Jersey ClientResponse.getEntity of generic type
I got a problem to deserialize using jeresy ClientRespone.getEntity
I've tried to follow some tutorials and questions, include this: http://jersey.576304.n2.nabble.com/How-can-I-parse-a-java-util-List-lt-gt-Is-it-supported-by-the-Jersey-client-td2300852.html https://jersey.java.net/nonav/documentation/1.5/json.html http://www.programcreek.com/java-api-examples/index.php?api=com.sun.jersey.api.client.GenericType
and i still got the same exception over and over again..
My goal is: instead of:
response.getEntity(String.class); --> {"name":"Ben","type":"The man","id":0}
and then parse it (using Jackson for example), I want to get the entity into my POJO object.
this is my tryings so far:
ServerSide:
@POST
@Path("/account") // route to a specific method.re
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public Response saveDataIntoHash(Account account) {
Account createdAccount = new Account(account.getName(), account.getType());
accountHash.put(createdAccount.getID(), createdAccount);
return Response.status(201).entity(new AccountResponse(createdAccount.getID())).build();
}
Server side Account Class:
private String name;
private String type;
private int ID;
private static int classID = 0;
public Account(String name, String type) {
this.name = name;
this.type = type;
this.ID = classID++;
}
public Account() {
}
public void setName(String name) { this.name = name; }
public String getName() { return name; }
public void setType(String type) { this.type = type; }
public String getType() { return type; }
public int getID() {
return ID;
}
public void setID(int ID) {
this.ID = ID;
}
public static int getClassID() {
return classID;
}
public static void setClassID(int classID) {
Account.classID = classID;
}
ClientSide
private static void getToRestPartner(Client client) {
WebResource webResource = client.resource("http://localhost:8080/RESTfulExample/rest/account/0");
ClientResponse response = webResource.type("application/json").get(ClientResponse.class);
if (!(response.getStatus() == 201 || response.getStatus() == 200)) {
throw new RuntimeException("Failed : HTTP error code : " + response.getStatus());
}
System.out.println("Output from Server .... \n");
List<Account> accountList = response.getEntity(new GenericType<List<Account>>() {
});
System.out.println(accountList.size());
}
Client Account class:
@XmlRootElement
public class Account {
@XmlElement
private String name;
@XmlElement
private String type;
@XmlElement
private int id;
public Account(String name, String type, Integer id) {
this.name = name;
this.type = type;
this.id = id;
}
public Account() {
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
It throws this exception:
Dec 7, 2014 12:15:58 PM com.sun.jersey.api.client.ClientResponse getEntity
SEVERE: A message body reader for Java class java.util.List, and Java type java.util.List<Account>, and MIME media type application/json was not found
Dec 7, 2014 12:15:58 PM com.sun.jersey.api.client.ClientResponse getEntity
SEVERE: The registered message body readers compatible with the MIME media type are:
*/* ->
com.sun.jersey.core.impl.provider.entity.FormProvider
com.sun.jersey.core.impl.provider.entity.StringProvider
com.sun.jersey.core.impl.provider.entity.ByteArrayProvider
com.sun.jersey.core.impl.provider.entity.FileProvider
com.sun.jersey.core.impl.provider.entity.InputStreamProvider
com.sun.jersey.core.impl.provider.entity.DataSourceProvider
com.sun.jersey.core.impl.provider.entity.XMLJAXBElementProvider$General
com.sun.jersey.core.impl.provider.entity.ReaderProvider
com.sun.jersey.core.impl.provider.entity.DocumentProvider
com.sun.jersey.core.impl.provider.entity.SourceProvider$StreamSourceReader
com.sun.jersey.core.impl.provider.entity.SourceProvider$SAXSourceReader
com.sun.jersey.core.impl.provider.entity.SourceProvider$DOMSourceReader
com.sun.jersey.core.impl.provider.entity.XMLRootElementProvider$General
com.sun.jersey.core.impl.provider.entity.XMLListElementProvider$General
com.sun.jersey.core.impl.provider.entity.XMLRootObjectProvider$General
com.sun.jersey.core.impl.provider.entity.EntityHolderReader
Exception in thread "main" com.sun.jersey.api.client.ClientHandlerException: A message body reader for Java class java.util.List, and Java type java.util.List<Account>, and MIME media type application/json was not found
at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:549)
at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:523)
at com.sample.Sample.getToRestPartner(Sample.java:59)
at com.sample.Sample.main(Sample.java:22)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Your help will be appreciated !!
Answer
Few things either need to be fixed or added (not sure in your case as some parts are missing)
Resource: Made my own to test, as yours was missing a few items
@Path("/")
public class AccountResource {
@GET
@Path("/account") // route to a specific method.re
@Produces(MediaType.APPLICATION_JSON)
public Response saveDataIntoHash() {
List<Account> accounts = new ArrayList<Account>();
accounts.add(new Account("Stack", "Savings"));
accounts.add(new Account("Overflow", "Checkings"));
GenericEntity generic = new GenericEntity<List<Account>>(accounts){};
return Response.status(201).entity(generic).build();
}
}
Assumed you have this dependency:
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-json</artifactId>
<version>${jersey-version}</version>
</dependency>
Test case: Notice the client configuration. This is needed.
public void testMyResource() {
ClientConfig config = new DefaultClientConfig();
config.getClasses().add(JacksonJaxbJsonProvider.class);
config.getFeatures().put(JSONConfiguration.FEATURE_POJO_MAPPING, Boolean.TRUE);
Client c = Client.create(config);
WebResource resource = c.resource(Main.BASE_URI);
ClientResponse response = resource.path("account")
.accept("application/json").get(ClientResponse.class);
List<Account> accounts
= response.getEntity(new GenericType<List<Account>>(){});
StringBuilder builder = new StringBuilder("=== Accounts ===\n");
for (Account account: accounts) {
builder.append("Name: ").append(account.getName()).append(", ")
.append("Type: ").append(account.getType()).append("\n");
}
builder.append("==================");
System.out.println(builder.toString());
}
Account (client) class is missing one annotation. It is required as you are using field annotations. Another option is to add a getter and setter for the id
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD) // <======= This Here
public class Account {
// added toString for testing
@Override
public String toString() {
return "Account{" + "name=" + name
+ ", type=" + type
+ ", id=" + id + '}';
}
}
Result from test:
=== Accounts ===
Name: Stack, Type: Savings
Name: Overflow, Type: Checkings
==================
Note: this test is based on the assumption that nothing is wrong on your server side.