【已解决】报错原因：java.math.BigInteger cannot be cast to java.lang.Long

报错原因如下：

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)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:988)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:974)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:919)
	at com.mysql.jdbc.ConnectionImpl.buildCollationMapping(ConnectionImpl.java:1062)
	at com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3556)
	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2513)
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2283)
	at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:822)
	at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
	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.jdbc.Util.handleNewInstance(Util.java:411)
	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:404)
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:317)
	at java.sql.DriverManager.getConnection(DriverManager.java:664)
	at java.sql.DriverManager.getConnection(DriverManager.java:247)
	at com.bjpowernode.jdbc.JDBCTest06.login(JDBCTest06.java:44)
	at com.bjpowernode.jdbc.JDBCTest06.main(JDBCTest06.java:14)

排查：
原因是因为数据库版本（mysql 8.0.15）和数据库驱动jar包版本（mysql-connector-java-5.1.23）匹配不上！！！

C:\Users\51572>mysql --version
mysql  Ver 8.0.15 for Win64 on x86_64 (MySQL Community Server - GPL)

解决方案：
版本匹配上！！！所以我将java程序中使用的数据库驱动版本改为mysql-connector-java-8.0.15。
完美解决！但是注意数据库驱动8.0.15连接时url记得跟上时区设置！看我另一篇文章有解决方案！