Package org.apache.tapestry5.services

## Interface RequestExceptionHandler

- All Known Implementing Classes:
    `DefaultRequestExceptionHandler`

      @UsesMappedConfiguration(key=java.lang.Class.class,
                               value=java.lang.Object.class)
      public interface RequestExceptionHandler

  Service invoked when an uncaught exception occurs. The error handler is responsible for providing a response to the user to describe the error. The default implementation accepts the configuration, which maps an exception class to a corresponding helper. The helper is either an instance of `ExceptionHandlerAssistant` or is a Class for a page that will be redirected to, to present the exception.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | `handleRequestException​(Throwable exception)` | Responsible for handling the error in some way and providing some response to the client.

- - ### Method Detail

    - #### handleRequestException

          void handleRequestException​(Throwable exception)
                               throws IOException

      Responsible for handling the error in some way and providing some response to the client. A default implementation may render an error response page. The handler is also responsible for setting the response status and the X-Tapestry-ErrorMessage response header. These are very important in Ajax requests to allow the client-side logic to detect the error and present it to the user.
      Parameters:
        `exception` - uncaught exception to be reported
      Throws:
        `IOException`