Error: Data too long for column 'image' at row 1 with MySQL medium column

I am storing images that range from 1mb and maximum 7mb in a MySQL database. For this I have created a table with a field of type MEDIUMBLOB that has a capacity of 16,777,215 bytes which is the same 16mb. When I save images of up to 2.2mb it is stored perfectly, but when I save larger images but that do not exceed 7mb I get the following error:

  

com.mysql.jdbc.MysqlDataTruncation: Data truncation: Data too long   for column 'image' at row 1

This is the definition of the image field in my entity Image:

@Entity
@Access(AccessType.FIELD)
@Table(name = "Imagen")
@XmlRootElement
public class Imagen implements Serializable {
    // otros campos
    @Lob
    @Column(name = "imagen", columnDefinition = "mediumblob")
    private byte[] imagen;

   // getters and setters
}

The table Image:

     CREATE TABLE Imagen (
        id INT(10) NOT NULL AUTO_INCREMENT,
        -- Otros campos
        imagen MEDIUMBLOB,
        type VARCHAR(10) COLLATE UTF8_SPANISH_CI,
        PRIMARY KEY (id)
    );

For query and persistence operations use spring-data-jpa.

Note: The development environment is maven + javafx + spring + mysql