I'm using RESTful application in my java project. Normally in my unit test classes, I use methods like this:
public Employee getEmployeeByEmail(String email) {
ClientResponse clientResponse = webResource.path(beginPath + "getByEmail/" + email).get(
ClientResponse.class);
Employee employee = null;
if (200 == clientResponse.getStatus()) {
employee = clientResponse.getEntity(Employee.class);
}
return employee;
}
... but I have to use similar methods in almost 12 different classes. This is what I decided to do:
public class TestManager<T> {
private WebResource webResource;
private String beginPath;
private Class<T> clazz;
public TestManager(WebResource webResource, String beginPath, Class<T> clazz) {
this.webResource = webResource;
this.beginPath = beginPath;
this.clazz = clazz;
}
public boolean objectExists(String methodPath, String uniqueFieldName, String uniqueField) {
boolean check = false;
ClientResponse clientResponse = webResource.path(beginPath + methodPath + "/" + uniqueField).get(
ClientResponse.class);
JSONObject jsonObject = clientResponse.getEntity(JSONObject.class);
if (200 == clientResponse.getStatus() && !jsonObject.isNull(uniqueFieldName)) {
check = true;
}
return check;
}
public T getObjectById(String methodPath, long id) {
ClientResponse clientResponse = webResource.path(beginPath + methodPath + "/" + id).get(
ClientResponse.class);
T object = null;
if (200 == clientResponse.getStatus() && !clientResponse.getEntity(JSONObject.class).isNull("id")) {
object = clientResponse.getEntity(clazz);
}
return object;
}
}
The method objectExists() works fine, but getObjectById() method generate stack trace:
javax.ws.rs.WebApplicationException: javax.xml.bind.UnmarshalException: Error creating JSON-based XMLStreamReader - with linked exception:[javax.xml.stream.XMLStreamException: java.io.IOException: stream is closed]
It seems that I can't do this:
object = clientResponse.getEntity(clazz);
But I have no idea how to fix it. Sorry for my english :P
Edit:
Im using jersey
Edit2:
Solution:
The problem was I used getEntity() method twice ... If I use it only once ... it works ... damn it
It is a GET call. try calling it from a browser.
If that gives the same error, then there is nothing wrong with your client.
If you're having issues just with unit testing, then you might want to take a look at the Jersey Test Framework. Here's a link to the jersey docs on it, google can point you to further tutorials.
Related
it's my first API in Java, so please, keep that in mind ;) I've got Controller.class where I'm keeping all my methods right now ( I will clean it later ;) ). As far as GET methods work perfectly I've got problem with PUT method when I want to create new user - it doesn't work. Any help please ? And advices cause - as I said - I'm newbie when it comes to API ;)
So this is my controller.class :
#Path("/api")
public class Controller {
List<Post> mBartoszPosts;
List<Post> mFelipePosts;
List<Post> mShawnPosts;
List<Post> mDavidPosts;
List<Post> mGraziellaPosts;
List<Post> mAllPosts;
List<User> mUsers;
User bartosz;
User felipe;
User shawn;
User david;
User graziella;
#Path("/user/{id}")
#GET
#Produces("application/json")
public Response getUser(#PathParam("id")int id) {
setUpUsers();
System.out.println("Liczba osob : " + mUsers.size());
for(User user : mUsers) {
if(id == user.getId()) {
String result = user.toString();
return Response.status(200).entity(user).build();
}
}
return null;
}
#Path("/post/{post_id}")
#GET
#Produces("application/json")
public Response getPost(#PathParam("post_id")int post_id) {
setUpUsers();
System.out.println("Liczba osob : " + mUsers.size());
for(Post post : mAllPosts) {
if(post_id == post.getId()) {
String result = post.toString();
return Response.status(200).entity(post).build();
}
}
return null;
}
#Path("/posts")
#GET
#Produces("application/json")
public Response getPosts() {
setUpUsers();
String response = new Gson().toJson(mAllPosts );
return Response.status(200).entity(response).build();
}
#PUT
#Path("user/new/{id}/{post}")
#Consumes(MediaType.APPLICATION_XML)
#Produces(MediaType.APPLICATION_XML)
public Response updateEmployeeById(#PathParam("id") Integer id,#PathParam("post") String userPost)
{
List<Post>userPosts = new ArrayList();
Post post = new Post(99,userPost,"Bartosz");
userPosts.add(post);
User updatedEmployee = new User(id,"Bartek","Szlapa",userPosts);
if(updatedEmployee.getName() == null) {
return Response.status(400).entity("Please provide the employee name !!").build();
}
updatedEmployee.setId(id);
updatedEmployee.setName(updatedEmployee.getName());
System.out.println(updatedEmployee.getName());
return Response.ok().entity(updatedEmployee).build();
}
public int maxValue(int array[]){
int max = Arrays.stream(array).max().getAsInt();
return max;
}
}
As you see the last method is PUT and it doesn't work: Here is my test client :
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Client client = ClientBuilder.newClient( new ClientConfig().register( Controller.class ) );
WebTarget webTarget = client.target("http://localhost:8080/JerseyDemos/rest").path("api").path("user").path("new").path("77");
List<Post>userPosts = new ArrayList();
Post post = new Post(99,"Bartek Szlapa","Testing post ...");
userPosts.add(post);
User emp = new User(99,"Bartek","Szlapa",userPosts);
Invocation.Builder invocationBuilder = webTarget.request(MediaType.APPLICATION_XML);
Response response = invocationBuilder.put(Entity.entity(emp, MediaType.APPLICATION_XML));
User user = response.readEntity(User.class);
System.out.println(response.getStatus());
System.out.println(user);
}
}
And finally my error :
Exception in thread "main" org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: MessageBodyWriter not found for media type=application/xml, type=class entities.User, genericType=class entities.User.
at org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.aroundWriteTo(WriterInterceptorExecutor.java:248)
at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:163)
at org.glassfish.jersey.message.internal.MessageBodyFactory.writeTo(MessageBodyFactory.java:1135)
at org.glassfish.jersey.client.ClientRequest.doWriteEntity(ClientRequest.java:516)
at org.glassfish.jersey.client.ClientRequest.writeEntity(ClientRequest.java:498)
at org.glassfish.jersey.client.internal.HttpUrlConnector._apply(HttpUrlConnector.java:384)
at org.glassfish.jersey.client.internal.HttpUrlConnector.apply(HttpUrlConnector.java:282)
at org.glassfish.jersey.client.ClientRuntime.invoke(ClientRuntime.java:278)
at org.glassfish.jersey.client.JerseyInvocation.lambda$invoke$0(JerseyInvocation.java:753)
at org.glassfish.jersey.internal.Errors.process(Errors.java:316)
at org.glassfish.jersey.internal.Errors.process(Errors.java:298)
at org.glassfish.jersey.internal.Errors.process(Errors.java:229)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:414)
at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:752)
at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:445)
at org.glassfish.jersey.client.JerseyInvocation$Builder.put(JerseyInvocation.java:334)
at test.Test.main(Test.java:33)
Thanks in advance for help!
It seems 2 problems in your client code -
For removing this error, you should add jersey-media-jaxb JAR in your classpath. If you are using maven, add below dependency in your pom.xml -
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-jaxb</artifactId>
<version>${jersey.version}</version>
</dependency>
As per your PUT method API specification -
public Response updateEmployeeById(#PathParam("id") Integer id,#PathParam("post") String userPost) {
Your REST service needs only path parameter id and post. No other input is required. However, in your client code, you are sending User class object emp object while calling your API -
Response response = invocationBuilder.put(Entity.entity(emp, MediaType.APPLICATION_XML));
Since you are not receiving this emp object in your API, so this data will get lost. So, either you should update your API for accepting User class object in request or don't sent this object from your client code.
for a project I have to make a Java backend using RESTful services, restservices. When I add a certain resource to my project with a get method and a post method, the server gives a 500 error. When i remove the GET and POST methods, it works fine again. Can anyone explain why it won't work?
Resource file:
package nl.hu.v1ipass.testipass.webservices;
#Path("/aanmeldingen")
public class AanmeldingResource {
private JsonObjectBuilder aanmeldingToJson(Aanmelding aanmelding) {
JsonObjectBuilder job = Json.createObjectBuilder();
job.add("lidnummer", aanmelding.getEter().getLidNummer());
job.add("lidnaam", aanmelding.getEter().getName());
job.add("gerechtnaam", aanmelding.getGerecht().getName());
return job;
}
#GET
#RolesAllowed("admin")
#Produces("appplication/json")
public String getAanmeldingen(#FormParam("datum") String datum) {
AanmeldingService service = new AanmeldingService();
JsonArrayBuilder jab = Json.createArrayBuilder();
for (Aanmelding a : service.getAanmeldingDate(datum)){
jab.add(aanmeldingToJson(a));
}
JsonArray array = jab.build();
return array.toString();
}
#POST
#RolesAllowed({"user", "admin"})
public Response addAanmelding(#FormParam("datum") String datum, #FormParam("gerecht") int gerechtId, #FormParam("lidnummer") int lidnummer) throws SQLException {
AanmeldingService service = ServiceProvider.getAanmeldingService();
if(service.getAanmeldingDate(datum) == null) {
Aanmelding returnAanmelding = service.addAanmelding(lidnummer, gerechtId);
String a = aanmeldingToJson(returnAanmelding).build().toString();
return Response.ok(a).build();
} else {
return Response.status(Response.Status.FOUND).build();
}
}
}
UPDATE: with only the POST method, the server works fine. So what goes wrong in my GET method?
Try changing
#Produces("appplication/json")
to
#Produces("application/json")
notice the spelling mistake
I am working on a client server application. I was using Restlet 2.0.3. Due to a heavy load task my client was getting timed-out. I searched on the forum and found that switching over to Restlet 2.2 would help. So I did that. I upgraded my Restlet to 2.2.1. But now my code has stopped working at precisely this method.
public synchronized UUID generateUniqueSessionId(String userAtDomain)
{
UUID newSessionId = UUID.randomUUID();
SessionAttributes sessionAttributes = new SessionAttributes();
sessionAttributes.setAlive(true);
sessionAttributes.setFQUserName(userAtDomain);
loggedInUsers.put(newSessionId, sessionAttributes);
return newSessionId;
}
So I am returning the UUID at last.
This code is on the server and invoked during login. Following is the error that I am getting from the logs.
16 Mar 2015 11:23:18 WARN - Unable to find a converter for this object : f3d2edda-443c-454d-856a-fb4e7ed9c535
And this object referred in the log belongs to java.util.UUID
The code on the client side which invokes the server looks like this.
public UUID authenticateUser(String username, String passwd) {
try {
String url = RESTLetWebSvcsFactory.getFactoryInstance().getServer_URL() + "login/" + username + "/" + passwd;
Context context = new Context();
Client client = new Client(context, Protocol.HTTP);
ClientHelper helper = new ClientHelper(client);
helper.getHelpedParameters().set("socketConnectTimeoutMs", "60000");
ClientResource cr = new ClientResource(url);
LoginLogoutResource resource = cr.wrap(LoginLogoutResource.class);
return resource.loginUser();
} catch (ResourceException re) {
if (re.getStatus().isConnectorError()) {
try {
RESTLetWebSvcsFactory.enableFallBackServer();
String url = RESTLetWebSvcsFactory.getFactoryInstance().getServer_URL() + "login/" + username + "/" + passwd;
ClientResource cr = new ClientResource(url);
LoginLogoutResource resource = cr.wrap(LoginLogoutResource.class);
return resource.loginUser();
} catch (ResourceException re1) {
int statusCode = new RESTLetErrorHandler().handleServerError(re);
if (statusCode != -1) {
throw new UserCRUDException(statusCode);
}
}
} else {
throw new UserCRUDException(new RESTLetErrorHandler().handleServerError(re));
}
}
return null;
}
Note: USERCRUDException is my own exception and not one of JAVA
Please help me resolve this problem which probably prevents returning the UUID from the server and thus my application isn't moving ahead.
Thanks in advance
Restlet uses under the hood a generic bean conversion to convert bean to representation (and representation to bean). So your problem depends on the converter you use.
I made a test with the extension org.restlet.ext.jackson (that contains such bean converter) and with version 2.2.1 of Restlet. My test bean is described below:
public class TestBean {
private String name;
private String message;
private UUID uuid;
(...)
public UUID getUuid() {
return uuid;
}
public void setUuid(UUID uuid) {
this.uuid = uuid;
}
}
and the following test server resource:
public class MyServerResource extends ServerResource {
#Get
public TestBean ping() {
TestBean bean = new TestBean();
bean.setMessage("pong");
bean.setUuid(UUID.randomUUID());
return bean;
}
}
I received the following content for a GET method:
{
"name":"my name",
"message":"my message",
"uuid":"be9e5381-d5c9-4e45-b5c8-4af1f8bdca16"
}
Can you provide the converter you use? and the list of the Restlet dependencies you have in your application?
Hope it helps you,
Thierry
I have a POJO given below which I want to PUT to the server as JSON or XML.
This is what I have done
CLIENT:
ClientConfig config = new ClientConfig();
Client client = ClientBuilder.newClient(config);
WebTarget target = client.target(getBaseURI());
public void putFriend(String uri , Friend friend)
{
System.out.println(friend.toString());
target = target.path(some_path).path(uri);
ClientResponse response = target.request(MediaType.APPLICATION_JSON).put(Entity.entity(friend,MediaType.APPLICATION_JSON),ClientResponse.class);
}
Examples I found on web were using WebResource.
I don't know how to do using WebTarget. What I have done is taken from some example found on SO but Entity.entity() gives error undefined method entity(friend, String).
POJO
#XmlRootElement
public class Friend{
private String friendURI;
private String event;
private String uri;
String getUri() {
return uri;
}
void setUri(String uri) {
this.uri = uri;
}
String getFriendURI() {
return friendURI;
}
void setFriendURI(String friendURI) {
this.friendURI = friendURI;
}
String getEvent() {
return event;
}
void setEvent(String event) {
this.event = event;
}
public String toString() {
return "Friend [friendURI=" + friendURI + ", uri=" + uri + ", event=" + event
+ "]";
}
Please guide how to do this.
Thanks
There are two different Jersey major versions, 1.x and 2.x, You seems to be trying to use a combination of both, which won't work. The 2.x versions don't have some classes as in 1.x and vice versa.
If you want to use Jersey 2.x, then you should be using Response, rather than ClientResponse
Response response = target.request().put(Entity.json(friend));
// .json == automatic 'application/json'
See Working with the Client API for 2.x
Also as mentioned in your previous post, the getters and setters should be public for the Friend class
Also see the WebTarget API
Basic breakdown.
Calling request() on WebTarget returns an Invocation.Buidler
Invocation.Builder builder = target.request();
Once we call put, we get back a Response
Response response = builder.put(Entity.json(friend));
To extract a known type from the response, we could use readEntity(Class type)
String responseString = response.readEntity(String.class);
response.close();
In my Jersey Rest Service i tried to create an entity tag with:
String content = 12sdfs-345dsdfsdf-231yscysd;
String createdContent = create(content);
return Response.created(createdUri).entity(createdContent).build();
like its written in the jersey documentation. But createdContent is null. Whats wrong?
The full code is:
#POST
#Consumes("application/x-www-form-urlencoded")
public Response postObject(#FormParam("number") int number) {
ObjectDTO c = new ObjectDTO();;
c.setNumber(number);
String generatedId = generateID();
c.setId(generatedId);
c.setOwner(sec.getUserPrincipal().getName());
return postAndGetResponse(c);
}
private Response postAndGetResponse(ObjectDTO object) {
Response res;
System.out.println(object);
if(ObjectDAO.instance.getObjectDao().containsKey(object.getId())) {
res = Response.serverError().status(409).build();
} else {
System.out.println(object);
System.out.println(object.getId());
String createdContent = create(object.getId());
System.out.println(createdContent);
res = Response.created(uriInfo.getAbsolutePath()).entity(createdContent).build();
ObjectDAO.instance.getObjectDao().put(object.getId(), object);
}
return res;
}
edit:
http://jersey.java.net/nonav/documentation/latest/jax-rs.html#d4e188
chapter 2.5
To create an entity tag simply call new EntityTag(string). But what are you trying to achieve in the code above? The entity tag should be attached to the header, not to the body.