我正在试验Sping Boot 通过-Dloader.main参数启动提供给它的主类的能力，如in its documentation所述。
目前我们使用的是Sping Boot 2.7.13。
下面是一个执行main()的示例 Boot 应用程序的简单shell：

@Slf4j
@SpringBootApplication
@PropertySource(value = "classpath:feeds-config.yml", factory = YamlPropertySourceFactory.class)
public class DownstreamDataFactoryApplication implements CommandLineRunner { 
            
        
    @Autowired
    private DataAcquisitionService dataAcquisitionService;
    
    @Autowired
    private DataMarshallerService dataMarshallerService;
  
    public static void main(String[] args) {

        new SpringApplicationBuilder(DownstreamDataFactoryApplication.class)
          .web(WebApplicationType.NONE)
          .run(args);
    }

    @Override
    public void run(String... args) throws Exception {
        log.debug("Starting execution");
        
        for (int i = 0; i < args.length; ++i) {
            log.info("args[{}]: {}", i, args[i]);
        }
        
        //read data
        Map<String, Object> context = new HashMap<>();
        //Flux<?> data = dataAcquisitionService.obtainData(context);
        List<?> data = dataAcquisitionService.obtainData(context);
        log.info("Obtained data: "+data);
        
        //process data
        log.info("Processed data: ");
        
        //write data
        //log.debug("Report saved to {}", dataMarshallerService.getOutputFileLocation());
        //log.debug("Ending execution");
        log.info("Marshalled data to a file: ");
        
        //distribute data
        log.info("Send marshalled data to a remote location: ");
    }

}

字符串
我的目标是在代码库中通过包结构隔离几个独立的Sping Boot 应用程序，以便根据通过-Dloader.main传递的内容运行不同的Boot应用程序。
因此，spring-boot-maven-plugin节中的mainClass节被禁用：

<plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <executions>
            <execution>
                <goals>
                    <goal>repackage</goal>
                </goals>
                <configuration>
                    <mainClass>
                     <!-- 
                    com.p.g.f.d.DownstreamDataFactoryApplication
                    -->
                    </mainClass>
                </configuration>
            </execution>
        </executions>
    </plugin>
    <plugin>
        <artifactId>maven-surefire-plugin</artifactId>
        <version>3.0.0-M6</version>
    </plugin>

型
到目前为止一切顺利
我注意到，无论是否将org.springframework.boot.loader.PropertiesLauncher作为第二个参数传递，运行时的行为似乎完全相同。
下面是提供org.springframework.boot.loader.PropertiesLauncher后的输出：

>java -jar target\downstream-data-factory-0.0.1-SNAPSHOT.jar -Dloader.main=com.xxx.globalpayments.feeds.downstream.DownstreamDataFactoryApplication org.springframework.boot.loader.PropertiesLauncher

2023-07-31 16:14:03.287 [main] INFO  c.p.g.f.d.DownstreamDataFactoryApplication - Started DownstreamDataFactoryApplication in 2.981 seconds (JVM running for 4.425)
2023-07-31 16:14:03.291 [main] DEBUG o.s.b.a.ApplicationAvailabilityBean - Application availability state LivenessState changed to CORRECT
2023-07-31 16:14:03.292 [main] DEBUG c.p.g.f.d.DownstreamDataFactoryApplication - Starting execution
2023-07-31 16:14:03.293 [main] INFO  c.p.g.f.d.DownstreamDataFactoryApplication - args[0]: -Dloader.main=com.pru.globalpayments.feeds.downstream.DownstreamDataFactoryApplication
2023-07-31 16:14:03.293 [main] INFO  c.p.g.f.d.DownstreamDataFactoryApplication - args[1]: org.springframework.boot.loader.PropertiesLauncher
2023-07-31 16:14:03.294 [main] INFO  c.p.g.f.d.DownstreamDataFactoryApplication - Obtained data: null
2023-07-31 16:14:03.295 [main] INFO  c.p.g.f.d.DownstreamDataFactoryApplication - Processed data:
2023-07-31 16:14:03.296 [main] INFO  c.p.g.f.d.DownstreamDataFactoryApplication - Marshalled data to a file:
2023-07-31 16:14:03.297 [main] INFO  c.p.g.f.d.DownstreamDataFactoryApplication - Marshalled data to a remote location:
2023-07-31 16:14:03.300 [main] DEBUG o.s.b.a.ApplicationAvailabilityBean - Application availability state ReadinessState changed to ACCEPTING_TRAFFIC
2023-07-31 16:14:03.306 [SpringApplicationShutdownHook] DEBUG o.s.c.a.AnnotationConfigApplicationContext - Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@6c130c45, started on Mon Jul 31 16:14:01 EDT 2023
2023-07-31 16:14:03.310 [SpringApplicationShutdownHook] DEBUG o.s.c.s.DefaultLifecycleProcessor - Stopping beans in phase -2147483647
2023-07-31 16:14:03.311 [SpringApplicationShutdownHook] DEBUG o.s.c.s.DefaultLifecycleProcessor - Bean 'springBootLoggingLifecycle' completed its stop procedure

型
而在没有提供的情况下：

>java -jar target\downstream-data-factory-0.0.1-SNAPSHOT.jar -Dloader.main=com.xxx.globalpayments.feeds.downstream.DownstreamDataFactoryApplication

2023-07-31 16:18:39.720 [main] INFO  c.p.g.f.d.DownstreamDataFactoryApplication - Started DownstreamDataFactoryApplication in 2.931 seconds (JVM running for 4.313)
2023-07-31 16:18:39.725 [main] DEBUG o.s.b.a.ApplicationAvailabilityBean - Application availability state LivenessState changed to CORRECT
2023-07-31 16:18:39.726 [main] DEBUG c.p.g.f.d.DownstreamDataFactoryApplication - Starting execution
2023-07-31 16:18:39.726 [main] INFO  c.p.g.f.d.DownstreamDataFactoryApplication - args[0]: -Dloader.main=com.pru.globalpayments.feeds.downstream.DownstreamDataFactoryApplication
2023-07-31 16:18:39.728 [main] INFO  c.p.g.f.d.DownstreamDataFactoryApplication - Obtained data: null
2023-07-31 16:18:39.728 [main] INFO  c.p.g.f.d.DownstreamDataFactoryApplication - Processed data:
2023-07-31 16:18:39.729 [main] INFO  c.p.g.f.d.DownstreamDataFactoryApplication - Marshalled data to a file:
2023-07-31 16:18:39.729 [main] INFO  c.p.g.f.d.DownstreamDataFactoryApplication - Marshalled data to a remote location:
2023-07-31 16:18:39.731 [main] DEBUG o.s.b.a.ApplicationAvailabilityBean - Application availability state ReadinessState changed to ACCEPTING_TRAFFIC
2023-07-31 16:18:39.734 [SpringApplicationShutdownHook] DEBUG o.s.c.a.AnnotationConfigApplicationContext - Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@6c130c45, started on Mon Jul 31 16:18:37 EDT 2023
2023-07-31 16:18:39.739 [SpringApplicationShutdownHook] DEBUG o.s.c.s.DefaultLifecycleProcessor - Stopping beans in phase -2147483647
2023-07-31 16:18:39.740 [SpringApplicationShutdownHook] DEBUG o.s.c.s.DefaultLifecycleProcessor - Bean 'springBootLoggingLifecycle' completed its stop procedure

型
我的假设是，org.springframework.boot.loader.PropertiesLauncher本身携带了某些密钥，通过-Dloader.main=AppwithMainMethod进行的无主类调用将依赖于这些密钥，否则就会失败，但情况似乎并非如此。
此PropertiesLauncher参数的正确用例以及一些示例和文档是什么？它是可选的吗？是否需要？是否可以安全地跳过提供它？什么时候？
先谢谢你。