.lang.Object value, com.fasterxml.jackson.core.JsonGenerator gen, SerializerProvider provider)` Method that can be called to ask implementation to serialize values of type this serializer handles.
    `void` | `serializeWithType(java.lang.Object value, com.fasterxml.jackson.core.JsonGenerator gen, SerializerProvider serializers, TypeSerializer typeSer)` Although this method should rarely get called, for convenience we should override it, and handle it same way as "natural" types: by serializing exactly as is, without type decorations.

    - ### Methods inherited from class com.fasterxml.jackson.databind.ser.std.StdSerializer

      `createObjectNode, createSchemaNode, createSchemaNode, findAnnotatedContentSerializer, findConvertingContentSerializer, findFormatFeature, findFormatOverrides, findIncludeOverrides, findPropertyFilter, getSchema, handledType, isDefaultSerializer, visitArrayFormat, visitArrayFormat, visitFloatFormat, visitIntFormat, visitIntFormat, visitStringFormat, visitStringFormat, wrapAndThrow, wrapAndThrow`

    - ### Methods inherited from class com.fasterxml.jackson.databind.JsonSerializer

      `getDelegatee, isEmpty, isEmpty, isUnwrappingSerializer, properties, replaceDelegatee, unwrappingSerializer, usesObjectId, withFilterId`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### instance

          public static final NullSerializer instance

  - ### Method Detail

    - #### serialize

          public void serialize(java.lang.Object value,
                       com.fasterxml.jackson.core.JsonGenerator gen,
                       SerializerProvider provider)
                         throws java.io.IOException

      Description copied from class: `JsonSerializer`
      Method that can be called to ask implementation to serialize values of type this serializer handles.
      Specified by:
        `serialize` in class `StdSerializer<java.lang.Object>`
      Parameters:
        `value` - Value to serialize; can not be null.
        `gen` - Generator used to output resulting Json content
        `provider` - Provider that can be used to get serializers for serializing Objects value contains, if any.
      Throws:
        `java.io.IOException`

    - #### serializeWithType

          public void serializeWithType(java.lang.Object value,
                               com.fasterxml.jackson.core.JsonGenerator gen,
                               SerializerProvider serializers,
                               TypeSerializer typeSer)
                                 throws java.io.IOException

      Although this method should rarely get called, for convenience we should override it, and handle it same way as "natural" types: by serializing exactly as is, without type decorations. The most common possible use case is that of delegation by JSON filter; caller can not know what kind of serializer it gets handed.
      Overrides:
        `serializeWithType` in class `JsonSerializer<java.lang.Object>`
      Parameters:
        `value` - Value to serialize; can not be null.
        `gen` - Generator used to output resulting Json content
        `serializers` - Provider that can be used to get serializers for serializing Objects value contains, if any.
        `typeSer` - Type serializer to use for including type information
      Throws:
        `java.io.IOException`

    - #### getSchema

          public JsonNode getSchema(SerializerProvider provider,
                           java.lang.reflect.Type typeHint)
                             throws JsonMappingException

      Description copied from class: `StdSerializer`
      Default implementation simply claims type is "string"; usually overriden by custom serializers.
      Specified by:
        `getSchema` in interface `SchemaAware`
      Overrides:
        `getSchema` in class `StdSerializer<java.lang.Object>`
      Parameters:
        `provider` - The serializer provider.
        `typeHint` - A hint about the type.
      Returns:
        Json-schema for this serializer.
      Throws:
        `JsonMappingException`

    - #### acceptJsonFormatVisitor

          public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor,
                                     JavaType typeHint)
                                       throws JsonMappingException

      Description copied from class: `StdSerializer`
      Default implementation specifies no format. This behavior is usually overriden by custom serializers.
      Specified by:
        `acceptJsonFormatVisitor` in interface `JsonFormatVisitable`
      Overrides:
        `acceptJsonFormatVisitor` in class `StdSerializer<java.lang.Object>`
        `typeHint` - Type of element (entity like property) being visited
      Throws:
        `JsonMappingException`