{"return_code":500,"return_message":"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.SQLNonTransientConnectionException: Socket fail to connect to host:address=(host=db)(port=3306)(type=primary). db\n### The error may exist in URL [jar:file:/app/target/ROOT-0.0.1-SNAPSHOT.war!/WEB-INF/classes!/sqlMapper/PopupMapper.xml]\n### The error may involve popup.getViewList\n### The error occurred while executing a query\n### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLNonTransientConnectionException: Socket fail to connect to host:address=(host=db)(port=3306)(type=primary). db"}