Java Spring框架无法启动嵌入式容器
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Spring framework unable to start embedded container
提问by Bamqf
I'm following Spring in Action 4th Edition Chapter 5, but I'm stuck at the very first example.
我正在关注 Spring in Action 第 4 版第 5 章，但我被困在第一个示例中。
Here is my Eclipse Luna project structure:
这是我的 Eclipse Luna 项目结构：
If I run this project as Spring Boot App, then it throws exceptions:
如果我将此项目作为 Spring Boot App 运行，则会引发异常：
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 spittr.SpittrApplication.main(SpittrApplication.java:10)
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)
... 7 common frames omitted
How can I fix this problem?
我该如何解决这个问题？
Contents of all files:
所有文件的内容：
SpittrApplication.java:
SpittrApplication.java：
package spittr;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class SpittrApplication {
public static void main(String[] args) {
SpringApplication.run(SpittrApplication.class, args);
}
}
SpittrWebAppInitializer.java:
SpittrWebAppInitializer.java：
package spittr.config;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
public class SpittrWebAppInitializer extends
AbstractAnnotationConfigDispatcherServletInitializer {
@Override
protected String[] getServletMappings() {
return new String[] { "/" };
}
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class<?>[] { RootConfig.class };
}
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class<?>[] { WebConfig.class };
}
}
WebConfig.java:
WebConfig.java：
package spittr.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
@Configuration
@EnableWebMvc
@ComponentScan("spittr.web")
public class WebConfig extends WebMvcConfigurerAdapter {
@Bean
public ViewResolver viewResolver() {
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix("/WEB-INF/views/");
resolver.setSuffix(".jsp");
resolver.setExposeContextBeansAsAttributes(true);
return resolver;
}
@Override
public void configureDefaultServletHandling(
DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
}
RootConfig.java:
RootConfig.java:
package spittr.config;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
@Configuration
@ComponentScan(basePackages = { "spitter" }, excludeFilters = { @Filter(type = FilterType.ANNOTATION, value = EnableWebMvc.class) })
public class RootConfig {
}
HomeController.java:
HomeController.java：
package spittr.web;
import static org.springframework.web.bind.annotation.RequestMethod.*;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
@Controller
public class HomeController {
@RequestMapping(value = "/", method = GET)
public String home() {
return "home";
}
}
home.jsp:
主页.jsp：
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page session="false" %>
<html>
<head>
<title>Spittr</title>
<link rel="stylesheet"
type="text/css"
href="<c:url value="/resources/style.css" />" >
</head>
<body>
<h1>Welcome to Spittr</h1>
<a href="<c:url value="/spittles" />">Spittles</a> |
<a href="<c:url value="/spitter/register" />">Register</a>
</body>
</html>
pom.xml
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<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.spittr</groupId>
<artifactId>spittr</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>spittr</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.2.4.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
采纳答案by kryger
When using Spring Boot you should not include the other Spring dependencies directly, but rely on Boot's own dependency management. When using the provided "starters" you can be sure that all needed libraries will be included in a matching version.
在使用 Spring Boot 时，您不应直接包含其他 Spring 依赖项，而应依赖 Boot 自身的依赖项管理。使用提供的“入门”时，您可以确保所有需要的库都包含在匹配的版本中。
Instead of including spring-mvcartifact in your pom.xml:
而不是spring-mvc在您的 pom.xml中包含工件：
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
</dependency>
use the dedicated Boot starter for webapps, spring-boot-starter-web:
使用专用引导启动器的webapps， spring-boot-starter-web：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
More details in the the official guide
官方指南中的更多详细信息
I believe other parts of your pom.xml are superfluous as well (spring-boot-starter, javax.servlet-api, spring-boot-maven-plugin)
我相信你的 pom.xml 的其他部分也是多余的（spring-boot-starter、javax.servlet-api、spring-boot-maven-plugin）
回答by Khasan 24-7
If You are using another application which listens to the port that is the same as Tomcat listens, this may also be the problem.
如果您使用的另一个应用程序侦听的端口与 Tomcat 侦听的端口相同，则这也可能是问题所在。
