javax.ws.rs.ext

## Interface ExceptionMapper<E extends Throwable>

- Type Parameters:
    `E` - exception type supported by the provider.
  All Known Implementing Classes:
    FooExceptionMapper, MyApp.PrintingErrorHandler, ResteasyViolationExceptionMapper, ServiceUnavailableExceptionMapper

      public interface ExceptionMapper<E extends Throwable>

  Contract for a provider that maps Java exceptions to `Response`.

  Providers implementing `ExceptionMapper` contract must be either programmatically registered in a JAX-RS runtime or must be annotated with `@Provider` annotation to be automatically discovered by the JAX-RS runtime during a provider scanning phase.

  Since:
    1.0
  Author:
    Paul Sandoz, Marc Hadley
  See Also:
    `Provider`, `Response`

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `Response` | `toResponse(E exception)` Map an exception to a `Response`.

- - ### Method Detail

    - #### toResponse

          Response toResponse(E exception)

      Map an exception to a `Response`. Returning `null` results in a `Response.Status.NO_CONTENT` response. Throwing a runtime exception results in a `Response.Status.INTERNAL_SERVER_ERROR` response.
      Parameters:
        `exception` - the exception to map to a response.
      Returns:
        a response mapped from the supplied exception.

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