Failed to obtain JDBC Connection； nested exception is com.mysql.cj.jdbc.exceptions.CommunicationsEx

我的是再宿主机连接虚拟机的时候报的这个错

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)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.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)... 71 common frames omitted
Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failureThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:81)at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:82)at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:68)at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:338)at org.apache.ibatis.executor.ReuseExecutor.prepareStatement(ReuseExecutor.java:88)at org.apache.ibatis.executor.ReuseExecutor.doQuery(ReuseExecutor.java:59)at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:326)at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)... 77 common frames omitted
Caused by: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failureThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174)at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64)at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:835)at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:455)at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:240)at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:207)at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:156)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:1580)at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1644)at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:918)at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1300)at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1296)at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:109)at org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource.getConnection(AbstractRoutingDataSource.java:169)at org.springframework.jdbc.datasource.DataSourceUtils.fetchConnection(DataSourceUtils.java:151)at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:115)at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:78)... 87 common frames omitted
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failureThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61)at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105)at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151)at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167)at com.mysql.cj.protocol.a.NativeProtocol.negotiateSSLConnection(NativeProtocol.java:351)at com.mysql.cj.protocol.a.NativeAuthenticationProvider.negotiateSSLConnection(NativeAuthenticationProvider.java:777)at com.mysql.cj.protocol.a.NativeAuthenticationProvider.proceedHandshakeWithPluggableAuthentication(NativeAuthenticationProvider.java:486)at com.mysql.cj.protocol.a.NativeAuthenticationProvider.connect(NativeAuthenticationProvider.java:202)at com.mysql.cj.protocol.a.NativeProtocol.connect(NativeProtocol.java:1442)at com.mysql.cj.NativeSession.connect(NativeSession.java:165)at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:955)at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:825)... 103 common frames omitted
Caused by: javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)at sun.security.ssl.HandshakeContext.<init>(HandshakeContext.java:171)at sun.security.ssl.ClientHandshakeContext.<init>(ClientHandshakeContext.java:101)at sun.security.ssl.TransportContext.kickstart(TransportContext.java:238)at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:394)at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:373)at com.mysql.cj.protocol.ExportControlled.performTlsHandshake(ExportControlled.java:315)at com.mysql.cj.protocol.StandardSocketFactory.performTlsHandshake(StandardSocketFactory.java:188)at com.mysql.cj.protocol.a.NativeSocketConnection.performTlsHandshake(NativeSocketConnection.java:99)at com.mysql.cj.protocol.a.NativeProtocol.negotiateSSLConnection(NativeProtocol.java:347)... 110 common frames omitted
Disconnected from the target VM, address: '127.0.0.1:61621', transport: 'socket'

。找了半天的错误，最后发现是因为url
jdbc:mysql://192.168.1.103:3306/ry-vue?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=false&serverTimezone=CST
把上面的useSSL改为false即可

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Failed to obtain JDBC Connection； nested exception is com.mysql.cj.jdbc.exceptions.CommunicationsEx

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