错误显示这个：SQL错误: Could not create connection to database server.
Caused by: java.lang.NullPointerException at com.mysql.jdbc.ConnectionImpl.getServerCharacterEncoding(ConnectionImpl.java:3279) at com.mysql.jdbc.MysqlIO.sendConnectionAttributes(MysqlIO.java:1940) at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1866) at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1252) at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2486) at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2519) ... 76 more 错误日志附件上传了 连接的字符串为：jdbc:mysql://10.17.68.151:3306/robotlog?useOldAliasMetadataBehavior=true&useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull 麻烦老师帮忙看一下是哪里出问题了，谢谢！ | 
