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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: Unknown system variable 'tx_read_only'	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078)	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4190)	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4122)	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2570)	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2731)	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2812)	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2761)	at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1612)	at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3933)	at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3910)	at com.mysql.jdbc.StatementImpl.execute(StatementImpl.java:757)	at com.mysql.jdbc.StatementImpl.execute(StatementImpl.java:732)	at razorcaseeditor.migration.MysqlMigrator.main(MysqlMigrator.java:42)