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Implementation: Video 10-20 (Video 11-14: Setting UP Java Development…

- - - - Video 28: Exception using WebApplicationException
        
        jaxRS does not understand Exceptions so you have to map to response
        
        JaxRS has own its own set of exceptions mapped already
        
        these exceptions are called WebApplicationException() and it has its own constructors for you to setup stuff
        
        Video 29: Hateoas: create link for self message id
        
        create link class and map it to Message class
        
        in the resource, addlink to Message.links by calling a helper method
        
        add dynamic url to url using getBaseUriBuilder.path(Resource.class)
        
        private String getUriForComments(UriInfo uriInfo, Message message) {
        URI uri = uriInfo.getBaseUriBuilder() //we want base uri .path(MessengerResource.class) .path(MessengerResource.class, "getCommentResource") //URI mapped to resource at the class level: /profiles Look at url located at top of Profile Resource .path(CommentResource.class) .resolveTemplate("messageId", message.getId()) .build(); return uri.toString();
        }
        
        Video 31 Content Negotiation
        
        Client ask server what content to send
        
        Accept Header: text/xml
        
        declare in Api to support both XML/Json using Produces values
        
        different method runs for different Accept header
        
        It's not only what client wants from server but also want client sends to server on POST and PUT body.
        
        In PUT/POST, client uses Content-Type header to tell server what it is sending: This maps to Consumes annotation
        
        Accepts Match **@Produces**
        
        Content-Type Match . **@Cosumes**
        
        MediaType.Application_json is just a static string