```
@Target({FIELD,METHOD,PARAMETER,TYPE})
@Retention(RUNTIME)
@Inherited
public @interface Schema
```
The Schema Object allows the definition of input and output data types. These types can be objects, but also primitives and arrays. This object is an extended subset of the JSON Schema Specification Wright Draft 00.

See Also:

OpenAPI Specification Schema Object

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element	Description
`java.lang.Class<?>[]`	`allOf`	Provides an array of java class implementations which can be used to describe multiple acceptable schemas.
`java.lang.Class<?>[]`	`anyOf`	Provides an array of java class implementations which can be used to describe multiple acceptable schemas.
`java.lang.String`	`defaultValue`	Provides a default value.
`boolean`	`deprecated`	Specifies that a schema is deprecated and SHOULD be transitioned out of usage.
`java.lang.String`	`description`	A description of the schema.
`DiscriminatorMapping[]`	`discriminatorMapping`	An array of discriminator mappings.
`java.lang.String`	`discriminatorProperty`	Provides a discriminator property value.
`java.lang.String[]`	`enumeration`	Provides a list of enum values.
`java.lang.String`	`example`	A free-form property to include an example of an instance for this schema.
`boolean`	`exclusiveMaximum`	If true, makes the maximum value exclusive, or a less-than criteria.
`boolean`	`exclusiveMinimum`	If true, makes the minimum value exclusive, or a greater-than criteria.
`ExternalDocumentation`	`externalDocs`	Additional external documentation for this schema.
`java.lang.String`	`format`	Provides an optional override for the format.
`boolean`	`hidden`	Allows schema to be marked as hidden.
`java.lang.Class<?>`	`implementation`	Provides a java class as implementation for this schema.
`java.lang.String`	`maximum`	Sets the maximum numeric value for a property.
`int`	`maxItems`	Only applicable if type=array.
`int`	`maxLength`	Sets the maximum length of a string value.
`int`	`maxProperties`	Constrains the number of arbitrary properties when additionalProperties is defined.
`java.lang.String`	`minimum`	Sets the minimum numeric value for a property.
`int`	`minItems`	Only applicable if type=array.
`int`	`minLength`	Sets the minimum length of a string value.
`int`	`minProperties`	Constrains the number of arbitrary properties when additionalProperties is defined.
`double`	`multipleOf`	Constrains a value such that when divided by the multipleOf, the remainder must be an integer.
`java.lang.String`	`name`	The name of the schema or property.
`java.lang.Class<?>`	`not`	Provides a java class to be used to disallow matching properties.
`boolean`	`nullable`	Allows sending a null value for the defined schema.
`java.lang.Class<?>[]`	`oneOf`	Provides an array of java class implementations which can be used to describe multiple acceptable schemas.
`java.lang.String`	`pattern`	A pattern that the value must satisfy.
`boolean`	`readOnly`	Relevant only for Schema "properties" definitions.
`java.lang.String`	`ref`	Reference value to a Schema definition.
`boolean`	`required`	Mandates whether the annotated item is required or not.
`java.lang.String[]`	`requiredProperties`	Allows multiple properties in an object to be marked as required.
`java.lang.String`	`title`	A title to explain the purpose of the schema.
`SchemaType`	`type`	Provides an override for the basic type of the schema.
`boolean`	`uniqueItems`	Only applicable if type=array.
`boolean`	`writeOnly`	Relevant only for Schema "properties" definitions.

- Element Detail
  - implementation
```
java.lang.Class<?> implementation
```
    Provides a java class as implementation for this schema. When provided, additional information in the Schema annotation (except for type information) will augment the java class after introspection.
    
    Returns:
    
    a class that implements this schema
    
    Default:
    
    java.lang.Void.class
- - not
```
java.lang.Class<?> not
```
    Provides a java class to be used to disallow matching properties. Inline or referenced schema MUST be of a Schema Object and not a standard JSON Schema.
    
    Returns:
    
    a class with disallowed properties
    
    Default:
    
    java.lang.Void.class
- - oneOf
```
java.lang.Class<?>[] oneOf
```
    Provides an array of java class implementations which can be used to describe multiple acceptable schemas. If more than one match the derived schemas, a validation error will occur.
    Inline or referenced schema MUST be of a Schema Object and not a standard JSON Schema.
    
    Returns:
    
    the list of possible classes for a single match
    
    Default:
    
    {}
- - anyOf
```
java.lang.Class<?>[] anyOf
```
    Provides an array of java class implementations which can be used to describe multiple acceptable schemas. If any match, the schema will be considered valid.
    Inline or referenced schema MUST be of a Schema Object and not a standard JSON Schema.
    
    Returns:
    
    the list of possible class matches
    
    Default:
    
    {}
- - allOf
```
java.lang.Class<?>[] allOf
```
    Provides an array of java class implementations which can be used to describe multiple acceptable schemas. If all match, the schema will be considered valid.
    Inline or referenced schema MUST be of a Schema Object and not a standard JSON Schema.
    
    Returns:
    
    the list of classes to match
    
    Default:
    
    {}
- - name
```
java.lang.String name
```
    The name of the schema or property.
    The name is REQUIRED when the schema is defined within Components. The name will be used as the key to add this schema to the 'schemas' map for reuse.
    
    Returns:
    
    the name of the schema
    
    Default:
    
    ""
- - title
```
java.lang.String title
```
    A title to explain the purpose of the schema.
    
    Returns:
    
    the title of the schema
    
    Default:
    
    ""
- - multipleOf
```
double multipleOf
```
    Constrains a value such that when divided by the multipleOf, the remainder must be an integer. Ignored if the value is 0.
    
    Returns:
    
    the multiplier constraint of the schema
    
    Default:
    
    0.0
- - maximum
```
java.lang.String maximum
```
    Sets the maximum numeric value for a property. Ignored if the value is an empty string.
    
    Returns:
    
    the maximum value for this schema
    
    Default:
    
    ""
- - exclusiveMaximum
```
boolean exclusiveMaximum
```
    If true, makes the maximum value exclusive, or a less-than criteria.
    
    Returns:
    
    the exclusive maximum value for this schema
    
    Default:
    
    false
- - minimum
```
java.lang.String minimum
```
    Sets the minimum numeric value for a property. Ignored if the value is an empty string or not a number.
    
    Returns:
    
    the minimum value for this schema
    
    Default:
    
    ""
- - exclusiveMinimum
```
boolean exclusiveMinimum
```
    If true, makes the minimum value exclusive, or a greater-than criteria.
    
    Returns:
    
    the exclusive minimum value for this schema
    
    Default:
    
    false
- - maxLength
```
int maxLength
```
    Sets the maximum length of a string value. Ignored if the value is negative.
    
    Returns:
    
    the maximum length of this schema
    
    Default:
    
    2147483647
- - minLength
```
int minLength
```
    Sets the minimum length of a string value. Ignored if the value is negative.
    
    Returns:
    
    the minimum length of this schema
    
    Default:
    
    0
- - pattern
```
java.lang.String pattern
```
    A pattern that the value must satisfy. Ignored if the value is an empty string.
    
    Returns:
    
    the pattern of this schema
    
    Default:
    
    ""
- - maxProperties
```
int maxProperties
```
    Constrains the number of arbitrary properties when additionalProperties is defined. Ignored if value is 0.
    
    Returns:
    
    the maximum number of properties for this schema
    
    Default:
    
    0
- - minProperties
```
int minProperties
```
    Constrains the number of arbitrary properties when additionalProperties is defined. Ignored if value is 0.
    
    Returns:
    
    the minimum number of properties for this schema
    
    Default:
    
    0
- - requiredProperties
```
java.lang.String[] requiredProperties
```
    Allows multiple properties in an object to be marked as required.
    
    Returns:
    
    the list of required schema properties
    
    Default:
    
    {}
- - required
```
boolean required
```
    Mandates whether the annotated item is required or not.
    
    Returns:
    
    whether or not this schema is required
    
    Default:
    
    false
- - description
```
java.lang.String description
```
    A description of the schema.
    
    Returns:
    
    this schema's description
    
    Default:
    
    ""
- - format
```
java.lang.String format
```
    Provides an optional override for the format.
    If a consumer is unaware of the meaning of the format, they shall fall back to using the basic type without format. For example, if \"type: integer, format: int128\" were used to designate a very large integer, most consumers will not understand how to handle it, and fall back to simply \"type: integer\"
    
    Returns:
    
    this schema's format
    
    Default:
    
    ""
- - ref
```
java.lang.String ref
```
    Reference value to a Schema definition.
    This property provides a reference to an object defined elsewhere. This property and all other properties are mutually exclusive. If other properties are defined in addition to the ref property then the result is undefined.
    
    Returns:
    
    a reference to a schema definition
    
    Default:
    
    ""
- - nullable
```
boolean nullable
```
    Allows sending a null value for the defined schema.
    
    Returns:
    
    whether or not this schema is nullable
    
    Default:
    
    false
- - readOnly
```
boolean readOnly
```
    Relevant only for Schema "properties" definitions. Declares the property as "read only". This means that it MAY be sent as part of a response but SHOULD NOT be sent as part of the request.
    If the property is marked as readOnly being true and is in the required list, the required will take effect on the response only. A property MUST NOT be marked as both readOnly and writeOnly being true.
    
    Returns:
    
    whether or not this schema is read only
    
    Default:
    
    false
- - writeOnly
```
boolean writeOnly
```
    Relevant only for Schema "properties" definitions. Declares the property as "write only". Therefore, it MAY be sent as part of a request but SHOULD NOT be sent as part of the response.
    If the property is marked as writeOnly being true and is in the required list, the required will take effect on the request only. A property MUST NOT be marked as both readOnly and writeOnly being true.
    
    Returns:
    
    whether or not this schema is write only
    
    Default:
    
    false
- - example
```
java.lang.String example
```
    A free-form property to include an example of an instance for this schema.
    To represent examples that cannot be naturally represented in JSON or YAML, a string value is used to contain the example with escaping where necessary.
    When associated with a specific media type, the example string shall be parsed by the consumer to be treated as an object or an array.
    
    Returns:
    
    an example of this schema
    
    Default:
    
    ""
- - externalDocs
```
ExternalDocumentation externalDocs
```
    Additional external documentation for this schema.
    
    Returns:
    
    additional schema documentation
    
    Default:
    
    @org.eclipse.microprofile.openapi.annotations.ExternalDocumentation
- - deprecated
```
boolean deprecated
```
    Specifies that a schema is deprecated and SHOULD be transitioned out of usage.
    
    Returns:
    
    whether or not this schema is deprecated
    
    Default:
    
    false
- - type
```
SchemaType type
```
    Provides an override for the basic type of the schema.
    Value MUST be a string. Multiple types via an array are not supported.
    MUST be a valid type per the OpenAPI Specification.
    
    Returns:
    
    the type of this schema
    
    Default:
    
    org.eclipse.microprofile.openapi.annotations.enums.SchemaType.DEFAULT
- - enumeration
```
java.lang.String[] enumeration
```
    Provides a list of enum values. Corresponds to the enum property in the OAS schema and the enumeration property in the schema model.
    
    Returns:
    
    a list of allowed schema values
    
    Default:
    
    {}
- - defaultValue
```
java.lang.String defaultValue
```
    Provides a default value. The default value represents what would be assumed by the consumer of the input as the value of the schema if one is not provided.
    Unlike JSON Schema, the value MUST conform to the defined type for the Schema Object defined at the same level.
    For example, if type is string, then default can be "foo" but cannot be 1.
    
    Returns:
    
    the default value of this schema
    
    Default:
    
    ""
- - discriminatorProperty
```
java.lang.String discriminatorProperty
```
    Provides a discriminator property value. Adds support for polymorphism.
    The discriminator is an object name that is used to differentiate between other schemas which may satisfy the payload description.
    
    Returns:
    
    the discriminator property
    
    Default:
    
    ""
- - discriminatorMapping
```
DiscriminatorMapping[] discriminatorMapping
```
    An array of discriminator mappings.
    
    Returns:
    
    the discriminator mappings for this schema
    
    Default:
    
    {}
- - hidden
```
boolean hidden
```
    Allows schema to be marked as hidden.
    
    Returns:
    
    whether or not this schema is hidden
    
    Default:
    
    false
- - maxItems
```
int maxItems
```
    Only applicable if type=array. Sets the maximum number of items in an array. This integer MUST be greater than, or equal to, 0.
    An array instance is valid against "maxItems" if its size is less than, or equal to, the value of this keyword.
    Ignored if value is Integer.MIN_VALUE.
    
    Returns:
    
    the maximum number of items in this array
    
    Default:
    
    -2147483648
- - minItems
```
int minItems
```
    Only applicable if type=array. Sets the minimum number of items in an array. This integer MUST be greater than, or equal to, 0.
    An array instance is valid against "minItems" if its size is greater than, or equal to, the value of this keyword.
    Ignored if value is Integer.MAX_VALUE.
    
    Returns:
    
    the minimum number of items in this array
    
    Default:
    
    2147483647
- - uniqueItems
```
boolean uniqueItems
```
    Only applicable if type=array. Determines if the items in the array SHOULD be unique.
    If false, the instance validates successfully. If true, the instance validates successfully if all of its elements are unique.
    
    Returns:
    
    whether the items in this array are unique
    
    Default:
    
    false

Annotation Type Schema

Optional Element Summary

Element Detail

implementation

not

oneOf

anyOf

allOf

name

title

multipleOf

maximum

exclusiveMaximum

minimum

exclusiveMinimum

maxLength

minLength

pattern

maxProperties

minProperties

requiredProperties

required

description

format

ref

nullable

readOnly

writeOnly

example

externalDocs

deprecated

type

enumeration

defaultValue

discriminatorProperty

discriminatorMapping

hidden

maxItems

minItems

uniqueItems