java - Spring Boot - 无法启动嵌入式容器

Question

当我启动 springboot 应用程序时，我的 SpringBootLoginController 类抛出此错误(无法启动嵌入式容器)，如下所示。这是一个 hello world 类型的 spring boot 应用程序示例。

   .   ____          _            __ _ _
     /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
    ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
     \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
      '  |____| .__|_| |_|_| |_\__, | / / / /
     =========|_|==============|___/=/_/_/_/
     :: Spring Boot ::        (v1.5.2.RELEASE)

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) ~[spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:536) ~[spring-context-4.3.7.RELEASE.jar:4.3.7.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]

我的 pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.test.springboot</groupId>
    <artifactId>HelloSpringBoot</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    <name>HelloSpringBoot</name>
    <description>HelloSpringBoot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
    </parent>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
</project>

我的 Controller :

import org.springframework.boot.*;
import org.springframework.web.bind.annotation.*;

@RestController
public class SpringBootLoginController {

    @RequestMapping("/hello")
    String hello() {
        return "Hello World!!!";
    }

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

}

Answer 1

使用 @SpringBootApplication 注释解决了这个问题。

@SpringBootApplication
@RestController
public class SpringBootLoginController {

    @RequestMapping("/hello")
    String hello() {
        return "Hello World!!!";
    }

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

或者，通过添加 @EnableAutoConfiguration 、@ComponentScan 和 @Configuration 也可以解决此问题。

@EnableAutoConfiguration
@RestController
public class SpringBootLoginController {

    @RequestMapping("/hello")
    String hello() {
        return "Hello World!!!";
    }

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