请尝试将以下配置类添加到您的应用程序，并告诉它是否工作：

/**
 * Enables asynchronous task management. Implements {@link AsyncConfigurer} to allow
 * event publishing operations being executed both synchronously and asynchronously.
 */
@EnableAsync
@Configuration(proxyBeanMethods = false)
public class AsyncConfig implements AsyncConfigurer {

    /*
     * Implementing AsyncConfigurer allows to determine an Executor for asynchronous operations only. This way it is
     * sufficient to simply annotate desired methods with @Async for async treatment, event publishing tasks included.
     *
     * In contrast, providing an ApplicationEventMulticaster would cause all event publishing tasks to be executed
     * asynchronously by default. To be able to execute synchronous tasks nevertheless, we would have to adapt
     * ApplicationEventMulticaster#multicastEvent() accordingly: for example, we could decide by means of a marker
     * interface to which executor the task should get passed (https://stackoverflow.com/a/57929153).
     */

    @Override
    public Executor getAsyncExecutor() {
        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
        taskExecutor.setCorePoolSize(8);
        taskExecutor.setMaxPoolSize(32);
        taskExecutor.setQueueCapacity(64);
        taskExecutor.setThreadNamePrefix("DallasMultipassExecutor-");
        taskExecutor.initialize();
        return taskExecutor;
    }

    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return new SimpleAsyncUncaughtExceptionHandler();
    }

}

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在同一个类中调用@Async方法是行不通的，你必须从不同的类中调用该方法。

如果EmailService有一个sendMail方法，该方法是baseC，则应该直接在businessLogicService类方法中调用它。

BusinessLogicService { 
  foo(){
   emailService.sendMail();
  }
}

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如果在businessLogicService中调用了其他方法，请尝试使用该方法。