java Exception

问题一：

Caused by: java.sql.SQLException: Unknown system variable 'tx_read_only'：  

mysql-connector-java.jar 和mysql有冲突导致。

本人:驱动为5.1.8，mysql数据库为  6.0.10-alpha-community

问题二：org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown character set: 'utf8mb4'

可能原因字符集问题：修改mysql驱动，我把用的mysql-connector-java5.1.36改为mysql-connector-java5.1.6然后问题得到解决