当前驱动加载路径：/home/newhope/newhopeapp/tomcat_bi/webapps/webroot/WEB-INF/lib/mysql-connector-java-5.1.49-bin.jar 检测驱动 com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
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