# Package javax.ws.rs.ext

APIs that provide extensions to the types supported by the JAX-RS API.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  ContextResolver<T> | Contract for a provider that supplies context information to resource classes and other providers.
  ExceptionMapper<E extends Throwable> | Contract for a provider that maps Java exceptions to `Response`.
  InterceptorContext | Context shared by message body interceptors that can be used to wrap calls to `MessageBodyReader.readFrom(java.lang.Class<T>, java.lang.reflect.Type, java.lang.annotation.Annotation[], javax.ws.rs.core.MediaType, javax.ws.rs.core.MultivaluedMap<java.lang.String, java.lang.String>, java.io.InputStream)` and `MessageBodyWriter.writeTo(T, java.lang.Class<?>, java.lang.reflect.Type, java.lang.annotation.Annotation[], javax.ws.rs.core.MediaType, javax.ws.rs.core.MultivaluedMap<java.lang.String, java.lang.Object>, java.io.OutputStream)`.
  MessageBodyReader<T> | Contract for a provider that supports the conversion of a stream to a Java type.
  MessageBodyWriter<T> | Contract for a provider that supports the conversion of a Java type to a stream.
  ParamConverter<T> | Defines a contract for a delegate responsible for converting between a `String` form of a message parameter value and the corresponding custom Java type `T`.
  ParamConverterProvider | Contract for a provider of `ParamConverter` instances.
  Providers | An injectable interface providing runtime lookup of provider instances.
  ReaderInterceptor | Interface for message body reader interceptors that wrap around calls to `MessageBodyReader.readFrom(java.lang.Class<T>, java.lang.reflect.Type, java.lang.annotation.Annotation[], javax.ws.rs.core.MediaType, javax.ws.rs.core.MultivaluedMap<java.lang.String, java.lang.String>, java.io.InputStream)`.
  ReaderInterceptorContext | Context class used by `ReaderInterceptor` to intercept calls to (@link javax.ws.rs.ext.MessageBodyReader#readFrom}.
  RuntimeDelegate.HeaderDelegate<T> | Defines the contract for a delegate that is responsible for converting between the String form of a HTTP header and the corresponding JAX-RS type `T`.
  WriterInterceptor | Interface for message body writer interceptors that wrap around calls to `MessageBodyWriter.writeTo(T, java.lang.Class<?>, java.lang.reflect.Type, java.lang.annotation.Annotation[], javax.ws.rs.core.MediaType, javax.ws.rs.core.MultivaluedMap<java.lang.String, java.lang.Object>, java.io.OutputStream)`.
  WriterInterceptorContext | Context class used by `WriterInterceptor` to intercept calls to `MessageBodyWriter.writeTo(T, java.lang.Class<?>, java.lang.reflect.Type, java.lang.annotation.Annotation[], javax.ws.rs.core.MediaType, javax.ws.rs.core.MultivaluedMap<java.lang.String, java.lang.Object>, java.io.OutputStream)`.

- Class Summary
  Class | Description
  --- | ---
  RuntimeDelegate | Implementations of JAX-RS provide a concrete subclass of RuntimeDelegate and various JAX-RS API methods defer to methods of RuntimeDelegate for their functionality.

- Annotation Types Summary
  Annotation Type | Description
  --- | ---
  ParamConverter.Lazy | Mandates that a conversion of any `default value` delegated to a `parameter converter` annotated with `@Lazy` annotation SHOULD occur only once the value is actually required (e.g.
  Provider | Marks an implementation of an extension interface that should be discoverable by JAX-RS runtime during a provider scanning phase.

## Package javax.ws.rs.ext Description

APIs that provide extensions to the types supported by the JAX-RS API.

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