程序正常退出后打印错误信息

编程问答 2022-05-10

问题描述

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

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

知道为什么会这样吗？

以下是代码结构的大纲：

Command Line Runner，创建 Picocli 的命令行实例

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，这是正确的@Command

@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;
    }

}

解决方法

有趣的是，问题归结为我在加载主要 picocli-4.6.1 依赖项后包含了以下依赖项。其中可能已经包含了这个版本的最新版本。

我的 pom.xml 中的违规依赖：

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