报错

Exception in thread "main" java.sql.SQLException: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:927)
	at com.mysql.jdbc.ConnectionImpl.buildCollationMapping(ConnectionImpl.java:1023)
	at com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3451)
	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2443)
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2213)
	at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:797)
	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:389)
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
	at org.apache.spark.sql.execution.datasources.jdbc.JdbcUtils$$anonfun$createConnectionFactory$2.apply(JdbcUtils.scala:65)
	at org.apache.spark.sql.execution.datasources.jdbc.JdbcUtils$$anonfun$createConnectionFactory$2.apply(JdbcUtils.scala:56)
	at org.apache.spark.sql.DataFrameWriter.jdbc(DataFrameWriter.scala:408)
	at task_hotel01_subjob2$.main(task_hotel01_subjob2.scala:55)
	at task_hotel01_subjob2.main(task_hotel01_subjob2.scala)

解决

主要原因：数据库版本与mysql连接驱动不匹配问题

因为本人本地数据库是mysql 8.x，虚拟机数据库是5.x，用的mysql连接驱动5.x版本，所以本地运行出现此问题，更换为8.x即可。

<!--<dependency>-->
<!--  <groupId>mysql</groupId>-->
<!--  <artifactId>mysql-connector-java</artifactId>-->
<!--  <version>5.1.20</version>-->
<!--</dependency>-->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.11</version>
</dependency>