SpringCloud开源项目实战

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架构

项目调用关系

所有服务对外提供服务原则上全都从gateway出，进行统一管理和控制。

前端项目SpringCloud-Admin

项目地址

github.com/zhoutaoo/Sp…

启动前端项目

步骤

1.下载
2.安装依赖
3.启动

命令

# 克隆项目
git clone https://github.com/zhoutaoo/springcloud-admin.git

# 安装依赖
npm install
   
# 建议不要用cnpm安装 会有各种诡异的bug 可以通过如下操作解决 npm 下载速度慢的问题
npm install --registry=https://registry.npm.taobao.org

# 启动服务
npm run dev

启动日志

gongzhihaodeMacBook-Pro:SpringCloud-Admin-zhoutaoo gongzhihao$ npm run dev

> springcloud-admin@0.0.1 dev /Users/gongzhihao/IdeaProjects/SpringCloud-Admin-zhoutaoo
> vue-cli-service serve

 INFO  Starting development server...
 10% building 2/2 modules 0 activeℹ ｢wds｣: Project is running at http://localhost:9527/
ℹ ｢wds｣: webpack output is served from /
ℹ ｢wds｣: Content not from webpack is served from /Users/gongzhihao/IdeaProjects/SpringCloud-Admin-zhoutaoo/public
ℹ ｢wds｣: 404s will fallback to /index.html                                                                                                                                                            98% after emitting CopyPlugin                                                      
 DONE  Compiled successfully in 9235ms                                                                                                                                                                                      10:30:02 AM
                                                                                                                                                                                                                                       
  App running at:
  - Local:   http://localhost:9527/ 
  - Network: http://192.168.168.104:9527/

  Note that the development build is not optimized.
  To create a production build, run npm run build.

浏览器访问

http://localhost:9527

登陆 报错信息

Proxy error: Could not proxy request /authorization-server/oauth/token?username=admin&password=password&grant_type=password&scope=read from localhost:9527 to http://127.0.0.1:8443.
See https://nodejs.org/api/errors.html#errors_common_system_errors for more information (ECONNREFUSED).

原因分析

authorization-server项目没有启动。

网关项目

gateway-web

项目地址

github.com/zhoutaoo/Sp…

启动

直接启动即可。

启动报错

idea里，这个module，有问题，没有jar。手动添加jar，又多版本jar共存，导致各种问题。

解决方法，使用eclipse。

Exception in thread "main" java.lang.IllegalArgumentException: Cannot instantiate interface org.springframework.context.ApplicationListener : org.springframework.boot.cloud.CloudFoundryVcapEnvironmentPostProcessor
	at org.springframework.boot.SpringApplication.createSpringFactoriesInstances(SpringApplication.java:450)
	at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:429)
	at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:420)
	at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:270)
	at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:249)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
	at com.springboot.cloud.gateway.GatewayApplication.main(GatewayApplication.java:19)
Caused by: java.lang.IllegalArgumentException: class org.springframework.boot.cloud.CloudFoundryVcapEnvironmentPostProcessor is not assignable to interface org.springframework.context.ApplicationListener
	at org.springframework.util.Assert.assignableCheckFailed(Assert.java:655)
	at org.springframework.util.Assert.isAssignable(Assert.java:586)
	at org.springframework.util.Assert.isAssignable(Assert.java:617)
	at org.springframework.boot.SpringApplication.createSpringFactoriesInstances(SpringApplication.java:443)
	... 7 more
Disconnected from the target VM, address: '127.0.0.1:56857', transport: 'socket'

Process finished with exit code 1

原因分析：多个不同版本的jar。

解决方法：spring-boot，构建路径里，只保留一个pom.xml里配置的版本。

参考：stackoverflow.com/questions/3…

Exception in thread "restartedMain" java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: java.lang.AbstractMethodError
	at org.springframework.context.event.AbstractApplicationEventMulticaster.supportsEvent(AbstractApplicationEventMulticaster.java:271)
	at org.springframework.context.event.AbstractApplicationEventMulticaster.retrieveApplicationListeners(AbstractApplicationEventMulticaster.java:202)
	at org.springframework.context.event.AbstractApplicationEventMulticaster.getApplicationListeners(AbstractApplicationEventMulticaster.java:173)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:87)
	at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:75)
	at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:54)
	at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:347)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:306)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
	at com.springboot.cloud.gateway.GatewayApplication.main(GatewayApplication.java:19)
	... 5 more

还是多版本jar。

java.lang.NoClassDefFoundError: org/springframework/core/annotation/MergedAnnotations$SearchStrategy
	at org.springframework.boot.BeanDefinitionLoader.isComponent(BeanDefinitionLoader.java:279) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.BeanDefinitionLoader.load(BeanDefinitionLoader.java:156) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.BeanDefinitionLoader.load(BeanDefinitionLoader.java:136) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.BeanDefinitionLoader.load(BeanDefinitionLoader.java:128) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.SpringApplication.load(SpringApplication.java:691) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.SpringApplication.prepareContext(SpringApplication.java:392) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:140) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.cloud.bootstrap.BootstrapApplicationListener.bootstrapServiceContext(BootstrapApplicationListener.java:206) [spring-cloud-context-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:117) [spring-cloud-context-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:74) [spring-cloud-context-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) [spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) [spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) [spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127) [spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:76) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:345) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:308) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at com.springboot.cloud.gateway.GatewayApplication.main(GatewayApplication.java:19) [classes/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.1.4.RELEASE.jar:2.1.4.RELEASE]
Caused by: java.lang.ClassNotFoundException: org.springframework.core.annotation.MergedAnnotations$SearchStrategy
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_181]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_181]
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) ~[na:1.8.0_181]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_181]
	... 27 common frames omitted

2020-02-19 01:16:33.417 ERROR [gateway-web,,,] 34510 --- [  restartedMain] o.s.boot.SpringApplication               : Application run failed

java.lang.NoClassDefFoundError: org/springframework/core/annotation/MergedAnnotations$SearchStrategy
	at org.springframework.boot.BeanDefinitionLoader.isComponent(BeanDefinitionLoader.java:279) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.BeanDefinitionLoader.load(BeanDefinitionLoader.java:156) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.BeanDefinitionLoader.load(BeanDefinitionLoader.java:136) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.BeanDefinitionLoader.load(BeanDefinitionLoader.java:128) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.SpringApplication.load(SpringApplication.java:691) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.SpringApplication.prepareContext(SpringApplication.java:392) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:140) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.cloud.bootstrap.BootstrapApplicationListener.bootstrapServiceContext(BootstrapApplicationListener.java:206) ~[spring-cloud-context-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:117) ~[spring-cloud-context-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:74) ~[spring-cloud-context-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:76) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53) ~[spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:345) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:308) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at com.springboot.cloud.gateway.GatewayApplication.main(GatewayApplication.java:19) [classes/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.1.4.RELEASE.jar:2.1.4.RELEASE]
Caused by: java.lang.ClassNotFoundException: org.springframework.core.annotation.MergedAnnotations$SearchStrategy
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_181]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_181]
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) ~[na:1.8.0_181]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_181]
	... 27 common frames omitted

少了jar。多版本，保留的那个版本，一定要和配置pom.xml里的一致。

Exception in thread "restartedMain" java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: java.lang.AbstractMethodError: org.springframework.boot.context.config.ConfigFileApplicationListener.supportsSourceType(Ljava/lang/Class;)Z
	at org.springframework.context.event.GenericApplicationListenerAdapter.supportsSourceType(GenericApplicationListenerAdapter.java:81)
	at org.springframework.context.event.AbstractApplicationEventMulticaster.supportsEvent(AbstractApplicationEventMulticaster.java:294)
	at org.springframework.context.event.AbstractApplicationEventMulticaster.retrieveApplicationListeners(AbstractApplicationEventMulticaster.java:224)
	at org.springframework.context.event.AbstractApplicationEventMulticaster.getApplicationListeners(AbstractApplicationEventMulticaster.java:195)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:133)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127)
	at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:75)
	at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:54)
	at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:347)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:306)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
	at com.springboot.cloud.gateway.GatewayApplication.main(GatewayApplication.java:19)
	... 5 more

要先启动redis，否则启动报错连接不到redis。

gateway-admin

项目地址

github.com/zhoutaoo/Sp…

启动

直接启动即可。

启动报错

创建不了数据库连接。

2020-02-18 22:23:14.845 ERROR [gateway-admin,,,] 31269 --- [reate-975298175] com.alibaba.druid.pool.DruidDataSource   : create connection SQLException, url: jdbc:mysql://localhost:3306/sc_gateway?characterEncoding=UTF-8&useUnicode=true&useSSL=false, errorCode 0, state 08001

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
	at sun.reflect.GeneratedConstructorAccessor66.newInstance(Unknown Source) ~[na:na]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_181]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_181]
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:404) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at com.mysql.jdbc.Util.getInstance(Util.java:387) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:917) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:896) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:885) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2330) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2083) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:806) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at sun.reflect.GeneratedConstructorAccessor63.newInstance(Unknown Source) ~[na:na]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_181]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_181]
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:404) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:410) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:328) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:149) ~[druid-1.1.9.jar:1.1.9]
	at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:218) ~[druid-1.1.9.jar:1.1.9]
	at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:143) ~[druid-1.1.9.jar:1.1.9]
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1515) ~[druid-1.1.9.jar:1.1.9]
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1578) ~[druid-1.1.9.jar:1.1.9]
	at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2466) ~[druid-1.1.9.jar:1.1.9]
Caused by: java.lang.NullPointerException: null
	at com.mysql.jdbc.ConnectionImpl.getServerCharset(ConnectionImpl.java:2997) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at com.mysql.jdbc.MysqlIO.sendConnectionAttributes(MysqlIO.java:1936) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1865) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1228) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2253) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2284) ~[mysql-connector-java-5.1.39.jar:5.1.39]
	... 15 common frames omitted

原因分析：mysql jdbc jar版本不匹配，因为mysql是8，但是jdbc是5，就会报错。

解决方法：jdbc改为8。

参考：stackoverflow.com/questions/5…

授权项目authorization-server

项目地址

github.com/zhoutaoo/Sp…

启动步骤

1.执行sql
2.启动

访问地址

http://localhost:8000

登陆

用户名密码

username: admin

password: password

鉴权项目authentication-server

项目地址

github.com/zhoutaoo/Sp…

启动

直接启动即可。

访问地址

启动-报错

消息中间件的错误。原因是没有启动消息中间件。

版本对应关系

springcloud-2.1.X

2.1.4-springboot

5.1.6-spring

类找不到

1.有的时候看cause，最后一个类找不到

2.有的时候看一个类找不到

不管哪一种，原因都是版本冲突，要么就算版本不存在。

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