程序正常退出后打印错误消息答案

【问题标题】：Error message prints after normal exit of the program程序正常退出后打印错误消息
【发布时间】：2021-07-20 16:31:57
【问题描述】：

我正在 picocli 中编写一个 CLI 应用程序，它将执行用户指定次数的操作，然后在此之后正常退出。但是，当程序退出时，picocli 会打印“未知选项”错误，即使程序已经识别出选项已成功运行。

错误输出如下：

    Unknown options: '-j', '~/example_dir/example.json'
    Usage: <main class> [-h] [COMMAND]
        -h, --help   Prints this help message and exits
    Commands:
        example_command  does things

Process finished with exit code 0

任何想法为什么会发生这种情况？

以下是代码结构的概述：

Command Line Runner，创建 Picocli 的 CommandLine 实例

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.ExitCodeGenerator;
import org.springframework.stereotype.Component;
import picocli.CommandLine;

@Component
public class ApplicationRunner implements CommandLineRunner, ExitCodeGenerator {
    private int exitCode;

    @Autowired
    private CommandSample commandSample;

    @Override
    public void run(String... args) throws Exception {
        exitCode = new CommandLine(commandSample).execute(args);
    }

    @Override
    public int getExitCode() {
        return exitCode;
    }

}

Spring 启动应用程序：

@SpringBootApplication
public class SpringApp {
    public static void main(String[] args) {
        SpringApplication app = new SpringApplication(SpringApp.class);
        app.setBannerMode(Banner.Mode.OFF);
        System.exit(SpringApplication.exit(app.run(args)));
    }
}

CommandSample 类中的选项，即 @Command 本身

@Command(
        description = "Publish Specified Test JSON to Specified Topics",
        mixinStandardHelpOptions = true,
        version = "beta"
        )
@Controller
public class CommandSample implements Runnable, ExitCodeGenerator{

    @Option(
            names = {"-j", "--json"},
            paramLabel = "<PATH_TO_JSON>",
            description = "Absolute Path to the JSON Payload, supports '~' as an alias for home directory"
    )
    private String path_to_JSON;

    @Option(
            names = {"-t", "--topic"},
            paramLabel = "<MQTT_TOPIC>",
            description = "MQTT topic which you wish to publish to"
    )
    private String mqtt_topic;

    @Option(
            names = {"-n", "--number"},
            paramLabel = "<NUMBER_OF_REQUESTS>",
            description = "Number of times to publish to topic before exiting",
            defaultValue = "5"
    )
    private long number_of_requests = 5;

    @Option(
            names = {"-i", "--interval"},
            paramLabel ="<INTERVAL_BETWEEN_PUBLISH>",
            description = "Interval between individual publishes (in milliseconds)"
    )
    private long sleep_time_ms = 5000L;

@Override
    public void run() {
        // Some MQTT stuff
    }
    int exitcode;
    @Override
    public int getExitCode() {
        return exitcode;
    }

}

【问题讨论】：

我认为一些代码可以很好地重现问题。
请提供重现问题的步骤，最好显示您的程序代码和指定为输入的命令行参数的完整列表。
感谢您的反馈，添加了一些我认为相关的代码。

标签： java spring-boot maven command-line-interface picocli

【解决方案1】：

有趣的是，问题在于我在加载主要 picocli-4.6.1 依赖项后包含了以下依赖项。其中包括可能已经更新的版本。

我的 pom.xml 中有问题的依赖项：

        <dependency>
            <groupId>com.kakawait</groupId>
            <artifactId>picocli-spring-boot-starter</artifactId>
            <version>0.2.0</version>
        </dependency>

【讨论】：