Spring Boot问题总结

1.程序包org.springframework.web.bind.annotation不存在

错误描述

执行install命令时报如下错误：

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[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project springboot: Compilation failure: Compilation failure: 
[ERROR] /E:/Project/Eclipse/NINO/springboot/src/main/java/com/nino/springboot/SpringbootApplication.java:[5,47] 程序包org.springframework.web.bind.annotation不存在
[ERROR] /E:/Project/Eclipse/NINO/springboot/src/main/java/com/nino/springboot/SpringbootApplication.java:[6,47] 程序包org.springframework.web.bind.annotation不存在
[ERROR] /E:/Project/Eclipse/NINO/springboot/src/main/java/com/nino/springboot/SpringbootApplication.java:[9,2] 找不到符号
[ERROR]   符号: 类 RestController
[ERROR] /E:/Project/Eclipse/NINO/springboot/src/main/java/com/nino/springboot/SpringbootApplication.java:[12,10] 找不到符号
[ERROR]   符号:   类 RequestMapping
[ERROR]   位置: 类 com.nino.springboot.SpringbootApplication
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

我的pom.xml文件

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<?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.nino</groupId>
    <artifactId>springboot</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springboot</name>
    <description>Demo project for Spring Boot</description>

    <!-- Spring Boot父级依赖，有了它就是个Spring Boot项目了 -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.6.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <!-- Spring Boot Maven插件，提供了很多方便的功能 -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

错误分析

参考了下其它正确的Spring Boot项目，发现是这行配置及代码出错了

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

把它改成如下代码，重新install成功了

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

spring-boot-starter和spring-boot-starter-web的区别：

spring-boot-starter 是Spring Boot的核心启动器，包含了自动配置、日志和YAML
spring-boot-starter-web 支持全栈式Web开发，包括Tomcat和spring-webmvc

Web开发要用后者。

参考

Spring Boot的启动器Starter详解 - chszs的专栏 - CSDN博客
http://blog.csdn.net/chszs/article/details/50610474

2. Unable to start embedded container

问题描述

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2015-12-22 09:30:23.582  INFO 3208 --- [           main] controller.UserController                : No active profile set, falling back to default profiles: default  
2015-12-22 09:30:23.879  INFO 3208 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@12ceb70: startup date [Tue Dec 22 09:30:23 CST 2015]; root of context hierarchy  
2015-12-22 09:30:24.391  WARN 3208 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: 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.  
2015-12-22 09:30:25.211 ERROR 3208 --- [           main] o.s.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) ~[spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]  
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:532) ~[spring-context-4.2.4.RELEASE.jar:4.2.4.RELEASE]  
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) ~[spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]  
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:764) [spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]  
    at org.springframework.boot.SpringApplication.doRun(SpringApplication.java:357) [spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]  
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:305) [spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]  
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1124) [spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]  
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1113) [spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]  
    at controller.UserController.main(UserController.java:28) [classes/:na]  
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:185) ~[spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]  
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:158) ~[spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]  
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:130) ~[spring-boot-1.3.1.RELEASE.jar:1.3.1.RELEASE]  
    ... 8 common frames omitted

错误分析

猜测可能是代码编译问题，尝试重新编译，

于是执行Project-->Clean后无果

然后执行：右击项目-->Maven-->Update Project（Alt+F5 ）解决了。

貌似Maven项目重新编译时使用后者比较好使。

参考

Svn 的 Update 与Maven 的update project 作用有什么区别 - 费曼带我飞 - 博客园
http://www.cnblogs.com/xuyuanjia/p/5706411.html