项目场景：

使用 Spring SpringMVC Mybatis 进行整合SSM的过程中，声明一个声明式事务的查询服务，发现无法使用。

@Service
public class EmpServiceImpl implements EmpService {@Autowiredprivate EmpMapper empMapper;@Transactional@Overridepublic List<Emp> selectAll() {return empMapper.selectAll();}
}

    <dependencies><!-- SpringMVC --><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.3.15</version></dependency><!-- Spring 持久化层所需依赖 --><dependency><groupId>org.springframework</groupId><artifactId>spring-orm</artifactId><version>5.3.15</version></dependency><!-- 日志 --><dependency><groupId>ch.qos.logback</groupId><artifactId>logback-classic</artifactId><version>1.2.10</version></dependency><!-- ServletAPI --><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>4.0.1</version><scope>provided</scope></dependency><!-- Spring5和Thymeleaf整合包 --><dependency><groupId>org.thymeleaf</groupId><artifactId>thymeleaf-spring5</artifactId><version>3.0.14.RELEASE</version></dependency><!-- Mybatis核心 --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.7</version></dependency><!-- MySQL驱动 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.19</version></dependency><!-- 数据源 --><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.0.9</version></dependency><!-- junit5 --><dependency><groupId>org.junit.jupiter</groupId><artifactId>junit-jupiter-api</artifactId><version>5.8.2</version><scope>test</scope></dependency><!-- Spring 的测试功能 --><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>5.3.15</version></dependency><!-- Mybatis 和 Spring 的整合包 --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>2.0.7</version></dependency></dependencies>

DEBUG日志

[13:18:32.310] [ERROR] [Druid-ConnectionPool-Create-992196964] [com.alibaba.druid.pool.DruidDataSource] [create connection error, url: jdbc:mysql://localhost:3306/mybatis_exercise?serverTimezone=Asia/Shanghai&amp, errorCode 1251, state 08004]
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Client does not support authentication protocol requested by server; consider upgrading MySQL clientat sun.reflect.GeneratedConstructorAccessor64.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:403)at com.mysql.jdbc.Util.getInstance(Util.java:378)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:985)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:957)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3378)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3310)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:910)at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3810)at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1272)at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1992)at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:720)at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)at sun.reflect.GeneratedConstructorAccessor62.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:403)at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:293)at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:283)at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1464)at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1529)at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2109)
[13:18:32.312] [ERROR] [Druid-ConnectionPool-Create-992196964] [com.alibaba.druid.pool.DruidDataSource] [create connection error, url: jdbc:mysql://localhost:3306/mybatis_exercise?serverTimezone=Asia/Shanghai&amp, errorCode 1251, state 08004]
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Client does not support authentication protocol requested by server; consider upgrading MySQL clientat sun.reflect.GeneratedConstructorAccessor64.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:403)at com.mysql.jdbc.Util.getInstance(Util.java:378)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:985)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:957)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3378)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3310)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:910)at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3810)at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1272)at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1992)at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:720)at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)at sun.reflect.GeneratedConstructorAccessor62.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:403)at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:293)at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:283)at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1464)at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1529)at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2109)
[13:18:32.313] [ERROR] [Druid-ConnectionPool-Create-992196964] [com.alibaba.druid.pool.DruidDataSource] [create connection error, url: jdbc:mysql://localhost:3306/mybatis_exercise?serverTimezone=Asia/Shanghai&amp, errorCode 1251, state 08004]
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Client does not support authentication protocol requested by server; consider upgrading MySQL clientat sun.reflect.GeneratedConstructorAccessor64.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:403)at com.mysql.jdbc.Util.getInstance(Util.java:378)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:985)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:957)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3378)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3310)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:910)at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3810)at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1272)at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1992)at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:720)at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)at sun.reflect.GeneratedConstructorAccessor62.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:403)at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:293)at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:283)at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1464)at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1529)at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2109)

问题描述：

根据网上的debug，发现很可能是mysql版本和mysql-connect-java依赖版本不对应，但是我使用的是mysql版本是8.0+

       <dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.19</version></dependency>

事实上和这个没有关系
2. 使用Junit编写了一个测试类Test,发现能够查询到信息，这事情就变得很迷惑了。
3. 看了测试类的日志后,发现了了是jdbc.properties的driver没有配置好

Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
[13:24:50.787] [WARN ] [main] [com.alibaba.druid.pool.vendor.MySqlValidConnectionChecker] [Cannot resolve com.mysq.jdbc.Connection.ping method.  Will use 'SELECT 1' instead.]

只要在 jdbc.properties 中将 com.mysql.jdbc.Driver 改为com.mysql.cj.jdbc.Driver即可

原因分析：

Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
[13:24:50.787] [WARN ] [main] [com.alibaba.druid.pool.vendor.MySqlValidConnectionChecker] [Cannot resolve com.mysq.jdbc.Connection.ping method.  Will use 'SELECT 1' instead.]

解决方案：

只要在 jdbc.properties 中将 com.mysql.jdbc.Driver 改为com.mysql.cj.jdbc.Driver即可

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【DEBUG】com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Client does not support

项目场景：

问题描述：

原因分析：

解决方案：

【DEBUG】com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Client does not support相关推荐

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