ErrorListener (XML Standard API)
Date: 2016-02-19

javax.xml.transform

## Interface ErrorListener

-     public interface ErrorListener

  To provide customized error handling, implement this interface and use the `setErrorListener` method to register an instance of the implementation with the `Transformer`. The `Transformer` then reports all errors and warnings through this interface.

  If an application does not register its own custom `ErrorListener`, the default `ErrorListener` is used which reports all warnings and errors to `System.err` and does not throw any `Exception`s. Applications are strongly encouraged to register and use `ErrorListener`s that insure proper behavior for warnings and errors.

  For transformation errors, a `Transformer` must use this interface instead of throwing an `Exception`: it is up to the application to decide whether to throw an `Exception` for different types of errors and warnings. Note however that the `Transformer` is not required to continue with the transformation after a call to `fatalError(TransformerException exception)`.

  `Transformer`s may use this mechanism to report XML parsing errors as well as transformation errors.

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `error(TransformerException exception)` Receive notification of a recoverable error.
    `void` | `fatalError(TransformerException exception)` Receive notification of a non-recoverable error.
    `void` | `warning(TransformerException exception)` Receive notification of a warning.

- - ### Method Detail

    - #### warning

          void warning(TransformerException exception)
                       throws TransformerException

      Receive notification of a warning.

      `Transformer` can use this method to report conditions that are not errors or fatal errors. The default behaviour is to take no action.

      After invoking this method, the Transformer must continue with the transformation. It should still be possible for the application to process the document through to the end.

      Parameters:
        `exception` - The warning information encapsulated in a transformer exception.
      Throws:
        `TransformerException` - if the application chooses to discontinue the transformation.
      See Also:
        `TransformerException`

    - #### error

          void error(TransformerException exception)
                     throws TransformerException

      Receive notification of a recoverable error.

      The transformer must continue to try and provide normal transformation after invoking this method. It should still be possible for the application to process the document through to the end if no other errors are encountered.

      Parameters:
        `exception` - The error information encapsulated in a transformer exception.
      Throws:
        `TransformerException` - if the application chooses to discontinue the transformation.
      See Also:
        `TransformerException`

    - #### fatalError

          void fatalError(TransformerException exception)
                          throws TransformerException

      Receive notification of a non-recoverable error.

      The `Transformer` must continue to try and provide normal transformation after invoking this method. It should still be possible for the application to process the document through to the end if no other errors are encountered, but there is no guarantee that the output will be useable.

      Parameters:
        `exception` - The error information encapsulated in a `TransformerException`.
      Throws:
        `TransformerException` - if the application chooses to discontinue the transformation.
      See Also:
        `TransformerException`

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