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
You have a different solution? A short tip here would help you and many other users who saw this issue last week.
- java.sql.SQLException: Incorrect string value: '\xE3\x81\xAB\xE3\x81\x82...' for column 'DATA' at row 1 at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078)