Spring boot data rest findby traverson to java object - rest

Question

my URI is
http://localhost:8080/context/my-objects/search/findByCode?code=foo
JSON response:
{
"_embedded" : {
"my-objects" : [ {
"code" : "foo",
"description" : "foo description",
"_links" : {
"self" : {
"href" : "http://localhost:8080/context/my-objects/34"
}
}
} ]
}
}
How can I get a java MyObject with Traverson or RestTemplate?
import org.springframework.hateoas.ResourceSupport;
public class MyObject extends ResourceSupport{
private String code;
private String description;
public String getDescription() {
return description;
}
public void setDescription(final String description) {
this.description = description;
}
public String getCode() {
return code;
}
public void setCode(final String code) {
this.code = code;
}
}
This is my Template. I've also tried with a default one.
{
ObjectMapper mapper = new ObjectMapper();
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
mapper.registerModule(new Jackson2HalModule());
MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
converter.setSupportedMediaTypes(MediaType.parseMediaTypes("application/hal+json"));
converter.setObjectMapper(mapper);
RestTemplate template = new RestTemplate(Collections.<HttpMessageConverter<?>> singletonList(converter));
}
Thx in advance.

Answer 1

I've found the solution. First, create a Resources class:
import org.springframework.hateoas.Resources;
public class MyObjects extends Resources<MyObject> { }
Then it is straightforward:
MyObjects myObjects = template.getForObject("http://localhost:8080/context/my-objects/search/findByCode?code=foo", MyObjects.class);
Attention: the template should support hal+json Media Type.
Or with Traverson:
import org.springframework.hateoas.MediaTypes;
import org.springframework.hateoas.client.Traverson;
Traverson traverson;
try{
traverson = new Traverson(new URI("http://localhost:8080/context"), MediaTypes.HAL_JSON);
Map<String, Object> parameters = new HashMap<String, Object>();
parameters.put("code", "foo");
MyObjects myObjects = traverson.follow("my-objects", "search", "findByCode").withTemplateParameters(
parameters).toObject(MyObjects.class);
} catch (URISyntaxException e) {}
If you don't want to extend your POJO MyObject with ResourceSupport class, your Resources class should be typed with Resource:
import org.springframework.hateoas.Resource;
import org.springframework.hateoas.Resources;
public class MyObjects extends Resources<Resource<MyObject>> { }
(If you don't need links the type parameter may again be MyObject).