MsgBodyReaderExample.java

@Path({id}/tweet)
@POST
@Consumes("application/json")
public Response postTweet(Tweet aTweet){
	//Tweet is a custom domain object
}

@Provider
@Consumes("application/json")
public TweetReader implements MessageBodyReader<Tweet>{
	@Override
	public Tweet readFrom(Class<Tweet> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String,String> headers, InputStream payload){
		//use the InputStream (e.g. Tweet in form of JSON payload) and convert it into the domain representation of a Tweet
		//which will then be injected into the postTweet method
		
		Tweet domainObj = .... ;
		return domainObj;
	}
	
	@Override
	public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType){
		//use the contextual info - type, genericType and mediaType to determine if this message body reader can actually return the desired Java type
		return true;
	}
			
}