Spring boot启动时报 java.sql.SQLException: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long错误：

java.sql.SQLException: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1074) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:988) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:974) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:919) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.ConnectionImpl.buildCollationMapping(ConnectionImpl.java:1041) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3481) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2445) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2215) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:813) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47) ~[mysql-connector-java-5.1.21.jar:na]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_31]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_31]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_31]
at java.lang.reflect.Constructor.newInstance(Constructor.java:408) ~[na:1.8.0_31]
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:399) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:334) ~[mysql-connector-java-5.1.21.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]
at com.baomidou.mybatisplus.toolkit.GlobalConfigUtils.setMetaData(GlobalConfigUtils.java:187) [mybatis-plus-support-2.2.0.jar:na]

仔细检查了一下，发现是mysql jar包的问题，项目中使用的是5.1.21的版本：

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.21</version>
</dependency>

原来jar包版本和MySQL版本不一致。我本机使用的是mysql8.0版本的，
我的解决方法是把mysql-connector-java-5.1.21改成mysql-connector-java-5.1.46
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.46</version>
</dependency>
保存，启动服务，Ok

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