SpringBoot踩过的坑
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：
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>4.0.0modelVersion>
<groupId>com.maingroupId>
<artifactId>SpringBootartifactId>
<packaging>warpackaging>
<version>0.0.1-SNAPSHOTversion>
<name>SpringBoot Maven Webappname>
<url>http://maven.apache.orgurl>
<parent>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-parentartifactId>
<version>1.4.3.BUILD-SNAPSHOTversion>
parent>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
<version>4.8.2version>
dependency>
dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
plugin>
plugins>
build>
<repositories>
<repository>
<id>spring-snapshotsid>
<url>http://repo.spring.io/snapshoturl>
<snapshots><enabled>trueenabled>snapshots>
repository>
<repository>
<id>spring-milestonesid>
<url>http://repo.spring.io/milestoneurl>
repository>
repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshotsid>
<url>http://repo.spring.io/snapshoturl>
pluginRepository>
<pluginRepository>
<id>spring-milestonesid>
<url>http://repo.spring.io/milestoneurl>
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
com.beenoisy.springboot.way.BeenoisySpringBootWayApplication
.build.sourceEncoding>UTF-8 .build.sourceEncoding>
.reporting.outputEncoding>UTF-8 .reporting.outputEncoding>
.version>1.8 .version>
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deleteApplication.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：
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> 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
看似简单的程序，实际操作起来问题却一个接一个。