If bean is null, message "X is not a valid option" occurs

[ghost]

Consider this:

public static Bean bean;

public static void main(String[] args) throws IOException, CmdLineException {
	CmdLineParser parser = new CmdLineParser(bean);
	parser.parseArgument(args);

	Appendable output;
	if (bean.getOutputFile() == null) {
		output = new ConsoleAppendable();
	} else {
		output = new BufferedWriter(new FileWriter(bean.getOutputFile()));
	}
}

with Bean being:

@Getter
@Setter
@ToString
public class Bean {
	@Option(name = "-o", required = false)
	private File outputFile;
}

will result in:

Exception in thread "main" org.kohsuke.args4j.CmdLineException: "-o=foo.txt" is not a valid option
	at org.kohsuke.args4j.CmdLineParser.parseArgument(CmdLineParser.java:497)
	at com.pany.project.Main.main(Main.java:24)

because bean is null.

Proposal

1. Fix javadoc (javadoc is stating "processing will be skipped o null input", what is not the case)
   and/or
2. Check for null input and print a correct error message