Package nz.org.riskscape.picocli

Interface CommandLine.IExecutionExceptionHandler

Enclosing class:
CommandLine
public static interface CommandLine.IExecutionExceptionHandler

Classes implementing this interface know how to handle Exceptions that occurred while executing the Runnable, Callable or Method user object of the command.

Implementation Requirements:

Implementors that need to print messages to the console should use the output and error PrintWriters, and the color scheme from the CommandLine object obtained from the exception.

API Note:

This interface supersedes CommandLine.IExceptionHandler2.

Example usage:

  IExecutionExceptionHandler errorHandler = new IExecutionExceptionHandler() {
      public int handleExecutionException(Exception ex,
                                          CommandLine commandLine,
                                          ParseResult parseResult) {
          //ex.printStackTrace(); // no stack trace
          commandLine.getErr().println(ex.getMessage());
          commandLine.usage(commandLine.getErr());
          return commandLine.getCommandSpec().exitCodeOnExecutionException();
      }
  };
  int exitCode = new CommandLine(new App())
          .setExecutionExceptionHandler(errorHandler)
          .execute(args);

Since:
4.0
See Also:

  • Method Details

    • handleExecutionException

      int handleExecutionException(Exception ex, CommandLine commandLine, CommandLine.ParseResult parseResult) throws Exception
      Handles an Exception that occurred while executing the Runnable or Callable command and returns an exit code suitable for returning from CommandLine.execute(String...).
      Parameters:
      ex - the Exception thrown by the Runnable, Callable or Method user object of the command
      commandLine - the CommandLine representing the command or subcommand where the exception occurred
      parseResult - the result of parsing the command line arguments
      Returns:
      an exit code
      Throws:
      Exception