{"code":"999999","msg":"nested exception is org.apache.ibatis.exceptions.PersistenceException: \n### Error querying database.  Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLTransientConnectionException: DatebookHikariCP - Connection is not available, request timed out after 30002ms.\n### The error may exist in me/ixin/aprscc/mapper/LastPacketMapper.java (best guess)\n### The error may involve me.ixin.aprscc.mapper.LastPacketMapper.selectList\n### The error occurred while executing a query\n### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLTransientConnectionException: DatebookHikariCP - Connection is not available, request timed out after 30002ms.","data":null}