NPE on command parse

[maximdim]

    <dependency>
      <groupId>info.picocli</groupId>
      <artifactId>picocli</artifactId>
      <version>0.9.6</version>
    </dependency>

import picocli.CommandLine;
import picocli.CommandLine.Option;

public class A {
    @Option(names = { "-u", "--user" }, required = true, description = "user id")
    private String user;

    @Option(names = { "-p", "--password" }, required = true, description = "password")
    private String password;

    public static void main(String[] args) {
        A a = new A();
        CommandLine commandLine = new CommandLine(a);
        commandLine.parse("-u", "foo");
    }
}

Leads to the following exception on run:

Exception in thread "main" java.lang.NullPointerException
	at picocli.CommandLine$PositionalParametersSorter.compare(CommandLine.java:1581)
	at picocli.CommandLine$PositionalParametersSorter.compare(CommandLine.java:1579)
	at java.util.TimSort.countRunAndMakeAscending(TimSort.java:355)
	at java.util.TimSort.sort(TimSort.java:220)
	at java.util.Arrays.sort(Arrays.java:1512)
	at java.util.ArrayList.sort(ArrayList.java:1454)
	at java.util.Collections.sort(Collections.java:175)
	at picocli.CommandLine$Interpreter.parse(CommandLine.java:1097)
	at picocli.CommandLine$Interpreter.parse(CommandLine.java:1090)
	at picocli.CommandLine.parse(CommandLine.java:191)
	at com.bmo.channels.bitbucket.A.main(A.java:16)

[remkop]

Thanks for the bug report! Commuting now, will check asap.

[remkop]

The issue has been fixed and is included in the new 0.9.7 release.
The example will now throw a MissingParameterException "Missing required option 'password'", which I believe is correct behaviour.

Please verify and let me know of any issues.