我正在使用springboot2.0和tomcat9将war部署到本地机器上的tomcat服务器上。我有servletcontextlistener类来初始化应用程序。应用程序在嵌入式tomcat服务器上运行良好，但是外部tomcat服务器不执行servletcontextlistener类。我没有得到任何错误，tomcat启动时没有任何异常/错误。请告知。
配置类

@NotNull
 @Bean
 ServletListenerRegistrationBean<ServletContextListener> myServletListener() {
 System.out.println("Loading server listener.......................");
 ServletListenerRegistrationBean<ServletContextListener> srb = new 
 ServletListenerRegistrationBean<>();

 srb.setListener(new MyAppServletContextListener());
 return srb;
}

下面的主spring引导类和扩展的springbootservletinitializer使应用程序能够部署到tomcat服务器。

@SpringBootApplication
public class MainSpringBootWebApplication extends SpringBootServletInitializer {

@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder applicationBuilder) {

    Map<String, String> nv = System.getenv();

    String configlocation = nv.get("SPRING_CONFIG_LOCATION");
    String configpath = configlocation + File.separator + "appilcation.properties";

    if(configlocation !=null && !configlocation.isEmpty()) {
        Properties props = new Properties();
        props.setProperty("spring.config.location", configpath);

        applicationBuilder.application().setDefaultProperties(props);
    }
    return applicationBuilder.sources(MainSpringBootWebApplication.class);
}

public static void main(String[] args) {
    SpringApplication.run(MainSpringBootWebApplication.class, args);
}