SpringBoot踩过的坑

其他 2018-11-01 08:51:27 阅读次数: 0
版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/pang_da_xing/article/details/77103614

一直听说SpringBoot开发多快捷多么好是一个小型的分布式框架，不像Spring那样要写繁多的配置文件， 心血来潮本着玩一玩的心态，写下了第一个SpringBoot程序，按照网上的资料看起来很简单嘛，信心满满的就开始干，却没曾想到问题一个一个接踵而来现在来重现下我遇到的几个问题。

首先创建一个maven project 结构如下：

这里写图片描述

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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.main</groupId>
    <artifactId>SpringBoot</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>SpringBoot Maven Webapp</name>
    <url>http://maven.apache.org</url>


      <!-- Inherit defaults from Spring Boot -->  
    <parent>  
        <groupId>org.springframework.boot</groupId>  
        <artifactId>spring-boot-starter-parent</artifactId>  
        <version>1.4.3.BUILD-SNAPSHOT</version>  
    </parent>  

    <!-- Add typical dependencies for a web application -->  
    <dependencies>  
        <dependency>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-starter-web</artifactId>  
        </dependency>  
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.8.2</version>
        </dependency>
    </dependencies>  

    <!-- Package as an executable jar -->  
    <build>  
        <plugins>  
            <plugin>  
                <groupId>org.springframework.boot</groupId>  
                <artifactId>spring-boot-maven-plugin</artifactId>  
            </plugin>  
        </plugins>  
    </build>  

    <!-- Add Spring repositories -->  
    <!-- (you don't need this if you are using a .RELEASE version) -->  
    <repositories>  
        <repository>  
            <id>spring-snapshots</id>  
            <url>http://repo.spring.io/snapshot</url>  
            <snapshots><enabled>true</enabled></snapshots>  
        </repository>  
        <repository>  
            <id>spring-milestones</id>  
            <url>http://repo.spring.io/milestone</url>  
        </repository>  
    </repositories>  
    <pluginRepositories>  
        <pluginRepository>  
            <id>spring-snapshots</id>  
            <url>http://repo.spring.io/snapshot</url>  
        </pluginRepository>  
        <pluginRepository>  
            <id>spring-milestones</id>  
            <url>http://repo.spring.io/milestone</url>  
        </pluginRepository>  
    </pluginRepositories>  
</project>

以上在maven install时候会报错：
[INFO] ————————————————————————
[INFO] BUILD FAILURE
[INFO] ————————————————————————
[INFO] Total time: 4.604s
[INFO] Finished at: Mon Aug 15 18:14:25 CST 2016
[INFO] Final Memory: 22M/226M
[INFO] ————————————————————————
[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.4.0.RELEASE:repackage (default) on project beenoisy-spring-boot-way:
Execution default of goal org.springframework.boot:spring-boot-maven-plugin:1.4.0.RELEASE:
repackage failed: Unable to find a single main class from the following candidates
[
com.beenoisy.springboot.way.BeenoisySpringBootWayApplication,
com.beenoisy.springboot.way.TestConflict
] -> [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

原因是不找到唯一的一个入口类
解决方法 ： 加上

 <properties>
        <start-class>com.beenoisy.springboot.way.BeenoisySpringBootWayApplication</start-class>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

如果这时项目上还有小红叉的话：报错Error parsing lifecycle processing instructions

1.将pom.xml maven clean然后再选择项目名上右键选择maven->update project 再重新install
2. 如果还是报错
可以尝试将项目导出然后删除然后再倒入，我个人没有尝试成功
3、项目上显示个红叉叉，不影响运行，但是对于强迫的人来说受不鸟
通过Window -> Show View -> Problems 将Maven Problems报的这些错直接delete

Application.java

package com.springBoot.main;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

Example.java

package com.springBoot.main;

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@EnableAutoConfiguration
public class Example {
     @RequestMapping("/")  
        String home() {  
            return "Hello World!";  
        }  

        @RequestMapping("/hello/{myName}")  
        String index(@PathVariable String myName) {  
            return "Hello "+myName+"!!!";  
        }  
}

运行Application.java是报错如下：
这里写图片描述

错误的原因是项目中导入了本地tomcat的jar，将tomcat 直接remove就可以了。

最后终于可以愉快的跑起来我的第一个SpringBoot程序了

运行 Application.java


  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::  (v1.4.3.BUILD-SNAPSHOT)

2017-08-11 21:42:28.328  INFO 23900 --- [           main] com.springBoot.main.Application          : Starting Application on DESKTOP-MQSHI7G with PID 23900 (C:\EclipseWorkPlace\SpringBoot\target\classes started by 胖大星 in C:\EclipseWorkPlace\SpringBoot)
2017-08-11 21:42:28.333  INFO 23900 --- [           main] com.springBoot.main.Application          : No active profile set, falling back to default profiles: default
2017-08-11 21:42:28.450  INFO 23900 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@34b7ac2f: startup date [Fri Aug 11 21:42:28 CST 2017]; root of context hierarchy
2017-08-11 21:42:31.268  INFO 23900 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-08-11 21:42:31.303  INFO 23900 --- [           main] o.apache.catalina.core.StandardService   : Starting service Tomcat
2017-08-11 21:42:31.305  INFO 23900 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.6
2017-08-11 21:42:31.483  INFO 23900 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2017-08-11 21:42:31.483  INFO 23900 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 3038 ms
2017-08-11 21:42:31.691  INFO 23900 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'dispatcherServlet' to [/]
2017-08-11 21:42:31.711  INFO 23900 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-08-11 21:42:31.712  INFO 23900 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-08-11 21:42:31.712  INFO 23900 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-08-11 21:42:31.713  INFO 23900 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2017-08-11 21:42:32.101  INFO 23900 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@34b7ac2f: startup date [Fri Aug 11 21:42:28 CST 2017]; root of context hierarchy
2017-08-11 21:42:32.207  INFO 23900 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hello/{myName}]}" onto java.lang.String com.springBoot.main.Example.index(java.lang.String)
2017-08-11 21:42:32.208  INFO 23900 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/]}" onto java.lang.String com.springBoot.main.Example.home()
2017-08-11 21:42:32.212  INFO 23900 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2017-08-11 21:42:32.213  INFO 23900 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2017-08-11 21:42:32.252  INFO 23900 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-08-11 21:42:32.253  INFO 23900 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-08-11 21:42:32.302  INFO 23900 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-08-11 21:42:32.491  INFO 23900 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2017-08-11 21:42:32.540 ERROR 23900 --- [           main] o.a.coyote.http11.Http11NioProtocol      : Failed to start end point associated with ProtocolHandler [http-nio-8080]

java.net.BindException: Address already in use: bind
    at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_101]
    at sun.nio.ch.Net.bind(Net.java:433) ~[na:1.8.0_101]
    at sun.nio.ch.Net.bind(Net.java:425) ~[na:1.8.0_101]
    at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223) ~[na:1.8.0_101]
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) ~[na:1.8.0_101]
    at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:228) ~[tomcat-embed-core-8.5.6.jar:8.5.6]
    at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:874) ~[tomcat-embed-core-8.5.6.jar:8.5.6]
    at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:590) ~[tomcat-embed-core-8.5.6.jar:8.5.6]
    at org.apache.catalina.connector.Connector.startInternal(Connector.java:969) [tomcat-embed-core-8.5.6.jar:8.5.6]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) [tomcat-embed-core-8.5.6.jar:8.5.6]
    at org.apache.catalina.core.StandardService.addConnector(StandardService.java:225) [tomcat-embed-core-8.5.6.jar:8.5.6]
    at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.addPreviouslyRemovedConnectors(TomcatEmbeddedServletContainer.java:233) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.start(TomcatEmbeddedServletContainer.java:178) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.startEmbeddedServletContainer(EmbeddedWebApplicationContext.java:297) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:145) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:545) [spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at com.springBoot.main.Application.main(Application.java:10) [classes/:na]

2017-08-11 21:42:32.542 ERROR 23900 --- [           main] o.apache.catalina.core.StandardService   : Failed to start connector [Connector[HTTP/1.1-8080]]

org.apache.catalina.LifecycleException: Failed to start component [Connector[HTTP/1.1-8080]]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167) ~[tomcat-embed-core-8.5.6.jar:8.5.6]
    at org.apache.catalina.core.StandardService.addConnector(StandardService.java:225) ~[tomcat-embed-core-8.5.6.jar:8.5.6]
    at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.addPreviouslyRemovedConnectors(TomcatEmbeddedServletContainer.java:233) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.start(TomcatEmbeddedServletContainer.java:178) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.startEmbeddedServletContainer(EmbeddedWebApplicationContext.java:297) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:145) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:545) [spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) [spring-boot-1.4.3.BUILD-SNAPSHOT.jar:1.4.3.BUILD-SNAPSHOT]
    at com.springBoot.main.Application.main(Application.java:10) [classes/:na]
Caused by: org.apache.catalina.LifecycleException: service.getName(): "Tomcat";  Protocol handler start failed
    at org.apache.catalina.connector.Connector.startInternal(Connector.java:976) ~[tomcat-embed-core-8.5.6.jar:8.5.6]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ~[tomcat-embed-core-8.5.6.jar:8.5.6]
    ... 13 common frames omitted
Caused by: java.net.BindException: Address already in use: bind
    at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_101]
    at sun.nio.ch.Net.bind(Net.java:433) ~[na:1.8.0_101]
    at sun.nio.ch.Net.bind(Net.java:425) ~[na:1.8.0_101]
    at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223) ~[na:1.8.0_101]
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) ~[na:1.8.0_101]
    at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:228) ~[tomcat-embed-core-8.5.6.jar:8.5.6]
    at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:874) ~[tomcat-embed-core-8.5.6.jar:8.5.6]
    at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:590) ~[tomcat-embed-core-8.5.6.jar:8.5.6]
    at org.apache.catalina.connector.Connector.startInternal(Connector.java:969) ~[tomcat-embed-core-8.5.6.jar:8.5.6]
    ... 14 common frames omitted

2017-08-11 21:42:32.553  INFO 23900 --- [           main] o.apache.catalina.core.StandardService   : Stopping service Tomcat
2017-08-11 21:42:32.566  INFO 23900 --- [           main] utoConfigurationReportLoggingInitializer : 

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-08-11 21:42:32.572 ERROR 23900 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
***************************

Description:

The Tomcat connector configured to listen on port 8080 failed to start. The port may already be in use or the connector may be misconfigured.

Action:

Verify the connector's configuration, identify and stop any process that's listening on port 8080, or configure this application to listen on another port.

2017-08-11 21:42:32.573  INFO 23900 --- [           main] ationConfigEmbeddedWebApplicationContext : Closing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@34b7ac2f: startup date [Fri Aug 11 21:42:28 CST 2017]; root of context hierarchy
2017-08-11 21:42:32.574  INFO 23900 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Unregistering JMX-exposed beans on shutdown

然后直接在浏览器分别访问：http://localhost:8080/
和http://localhost:8080/hello/胖大星
这里写图片描述

这里写图片描述

看似简单的程序，实际操作起来问题却一个接一个。

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