場景

SpringBoot項目運行后提示：

詳細提示如下：

### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.] with root causejava.lang.NullPointerException: nullat com.mysql.jdbc.ConnectionImpl.getServerCharacterEncoding(ConnectionImpl.java:3286) ~[mysql-connector-java-5.1.27.jar:na]at com.mysql.jdbc.MysqlIO.sendConnectionAttributes(MysqlIO.java:1987) ~[mysql-connector-java-5.1.27.jar:na]at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1913) ~[mysql-connector-java-5.1.27.jar:na]at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1290) ~[mysql-connector-java-5.1.27.jar:na]at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2493) ~[mysql-connector-java-5.1.27.jar:na]at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2526) ~[mysql-connector-java-5.1.27.jar:na]at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2311) ~[mysql-connector-java-5.1.27.jar:na]at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834) ~[mysql-connector-java-5.1.27.jar:na]at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47) ~[mysql-connector-java-5.1.27.jar:na]at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_181]at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[na:1.8.0_181]at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[na:1.8.0_181]at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[na:1.8.0_181]at com.mysql.jdbc.Util.handleNewInstance(Util.java:411) ~[mysql-connector-java-5.1.27.jar:na]at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416) ~[mysql-connector-java-5.1.27.jar:na]at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:347) ~[mysql-connector-java-5.1.27.jar:na]at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:136) ~[HikariCP-3.2.0.jar:na]at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:369) ~[HikariCP-3.2.0.jar:na]at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:198) ~[HikariCP-3.2.0.jar:na]at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:467) ~[HikariCP-3.2.0.jar:na]at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:541) ~[HikariCP-3.2.0.jar:na]at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115) ~[HikariCP-3.2.0.jar:na]at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) ~[HikariCP-3.2.0.jar:na]

解決

自己項目的mysql驅動的版本與本機安裝的mysql的版本不對應導致，項目所用驅動版本過低。

打開cmd，輸入mysql，可以查看本機安裝的mysql的版本為8.0。

所以找到項目中的pom.xml

將mysql驅動版本修改為：

dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.11</version></dependency>

?

注意：

8.0.11版本的mysql驅動包的driverClass有所變化

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

總結

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