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  1. ,
    Expert tip

    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

  2. ,

    Make sure you are using InnoDB storage engine and READ-COMMITTED transaction isolation level and increase the database server innodb_lock_wait_timeout variable to about 500.

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java.sql.SQLException: Before start of result set	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:963)	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:896)	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:885)	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860)	at com.mysql.jdbc.ResultSetImpl.checkRowPos(ResultSetImpl.java:790)	at com.mysql.jdbc.UpdatableResultSet.checkRowPos(UpdatableResultSet.java:214)	at com.mysql.jdbc.ResultSetImpl.getObject(ResultSetImpl.java:4432)	at Main.main(Main.java:38)