CommandLine.DefaultExceptionHandler

java.lang.Object
- org.apache.logging.log4j.core.tools.picocli.CommandLine.DefaultExceptionHandler

All Implemented Interfaces:

CommandLine.IExceptionHandler

Enclosing class:

CommandLine
```
public static class CommandLine.DefaultExceptionHandler
extends java.lang.Object
implements CommandLine.IExceptionHandler
```
Default exception handler that prints the exception message to the specified PrintStream, followed by the usage message for the command or subcommand whose input was invalid.
Implementation roughly looks like this:
```
     System.err.println(paramException.getMessage());
     paramException.getCommandLine().usage(System.err);
 
```
Since:

2.0

Constructor Summary

Constructors
Constructor Description

DefaultExceptionHandler()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.util.List<java.lang.Object>`	`handleException(CommandLine.ParameterException ex, java.io.PrintStream out, CommandLine.Help.Ansi ansi, java.lang.String... args)`	Handles a `ParameterException` that occurred while parsing the command line arguments and optionally returns a list of results.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - DefaultExceptionHandler
```
public DefaultExceptionHandler()
```
- Method Detail
  - handleException
```
public java.util.List<java.lang.Object> handleException(CommandLine.ParameterException ex,
                                                        java.io.PrintStream out,
                                                        CommandLine.Help.Ansi ansi,
                                                        java.lang.String... args)
```
    Description copied from interface: CommandLine.IExceptionHandler
    
    Handles a ParameterException that occurred while parsing the command line arguments and optionally returns a list of results.
    
    Specified by:
    
    handleException in interface CommandLine.IExceptionHandler
    
    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
    
    out - the PrintStream to print help to if requested
    
    ansi - for printing help messages using ANSI styles and colors
    
    args - the command line arguments that could not be parsed
    
    Returns:
    
    a list of results, or an empty list if there are no results