{"msg":"\n### Error querying database.  Cause: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure\n\nThe last packet successfully received from the server was 3,520 milliseconds ago. The last packet sent successfully to the server was 6,973 milliseconds ago.\n### The error may exist in class path resource [mybatis/system/DictDataMapper.xml]\n### The error may involve defaultParameterMap\n### The error occurred while setting parameters\n### SQL: select dict_label from sys_dict_data   where dict_type = ? and dict_value = ?\n### Cause: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure\n\nThe last packet successfully received from the server was 3,520 milliseconds ago. The last packet sent successfully to the server was 6,973 milliseconds ago.\n; Communications link failure\n\nThe last packet successfully received from the server was 3,520 milliseconds ago. The last packet sent successfully to the server was 6,973 milliseconds ago.; nested exception is com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure\n\nThe last packet successfully received from the server was 3,520 milliseconds ago. The last packet sent successfully to the server was 6,973 milliseconds ago.","code":500}