my connection string has the following properties useUnicode=true&characterEncoding=utf8&character_set_server=utf8mb4&charset=utf8mb4
and I used
jpaProperties.put("hibernate.connection.useUnicode", true);
jpaProperties.put("hibernate.connection.characterEncoding", "utf8");
jpaProperties.put("hibernate.connection.CharSet", "utf8mb4");
the DB also supports utf8mb4 since when I add a record manually it saves it correctly
still getting errors when trying to save an emoji
Incorrect string value: '\xF0\x9F\x98\x88\xF0\x9F...' for column 'name' at row 1
I Solved it by upgrading the mysql-connector-java to 5.1.49 and adding the following to the connection string
{connection string}?characterEncoding=UTF-8&useUnicode=true
reference:https://dev.mysql.com/doc/connector-j/5.1/en/connector-j-reference-charsets.html