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    MySQL doesn't support some types of characters (such as emojis) with the utf8 encoding. You need to be on MySQL 5.5+ and force utf8mb4 (everywhere, client and server). You can do this sending the query "SET NAMES utf8mb4". Check this https://goo.gl/3E2qzg

Solutions on the web

via Stack Overflow by mossaab
, 2 years ago
Operation not allowed after ResultSet closed
via Server Fault by mossaab
, 1 year ago
Operation not allowed after ResultSet closed
via serverfault.com by Unknown author, 2 years ago
via GitHub by yuankui
, 1 year ago
Operation not allowed after ResultSet closed
via mysql.com by Unknown author, 2 years ago
java.sql.SQLException: Operation not allowed after ResultSet closed	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:996)	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:935)	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:924)	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:870)	at com.mysql.jdbc.ResultSetImpl.checkClosed(ResultSetImpl.java:734)	at com.mysql.jdbc.ResultSetImpl.checkRowPos(ResultSetImpl.java:778)	at com.mysql.jdbc.ResultSetImpl.getObject(ResultSetImpl.java:4419)	at com.mypackage.SqlUtils.getResultMapList(SqlUtils.java:66)