Spring boot多模块（moudle）中的一个注入错误（Unable to start embedded container; nested exception is org）

org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean.

    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:137)

    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:536)

    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)

    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737)

    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370)

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:314)

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162)

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151)

    at com.moerlong.platform.service.demo.calculator.application.CalculatorApplication.main(CalculatorApplication.java:25)

Caused by: org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean.

    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.getEmbeddedServletContainerFactory(EmbeddedWebApplicationContext.java:189)

    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:162)

    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:134)

    ... 8 common frames omitted

主模块中需要的bean在另外一个模块中定义，但运行时，无法注入。原因是：

SpringBoot约定的bean搜索路径是从@SrpingBootApplication所在在包开始的，也就是说，所有其它包都必须在这个包之下，否则SpringBoot启动后，其它包无法找到，就会导致以上错误。