问题：

今天在运行一个打包好的 jar 项目的时候，报了标题上的这个错误。

具体错误如下：

2022-05-06 16:42:23.534 [main] INFO  com.zer.MyApplication - Starting MyApplication v1.0-SNAPSHOT on yanze with PID 13900 (E:\B_springboot_mybatis-1.0-SNAPSHOT.jar started by 51013 in E:\)
2022-05-06 16:42:23.542 [main] INFO  com.zer.MyApplication - No active profile set, falling back to default profiles: default
2022-05-06 16:42:26.501 [main] INFO  o.s.boot.web.embedded.tomcat.TomcatWebServer - Tomcat initialized with port(s): 8080 (http)
2022-05-06 16:42:26.527 [main] INFO  org.apache.coyote.http11.Http11NioProtocol - Initializing ProtocolHandler ["http-nio-8080"]
2022-05-06 16:42:26.546 [main] INFO  org.apache.catalina.core.StandardService - Starting service [Tomcat]
2022-05-06 16:42:26.547 [main] INFO  org.apache.catalina.core.StandardEngine - Starting Servlet engine: [Apache Tomcat/9.0.27]
2022-05-06 16:42:27.076 [main] INFO  org.apache.jasper.servlet.TldScanner - At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
2022-05-06 16:42:27.455 [main] INFO  o.a.c.core.ContainerBase.[Tomcat].[localhost].[/] - Initializing Spring embedded WebApplicationContext
2022-05-06 16:42:27.457 [main] INFO  org.springframework.web.context.ContextLoader - Root WebApplicationContext: initialization completed in 3805 ms
2022-05-06 16:42:27.680 [main] INFO  c.a.d.s.b.a.DruidDataSourceAutoConfigure - Init DruidDataSource
2022-05-06 16:42:33.788 [main] ERROR com.alibaba.druid.pool.DruidDataSource - init datasource error, url: jdbc:mysql://192.168.21.1:3306/spring?characterEncoding=utf8
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failureThe last packet successfully received from the server was 1,072 milliseconds ago.  The last packet sent successfully to the server was 1,054 milliseconds ago.at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)at java.lang.reflect.Constructor.newInstance(Unknown Source)at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:990)at com.mysql.jdbc.ExportControlled.transformSocketToSSLSocket(ExportControlled.java:201)at com.mysql.jdbc.MysqlIO.negotiateSSLConnection(MysqlIO.java:4869)at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1656)at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1217)at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2189)at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2220)at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2015)at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:768)at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)at java.lang.reflect.Constructor.newInstance(Unknown Source)at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:385)at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:323)at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:156)at com.alibaba.druid.filter.FilterAdapter.connection_connect(FilterAdapter.java:786)at com.alibaba.druid.filter.FilterEventAdapter.connection_connect(FilterEventAdapter.java:38)at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:150)at com.alibaba.druid.filter.FilterAdapter.connection_connect(FilterAdapter.java:786)at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:150)at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:218)at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:150)at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1560)at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1623)at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:861)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)at java.lang.reflect.Method.invoke(Unknown Source)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeCustomInitMethod(AbstractAutowireCapableBeanFactory.java:1904)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1846)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1774)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277)at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1255)at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1175)at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:857)at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:760)at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:509)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1321)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1160)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277)at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1255)at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1175)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireByType(AbstractAutowireCapableBeanFactory.java:1500)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1395)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277)at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1255)at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1175)at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:595)at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:376)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1411)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277)at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1255)at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1175)at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:595)at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:376)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1411)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:847)at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:744)at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:391)at org.springframework.boot.SpringApplication.run(SpringApplication.java:312)at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)at org.springframework.boot.SpringApplication.run(SpringApplication.java:1204)at com.zer.MyApplication.main(MyApplication.java:17)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)at java.lang.reflect.Method.invoke(Unknown Source)at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)at org.springframework.boot.loader.Launcher.launch(Launcher.java:51)at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52)
Caused by: javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)at sun.security.ssl.HandshakeContext.<init>(Unknown Source)at sun.security.ssl.ClientHandshakeContext.<init>(Unknown Source)at sun.security.ssl.TransportContext.kickstart(Unknown Source)at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)at com.mysql.jdbc.ExportControlled.transformSocketToSSLSocket(ExportControlled.java:186)... 108 common frames omitted
2022-05-06 16:42:33.798 [main] ERROR com.alibaba.druid.pool.DruidDataSource - {dataSource-1} init error
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

解决：

出现这种错误的情况如下：

  1. 数据库连接长时间没有使用，断开连接之后再去连接，就会出现这种情况。
  2. 数据库连接的后缀参数问题。

我是属于第二种：数据库连接的后缀参数问题。

解决方案：

因为我使用的mysql版本是5.7的，驱动Driver使用的是：com.mysql.jdbc.Driver，

所以，必须要在连接的url后面添加 useSSL=false 即可。

$useSSL=false

解决这个问题，参考的是这篇文章，针对这次的错误，所以做一个记录。

如果是第一种情况，请参考参考文章：参考文章

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