picocli

## Interface CommandLine.IExceptionHandler2<R>

- Type Parameters:
    `R` - the return type of this handler
  All Known Implementing Classes:
    CommandLine.DefaultExceptionHandler
  Enclosing class:
    CommandLine

      public static interface CommandLine.IExceptionHandler2<R>

  Classes implementing this interface know how to handle `ParameterExceptions` (usually from invalid user input) and `ExecutionExceptions` that occurred while executing the `Runnable` or `Callable` command.

  Implementations of this interface can be passed to the `CommandLine::parseWithHandlers` method.

  This interface replaces the `CommandLine.IParseResultHandler` interface.

  Since:
    3.0
  See Also:
    `CommandLine.DefaultExceptionHandler`

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `R` | `handleExecutionException(CommandLine.ExecutionException ex, CommandLine.ParseResult parseResult)` Handles a `ExecutionException` that occurred while executing the `Runnable` or `Callable` command and optionally returns a list of results.
    `R` | `handleParseException(CommandLine.ParameterException ex, String[] args)` Handles a `ParameterException` that occurred while parsing the command line arguments and optionally returns a list of results.

- - ### Method Detail

    - #### handleParseException

          R handleParseException(CommandLine.ParameterException ex,
                                 String[] args)

      Handles a `ParameterException` that occurred while parsing the command line arguments and optionally returns a list of results.
      Parameters:
        `ex` - the ParameterException describing the problem that occurred while parsing the command line arguments, and the CommandLine representing the command or subcommand whose input was invalid
        `args` - the command line arguments that could not be parsed
      Returns:
        an object resulting from handling the exception

    - #### handleExecutionException

          R handleExecutionException(CommandLine.ExecutionException ex,
                                     CommandLine.ParseResult parseResult)

      Handles a `ExecutionException` that occurred while executing the `Runnable` or `Callable` command and optionally returns a list of results.
      Parameters:
        `ex` - the ExecutionException describing the problem that occurred while executing the `Runnable` or `Callable` command, and the CommandLine representing the command or subcommand that was being executed
        `parseResult` - the result of parsing the command line arguments
      Returns:
        an object resulting from handling the exception

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