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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

  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.

Solutions on the web

via Stack Overflow by Aby Jacob
, 1 year ago
Column 'QUESTION_DATA' not found.
via GitHub by bran4he
, 11 months ago
via Stack Overflow by stan
, 1 year ago
via by Unknown author, 2 years ago
Column count doesn't match value count at row 1
via by Unknown author, 2 years ago
via Stack Overflow by user1072692
, 6 months ago
Incorrect string value: '\xEF\xBF\xBD' for column 'start' at row 1
java.sql.SQLException: Column 'QUESTION_DATA' not found.	at com.mysql.jdbc.SQLError.createSQLException(