Spring框架无法启动嵌入式容器

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Spring框架无法启动嵌入式容器

我在跟随《Spring实战》第四版第五章的内容,但是我在第一个示例中卡住了。

这是我的Eclipse Luna项目结构:

project structure

如果我将这个项目作为Spring Boot应用程序运行,那么会抛出异常:

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

我该如何解决这个问题?

所有文件的内容如下:

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:

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:

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:

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:

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:

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page session="false" %>


Spittr
" >


Welcome to Spittr

">Spittles | ">Register

pom.xml



    4.0.0
    com.spittr
    spittr
    0.0.1-SNAPSHOT
    jar
    spittr
    Demo project for Spring Boot
    
        org.springframework.boot
        spring-boot-starter-parent
        1.2.4.RELEASE
         
    
    
        UTF-8
        1.8
    
    
        
            org.springframework.boot
            spring-boot-starter
        
        
            org.springframework
            spring-webmvc
        
        
            javax.servlet
            javax.servlet-api
            provided
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
    
    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

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0 Comments

如果您正在使用另一个应用程序监听与Tomcat相同的端口,这也可能是问题的原因。

解决方法:修改另一个应用程序的端口,确保与Tomcat监听的端口不冲突。

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0 Comments

使用Spring Boot时,不应直接包含其他Spring依赖项,而是依靠Boot自己的依赖管理。使用提供的“starters”,可以确保所有需要的库都会以匹配的版本进行包含。

在pom.xml中,不要包含spring-mvc的artifact:

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
</dependency>

而是使用专门为web应用程序提供的Boot starter,即spring-boot-starter-web:

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

更多细节请参考官方指南


我认为pom.xml的其他部分也是多余的(spring-boot-starter,javax.servlet-api,spring-boot-maven-plugin)

感谢您的解决方案,它不会再抛出此异常,但我仍然无法获取所需的页面,当在浏览器中输入localhost:8080时,出现错误页面,显示:"This application has no explicit mapping for /error, so you are seeing this as a fallback. Sat Jun 20 14:56:10 PDT 2015 There was an unexpected error (type=Not Found, status=404). /WEB-INF/views/home.jsp" 这还是一个与Maven相关的问题吗?

将views文件夹移动到src/main/resources。存储模板的WEB-INF文件夹将不会被打包,并且在运行应用程序时不会在类路径中。

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