由于在运行方法中加载上下文 xml 时缺少 EmbeddedServletContainerFactory bean，因此无法启动 EmbeddedWebApplicationContext

Question

@Configuration
@EnableAutoConfiguration
@ComponentScan
@SpringBootApplication

public class InitService extends SpringBootServletInitializer { 

    public static void main(String[] args) {
    SpringApplication.run("classpath:abc-server.xml", args);
    }
}

++++++++++++++++++++++++++++++++++++++++++++

在这里，我正在尝试将 Spring MVC 项目迁移到带有嵌入式 tomcat 的 Spring boot Standalone jar。所以我尝试加载现有项目中使用的上下文 xml(abc-server.xml)。当我运行/部署 spring boot jar 时，会抛出以下异常。

++++++++++++++++++++++++++++++++++++++++

[2015-05-19 15:12:30,012] ERROR org.springframework.boot.SpringApplication  - Application startup failed
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:133)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:474)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:957)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:946)
at com.gogo.asp.server.init.InitService.main(InitService.java:188)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:53)
at java.lang.Thread.run(Thread.java:745)
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:183)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:156)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:130)
... 13 more

Answer 1

当您调用 run 时，您只是提供 server-abc.xml 作为应用程序配置的来源：

SpringApplication.run("classpath:abc-server.xml", args);

这意味着InitService 将被忽略，包括您已启用自动配置这一事实。如果没有打开自动配置，Spring Boot 不会自动为您配置嵌入式 servlet 容器。您需要同时提供 InitService 和 abc-server.xml 作为应用程序的配置。

我会将InitService.class 提供给SpringApplication.run 并使用@ImportResource 提取您的旧XML 配置：

@SpringBootApplication
@ImportResource("classpath:abc-server.xml")
public class InitService {

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

请注意，@SpringBootApplication 等效于 @ComponentScan、@Configuration 和 @EnableAutoConfiguration。您可以使用@SpringBootApplication 并像我在上面所做的那样删除其他三个注释。