spring boot项目使用外部tomcat启动失败总结

dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-tomcat</artifactId>
   <scope>provided</scope>
</dependency>

public class ServletInitializer extends SpringBootServletInitializer {

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        // 传入SpringBoot的主程序类
        return builder.sources(SbdemoApplication.class);
    }
}