Examples for Chapter 11 - RESTful Java with JAX-RS 2.0 - page 317

cust . setStreet ( update . getStreet ());
cust . setState ( update . getState ());
cust . setZip ( update . getZip ());
cust . setCountry ( update . getCountry ());

builder = Response . noContent ();
return return builder . build ();

}

}

Finally, the update is performed.

The Client Code

The client code first performs a conditional GET. It then tries to do a conditional PUT using
a bad ETag value.

public public class class CustomerResourceTest CustomerResourceTest

{

@Test
public

public void void testCustomerResource () throws throws Exception

{

WebTarget customerTarget =
client . target ( "http://localhost:8080/services/customers/1" );
Response response = customerTarget . request (). get ();
Assert . assertEquals ( 200 , response . getStatus ());
Customer cust = response . readEntity ( Customer . class );

EntityTag etag = response . getEntityTag ();
response . close ();

The testCustomerResource() method starts off by fetching a preinitialized Customer ob-
ject. It does this so that it can obtain the current ETag of the Customer representation.

System . out . println ( "Doing a conditional GET with ETag: "
+ etag . toString ());

response = customerTarget . request ()
. header ( "If-None-Match" , etag ). get ();
Assert . assertEquals ( 304 , response . getStatus ());
response . close ();

This code is performing a conditional GET. We set the If-None-Match header using the pre-
viously fetched ETag value. The client is expecting that the server will return a 304, “Not
Modified,” response.