尝试使用在NetBeans上运行的GlassFish服务器连接到MySQL时总是会出现此异常。(com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException) com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Cannot open file:C:\Users\houssam.ayyache\AppData\Roaming\NetBe