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airlift / airline

Java annotation-based framework for parsing Git like command line structures
Apache License 2.0
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Help class NPE #13

Closed nitay closed 6 years ago

nitay commented 11 years ago

So far this is all I have. Will update with more details / simpler reproducable example

public static void main(String[] args) throws Exception { Cli.CliBuilder builder = Cli.builder("hio") .withDefaultCommand(Help.class) .withCommands(Help.class, InputBenchmarkCmd.class, TailerCmd.class, ConfOptionsCmd.class); Cli cli = builder.build(); cli.parse(args).run(); }

nitayj@nitay-fb hive-io-3 (h3|● 6✚ 36) $ java -jar hive-io-exp-cmdline/target/hive-io-exp-cmdline-0.8-SNAPSHOT-jar-with-dependencies.jar help Exception in thread "main" java.lang.NullPointerException at io.airlift.command.UsagePrinter.appendWords(UsagePrinter.java:105) at io.airlift.command.GlobalUsageSummary.usage(GlobalUsageSummary.java:73) at io.airlift.command.GlobalUsageSummary.usage(GlobalUsageSummary.java:52) at io.airlift.command.Help.help(Help.java:45) at io.airlift.command.Help.help(Help.java:38) at io.airlift.command.Help.run(Help.java:25) at com.facebook.hiveio.cmdline.Main.main(Main.java:34)

merrill77 commented 9 years ago

I ran into this as well. I wanted to show help when the parser thrown an exception, so I tried this:

    try
        {
        parser.parse(args).run();
        }
    catch (Exception e)
        {
        new Help().run();
        }

The result was:

Exception in thread "main" java.lang.NullPointerException at io.airlift.airline.GlobalUsageSummary.usage(GlobalUsageSummary.java:63) at io.airlift.airline.GlobalUsageSummary.usage(GlobalUsageSummary.java:52) at io.airlift.airline.Help.help(Help.java:57) at io.airlift.airline.Help.help(Help.java:50) at io.airlift.airline.Help.run(Help.java:25) at org.musetest.commandline.Launcher.main(Launcher.java:34)