To store and display emoji expressions correctly, you must use the utf8mb4 character set uniformly across clients and session connections.
• Configuring clients: Ensure that the character set of the string output by the client is utf8mb4. This can be realized by setting the character set encoding of the client. Make sure that the output data is sent to the MySQL instance with utf8mb4 encoding.
• Configuring session connections: Ensure that the session connected to the RDS instance supports the utf8mb4 character set. For example, if you want to use a JDBC connection, use MySQL Connector/J 5.1.13 or a later version. Do not configure the characterEncoding option in the connection string.