There are a number of ways in which we can configure converters. It all depends on which one you prefer or how much control you want to achieve.

1. Let's add ByteArrayHttpMessageConverter as @Bean to our WebConfiguration class in the following manner:

@Bean 
public  
  ByteArrayHttpMessageConverter  
    byteArrayHttpMessageConverter() { 
  return new ByteArrayHttpMessageConverter(); 
} 

2. Another way to achieve this is to override the configureMessageConverters method in the WebConfiguration class, which extends WebMvcConfigurerAdapter, defining such a method as follows:

@Override 
public void configureMessageConverters
            (List<HttpMessageConverter<?>> converters) { 
  converters.add(new ByteArrayHttpMessageConverter()); 
}

3. If you want to have a bit more control, we can override the extendMessageConverters method in the following way:

@Override 
public void extendMessageConverters
            (List<HttpMessageConverter<?>> converters) { 
  converters.clear(); 
  converters.add(new ByteArrayHttpMessageConverter()); 
}