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### Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet successfully received from the server was 30,381,120 milliseconds ago. The last packet sent successfully to the server was 4 milliseconds ago. ### The error may exist in file [/home/tomcat/tomcat8/tags_venus/tag_pro_csc_v1.0.0_20231220_1/venus/WEB-INF/classes/com/app/urm/dao/maps/User.xml] ### The error may involve com.app.urm.dao.IUserDao.getProvinces-Inline ### The error occurred while setting parameters ### SQL: SELECT e.provincecode provinceCode,e.province FROM erp_xxcsc_area_v e group by e.provincecode,e.province ### Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet successfully received from the server was 30,381,120 milliseconds ago. The last packet sent successfully to the server was 4 milliseconds ago. ; SQL []; Communications link failure The last packet successfully received from the server was 30,381,120 milliseconds ago. The last packet sent successfully to the server was 4 milliseconds ago.; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet successfully received from the server was 30,381,120 milliseconds ago. The last packet sent successfully to the server was 4 milliseconds ago.