org.apache.ibatis.exceptions.PersistenceException: ### Error opening session. Cause: 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. ### Cause: 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. Exception Context: [1:activity=Transaction] [2:class=com.irti.service.coupon.MarCouponService] [3:method=findCouponsByMerchantId] [4:args={{merchantId=135173969527221}}] [5:info= ### Error opening session. Cause: 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. ### Cause: 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.] [6:code=200] [7:SQLErrorCode=0] [8:SQLState=08S01] [9:SQLMessage=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.] ---------------------------------