[Demonstration 1]

[Buggy Method]
@Bean
public MessageSource messageSource() {
    final ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
    messageSource.setBasename("/resources/i18n/messages");
    messageSource.setDefaultEncoding(StandardCharsets.ISO_8859_1.displayName());
    return messageSource;
}

[Buggy Hunk]
messageSource.setDefaultEncoding(StandardCharsets.ISO_8859_1.displayName());

[Patch]
messageSource.setDefaultEncoding(StandardCharsets.UTF_8.displayName());

[Demonstration 2]

[Buggy Method]
public static void FlyAndLoadProductTo(Drone drone, Warehouse warehouse, Product product, int quantity) {
    outputList += "" + drone.id + " L " + product.id + " " + warehouse.id + " " + quantity;
}

[Buggy Hunk]
outputList += "" + drone.id + " L " + product.id + " " + warehouse.id + " " + quantity;

[Patch]
outputList.add( "" + drone.id + " L " + product.id + " " + warehouse.id + " " + quantity);