错误信息：
1.客户端错误信息：
The error occurred while executing a query ### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLNonTransientConnectionException: CLIENT_PLUGIN_AUTH is required
2.服务端错误日志信息：
2019-09-28 10:05:19.003 ERROR 5364 --- [nio-8080-exec-1] com.alibaba.druid.pool.DruidDataSource : init datasource error, url: jdbc:mysql://localhost:3306/springboottest?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
java.sql.SQLNonTransientConnectionException: Cannot load connection class because of underlying exception: com.mysql.cj.core.exceptions.WrongArgumentException: Malformed database URL, failed to parse the connection string near ';characterEncoding=UTF-8&serverTimezone=UTC'.
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:526) ~[mysql-connector-java-6.0.5.jar:6.0.5]
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:513) ~[mysql-connector-java-6.0.5.jar:6.0.5]
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:505) ~[mysql-connector-java-6.0.5.jar:6.0.5]
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:479) ~[mysql-connector-java-6.0.5.jar:6.0.5]
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:489) ~[mysql-connector-java-6.0.5.jar:6.0.5]
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:72) ~[mysql-connector-java-6.0.5.jar:6.0.5]
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:124) ~[mysql-connector-java-6.0.5.jar:6.0.5]
at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:224) ~[mysql-connector-java-6.0.5.jar:6.0.5]
at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:149) ~[druid-1.1.6.jar:1.1.6]
at com.alibaba.druid.filter.FilterAdapter.connection_connect(FilterAdapter.java:786) ~[druid-1.1.6.jar:1.1.6]
at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:143) ~[druid-1.1.6.jar:1.1.6]
at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:218) ~[druid-1.1.6.jar:1.1.6]
at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:143) ~[druid-1.1.6.jar:1.1.6]
at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1512) ~[druid-1.1.6.jar:1.1.6]
at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1575) ~[druid-1.1.6.jar:1.1.6]
at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:854) [druid-1.1.6.jar:1.1.6]
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1221) [druid-1.1.6.jar:1.1.6]
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1217) [druid-1.1.6.jar:1.1.6]
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:90) [druid-1.1.6.jar:1.1.6]
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111) [spring-jdbc-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77) [spring-jdbc-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:82) [mybatis-spring-1.3.1.jar:1.3.1]
at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:68) [mybatis-spring-1.3.1.jar:1.3.1]
at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:336) [mybatis-3.4.5.jar:3.4.5]
at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:84) [mybatis-3.4.5.jar:3.4.5]
at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62) [mybatis-3.4.5.jar:3.4.5]
at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324) [mybatis-3.4.5.jar:3.4.5]
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156) [mybatis-3.4.5.jar:3.4.5]
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109) [mybatis-3.4.5.jar:3.4.5]
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83) [mybatis-3.4.5.jar:3.4.5]
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148) [mybatis-3.4.5.jar:3.4.5]
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141) [mybatis-3.4.5.jar:3.4.5]
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77) [mybatis-3.4.5.jar:3.4.5]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_131]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_131]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_131]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_131]
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433) [mybatis-spring-1.3.1.jar:1.3.1]
at com.sun.proxy.$Proxy60.selectOne(Unknown Source) [na:na]
at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:166) [mybatis-spring-1.3.1.jar:1.3.1]
at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:82) [mybatis-3.4.5.jar:3.4.5]
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59) [mybatis-3.4.5.jar:3.4.5]
问题排查：
首先查询本地mysql安装版本。版本为5.0.96
而目前工程MySQL驱动为：
6.0.5
是由于版本与驱动版本不一致导致的
解决方法：将驱动6.05改成5.1.40即可
<dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.40</version> </dependency>
