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@Consumes & @Produces [message #988516]

Fri, 30 November 2012 05:38

Janusz Dalecki
Messages: 49
Registered: January 2010
Location: Sydney

Member

Hi all,
I have inherited some jax-rs code to maintain and develop and I am really puzzled by
how does the jax-rs really work.
I have read a few tutorials on jax-rs and I have tried to find out what those two annotations actually mean/do

@Consumes/@Produces.

Could somebody please explain (in a plain language) what they do?
My understanding is (probably far from the truth) that -

@Consumes({ MediaType.APPLICATION_JSON})

means that the jax-rx (jersey) will convert objects passed by any browser into my app as JSON objects (name:value pairs stuff) but the function defined in the class handling the request is like this:

@POST
      @Consumes({ MediaType.APPLICATION_JSON })
      @Produces({ MediaType.APPLICATION_JSON })
      public Product create(final Product prod) {
        prod.setId(null);
        return ...
      }

so it is POJO object (Product), and it works !!! why???
What am I missing???
Regards,
Janusz

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Re: @Consumes & @Produces [message #989371 is a reply to message #988516]

Wed, 05 December 2012 16:20

Gunnar Wagenknecht
Messages: 435
Registered: July 2009

Senior Member

Am 30.11.2012 11:38, schrieb Janusz Dalecki:
> @Consumes({ MediaType.APPLICATION_JSON })
> @Produces({ MediaType.APPLICATION_JSON })
> public Product create(final Product prod) {
> prod.setId(null);
> return ...
> }
>
> so it is POJO object (Product), and it works !!! why???
> What am I missing???

Your assumption is correct.

@Consumes({ MediaType.APPLICATION_JSON }) instructs JAX-RS to accept
JSON input. It then searches for a @Provider that converts JSON into a
Product POJO.

@Produces is the other way around. It takes return values from methods
and uses a @Provider to convert POJOs to JSON.

-Gunnar

--
Gunnar Wagenknecht
gunnar@xxxxxxxx
http://wagenknecht.org/

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