I'm writing a REST web app (NetBeans 6.9, JAX-RS, TopLink Essentials) and trying to return JSON and HTTP status code. I have code ready and working that returns JSON when the HTTP GET method is called from the client. Essentially:
#Path("get/id")
#GET
#Produces("application/json")
public M_機械 getMachineToUpdate(#PathParam("id") String id) {
// some code to return JSON ...
return myJson;
}
But I also want to return an HTTP status code (500, 200, 204, etc.) along with the JSON data.
I tried to use HttpServletResponse:
response.sendError("error message", 500);
But this made the browser think it's a "real" 500 so the output web page was a regular HTTP 500 error page.
I want to return an HTTP status code so that my client-side JavaScript can handle some logic depending on it (to e.g. display the error code and message on an HTML page). Is this possible or should HTTP status codes not be used for such thing?
Here's an example:
#GET
#Path("retrieve/{uuid}")
public Response retrieveSomething(#PathParam("uuid") String uuid) {
if(uuid == null || uuid.trim().length() == 0) {
return Response.serverError().entity("UUID cannot be blank").build();
}
Entity entity = service.getById(uuid);
if(entity == null) {
return Response.status(Response.Status.NOT_FOUND).entity("Entity not found for UUID: " + uuid).build();
}
String json = //convert entity to json
return Response.ok(json, MediaType.APPLICATION_JSON).build();
}
Take a look at the Response class.
Note that you should always specify a content type, especially if you are passing multiple content types, but if every message will be represented as JSON, you can just annotate the method with #Produces("application/json")
There are several use cases for setting HTTP status codes in a REST web service, and at least one was not sufficiently documented in the existing answers (i.e. when you are using auto-magical JSON/XML serialization using JAXB, and you want to return an object to be serialized, but also a status code different than the default 200).
So let me try and enumerate the different use cases and the solutions for each one:
1. Error code (500, 404,...)
The most common use case when you want to return a status code different than 200 OK is when an error occurs.
For example:
an entity is requested but it doesn't exist (404)
the request is semantically incorrect (400)
the user is not authorized (401)
there is a problem with the database connection (500)
etc..
a) Throw an exception
In that case, I think that the cleanest way to handle the problem is to throw an exception. This exception will be handled by an ExceptionMapper, that will translate the exception into a response with the appropriate error code.
You can use the default ExceptionMapper that comes pre-configured with Jersey (and I guess it's the same with other implementations) and throw any of the existing sub-classes of javax.ws.rs.WebApplicationException. These are pre-defined exception types that are pre-mapped to different error codes, for example:
BadRequestException (400)
InternalServerErrorException (500)
NotFoundException (404)
Etc. You can find the list here: API
Alternatively, you can define your own custom exceptions and ExceptionMapper classes, and add these mappers to Jersey by the mean of the #Provider annotation (source of this example):
public class MyApplicationException extends Exception implements Serializable
{
private static final long serialVersionUID = 1L;
public MyApplicationException() {
super();
}
public MyApplicationException(String msg) {
super(msg);
}
public MyApplicationException(String msg, Exception e) {
super(msg, e);
}
}
Provider :
#Provider
public class MyApplicationExceptionHandler implements ExceptionMapper<MyApplicationException>
{
#Override
public Response toResponse(MyApplicationException exception)
{
return Response.status(Status.BAD_REQUEST).entity(exception.getMessage()).build();
}
}
Note: you can also write ExceptionMappers for existing exception types that you use.
b) Use the Response builder
Another way to set a status code is to use a Response builder to build a response with the intended code.
In that case, your method's return type must be javax.ws.rs.core.Response. This is described in various other responses such as hisdrewness' accepted answer and looks like this :
#GET
#Path("myresource({id}")
public Response retrieveSomething(#PathParam("id") String id) {
...
Entity entity = service.getById(uuid);
if(entity == null) {
return Response.status(Response.Status.NOT_FOUND).entity("Resource not found for ID: " + uuid).build();
}
...
}
2. Success, but not 200
Another case when you want to set the return status is when the operation was successful, but you want to return a success code different than 200, along with the content that you return in the body.
A frequent use case is when you create a new entity (POST request) and want to return info about this new entity or maybe the entity itself, together with a 201 Created status code.
One approach is to use the response object just like described above and set the body of the request yourself. However, by doing this you loose the ability to use the automatic serialization to XML or JSON provided by JAXB.
This is the original method returning an entity object that will be serialized to JSON by JAXB:
#Path("/")
#POST
#Consumes({ MediaType.APPLICATION_JSON })
#Produces({ MediaType.APPLICATION_JSON })
public User addUser(User user){
User newuser = ... do something like DB insert ...
return newuser;
}
This will return a JSON representation of the newly created user, but the return status will be 200, not 201.
Now the problem is if I want to use the Response builder to set the return code, I have to return a Response object in my method. How do I still return the User object to be serialized?
a) Set the code on the servlet response
One approach to solve this is to obtain a servlet request object and set the response code manually ourselves, like demonstrated in Garett Wilson's answer :
#Path("/")
#POST
#Consumes({ MediaType.APPLICATION_JSON })
#Produces({ MediaType.APPLICATION_JSON })
public User addUser(User user, #Context final HttpServletResponse response){
User newUser = ...
//set HTTP code to "201 Created"
response.setStatus(HttpServletResponse.SC_CREATED);
try {
response.flushBuffer();
}catch(Exception e){}
return newUser;
}
The method still returns an entity object and the status code will be 201.
Note that to make it work, I had to flush the response. This is an unpleasant resurgence of low-level Servlet API code in our nice JAX_RS resource, and much worse, it causes the headers to be unmodifiable after this because they were already sent on the wire.
b) Use the response object with the entity
The best solution, in that case, is to use the Response object and set the entity to be serialized on this response object. It would be nice to make the Response object generic to indicate the type of the payload entity in that case, but is not the currently the case.
#Path("/")
#POST
#Consumes({ MediaType.APPLICATION_JSON })
#Produces({ MediaType.APPLICATION_JSON })
public Response addUser(User user){
User newUser = ...
return Response.created(hateoas.buildLinkUri(newUser, "entity")).entity(restResponse).build();
}
In that case, we use the created method of the Response builder class in order to set the status code to 201. We pass the entity object (user) to the response via the entity() method.
The result is that the HTTP code is 401 as we wanted, and the body of the response is the exact same JSON as we had before when we just returned the User object. It also adds a location header.
The Response class has a number of builder method for different statuses (stati ?) such as :
Response.accepted()
Response.ok()
Response.noContent()
Response.notAcceptable()
NB: the hateoas object is a helper class that I developed to help generate resources URIs. You will need to come up with your own mechanism here ;)
That's about it.
I hope this lengthy response helps somebody :)
The answer by hisdrewness will work, but it modifies the whole approach to letting a provider such as Jackson+JAXB automatically convert your returned object to some output format such as JSON. Inspired by an Apache CXF post (which uses a CXF-specific class) I've found one way to set the response code that should work in any JAX-RS implementation: inject an HttpServletResponse context and manually set the response code. For example, here is how to set the response code to CREATED when appropriate.
#Path("/foos/{fooId}")
#PUT
#Consumes("application/json")
#Produces("application/json")
public Foo setFoo(#PathParam("fooID") final String fooID, final Foo foo, #Context final HttpServletResponse response)
{
//TODO store foo in persistent storage
if(itemDidNotExistBefore) //return 201 only if new object; TODO app-specific logic
{
response.setStatus(Response.Status.CREATED.getStatusCode());
}
return foo; //TODO get latest foo from storage if needed
}
Improvement: After finding another related answer, I learned that one can inject the HttpServletResponse as a member variable, even for singleton service class (at least in RESTEasy)!! This is a much better approach than polluting the API with implementation details. It would look like this:
#Context //injected response proxy supporting multiple threads
private HttpServletResponse response;
#Path("/foos/{fooId}")
#PUT
#Consumes("application/json")
#Produces("application/json")
public Foo setFoo(#PathParam("fooID") final String fooID, final Foo foo)
{
//TODO store foo in persistent storage
if(itemDidNotExistBefore) //return 201 only if new object; TODO app-specific logic
{
response.setStatus(Response.Status.CREATED.getStatusCode());
}
return foo; //TODO get latest foo from storage if needed
}
If you like to keep your resource layer clean of Response objects, then I recommend you use #NameBinding and binding to implementations of ContainerResponseFilter.
Here's the meat of the annotation:
package my.webservice.annotations.status;
import javax.ws.rs.NameBinding;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
#NameBinding
#Retention(RetentionPolicy.RUNTIME)
public #interface Status {
int CREATED = 201;
int value();
}
Here's the meat of the filter:
package my.webservice.interceptors.status;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ContainerResponseFilter;
import javax.ws.rs.ext.Provider;
import java.io.IOException;
#Provider
public class StatusFilter implements ContainerResponseFilter {
#Override
public void filter(ContainerRequestContext containerRequestContext, ContainerResponseContext containerResponseContext) throws IOException {
if (containerResponseContext.getStatus() == 200) {
for (Annotation annotation : containerResponseContext.getEntityAnnotations()) {
if(annotation instanceof Status){
containerResponseContext.setStatus(((Status) annotation).value());
break;
}
}
}
}
}
And then the implementation on your resource simply becomes:
package my.webservice.resources;
import my.webservice.annotations.status.StatusCreated;
import javax.ws.rs.*;
#Path("/my-resource-path")
public class MyResource{
#POST
#Status(Status.CREATED)
public boolean create(){
return true;
}
}
I found it very useful to build also a json message with repeated code, like this:
#POST
#Consumes("application/json")
#Produces("application/json")
public Response authUser(JsonObject authData) {
String email = authData.getString("email");
String password = authData.getString("password");
JSONObject json = new JSONObject();
if (email.equalsIgnoreCase(user.getEmail()) && password.equalsIgnoreCase(user.getPassword())) {
json.put("status", "success");
json.put("code", Response.Status.OK.getStatusCode());
json.put("message", "User " + authData.getString("email") + " authenticated.");
return Response.ok(json.toString()).build();
} else {
json.put("status", "error");
json.put("code", Response.Status.NOT_FOUND.getStatusCode());
json.put("message", "User " + authData.getString("email") + " not found.");
return Response.status(Response.Status.NOT_FOUND).entity(json.toString()).build();
}
}
In case you want to change the status code because of an exception, with JAX-RS 2.0 you can implement an ExceptionMapper like this. This handles this kind of exception for the whole app.
#Provider
public class UnauthorizedExceptionMapper implements ExceptionMapper<EJBAccessException> {
#Override
public Response toResponse(EJBAccessException exception) {
return Response.status(Response.Status.UNAUTHORIZED.getStatusCode()).build();
}
}
If your WS-RS needs raise an error why not just use the WebApplicationException?
#GET
#Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
#Path("{id}")
public MyEntity getFoo(#PathParam("id") long id, #QueryParam("lang")long idLanguage) {
if (idLanguage== 0){
// No URL parameter idLanguage was sent
ResponseBuilder builder = Response.status(Response.Status.BAD_REQUEST);
builder.entity("Missing idLanguage parameter on request");
Response response = builder.build();
throw new WebApplicationException(response);
}
... //other stuff to return my entity
return myEntity;
}
JAX-RS has support for standard/custom HTTP codes. See ResponseBuilder and ResponseStatus, for example:
http://jackson.codehaus.org/javadoc/jax-rs/1.0/javax/ws/rs/core/Response.ResponseBuilder.html#status%28javax.ws.rs.core.Response.Status%29
Keep in mind that JSON information is more about the data associated with the resource/application. The HTTP codes are more about the status of the CRUD operation being requested. (at least that is how it's supposed to be in REST-ful systems)
Please look at the example here, it best illustrates the problem and how it is solved in the latest (2.3.1) version of Jersey.
https://jersey.java.net/documentation/latest/representations.html#d0e3586
It basically involves defining a custom Exception and keeping the return type as the entity. When there is an error, the exception is thrown, otherwise, you return the POJO.
I'm not using JAX-RS, but I've got a similar scenario where I use:
response.setStatus(HttpStatus.INTERNAL_SERVER_ERROR.value());
Also, notice that by default Jersey will override the response body in case of an http code 400 or more.
In order to get your specified entity as the response body, try to add the following init-param to your Jersey in your web.xml configuration file :
<init-param>
<!-- used to overwrite default 4xx state pages -->
<param-name>jersey.config.server.response.setStatusOverSendError</param-name>
<param-value>true</param-value>
</init-param>
The following code worked for me. Injecting the messageContext via annotated setter and setting the status code in my "add" method.
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.Response;
import org.apache.cxf.jaxrs.ext.MessageContext;
public class FlightReservationService {
MessageContext messageContext;
private final Map<Long, FlightReservation> flightReservations = new HashMap<>();
#Context
public void setMessageContext(MessageContext messageContext) {
this.messageContext = messageContext;
}
#Override
public Collection<FlightReservation> list() {
return flightReservations.values();
}
#Path("/{id}")
#Produces("application/json")
#GET
public FlightReservation get(Long id) {
return flightReservations.get(id);
}
#Path("/")
#Consumes("application/json")
#Produces("application/json")
#POST
public void add(FlightReservation booking) {
messageContext.getHttpServletResponse().setStatus(Response.Status.CREATED.getStatusCode());
flightReservations.put(booking.getId(), booking);
}
#Path("/")
#Consumes("application/json")
#PUT
public void update(FlightReservation booking) {
flightReservations.remove(booking.getId());
flightReservations.put(booking.getId(), booking);
}
#Path("/{id}")
#DELETE
public void remove(Long id) {
flightReservations.remove(id);
}
}
Expanding on the answer of Nthalk with Microprofile OpenAPI you can align the return code with your documentation using #APIResponse annotation.
This allows tagging a JAX-RS method like
#GET
#APIResponse(responseCode = "204")
public Resource getResource(ResourceRequest request)
You can parse this standardized annotation with a ContainerResponseFilter
#Provider
public class StatusFilter implements ContainerResponseFilter {
#Override
public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext) {
if (responseContext.getStatus() == 200) {
for (final var annotation : responseContext.getEntityAnnotations()) {
if (annotation instanceof APIResponse response) {
final var rawCode = response.responseCode();
final var statusCode = Integer.parseInt(rawCode);
responseContext.setStatus(statusCode);
}
}
}
}
}
A caveat occurs when you put multiple annotations on your method like
#APIResponse(responseCode = "201", description = "first use case")
#APIResponse(responseCode = "204", description = "because you can")
public Resource getResource(ResourceRequest request)
I'm using jersey 2.0 with message body readers and writers. I had my method return type as a specific entity which was also used in the implementation of the message body writer and i was returning the same pojo, a SkuListDTO.
#GET
#Consumes({"application/xml", "application/json"})
#Produces({"application/xml", "application/json"})
#Path("/skuResync")
public SkuResultListDTO getSkuData()
....
return SkuResultListDTO;
all i changed was this, I left the writer implementation alone and it still worked.
public Response getSkuData()
...
return Response.status(Response.Status.FORBIDDEN).entity(dfCoreResultListDTO).build();
I have the following JSON that will be passed as part of a HTTP request, in the message body.
{
"names": [
{
"id":"<number>",
"name":"<string>",
"type":"<string>",
}
]
}
My current REST handler is below. I am able to get the Id and `Version that is passed in as path params, but I am not sure how to retrieve the contents on the message body?
#PUT
#Path("/Id/{Id}/version/{version}/addPerson")
public Response addPerson(#PathParam("Id") String Id,
#PathParam("version") String version) {
if (isNull(Id) || isEmpty(version)) {
return ResponseBuilder.badRequest().build();
}
//HOW TO RECIEVE MESSAGE BODY?
//carry out PUT request and return DTO: code not shown to keep example simple
if (dto.isSuccess()) {
return Response.ok().build();
} else {
return Response.serverError().build();
}
}
Note: I am using the JAX-RS framework.
You just need to map your name json to a POJO and add #Consumes annotation to your put method, here is an example:
#PUT
#Consumes("application/json")
#Path("/Id/{Id}/version/{version}/addPerson")
public Response addPerson(#PathParam("Id") String Id,
#PathParam("version") String version,
List<NamObj> names) {
I assume you are trying to retrieve a list of elements if is not the case just use you POJO as it in the param.
Depending on what json library are you using in your server you may need to add #xml annotation to your POJO so the parser could know how to map the request, this is how the mapping for the example json should look like:
#XmlRootElement
public class NameObj {
#XmlElement public int id;
#XmlElement public String name;
#XmlElement public String type;
}
Jersey doc: https://jersey.java.net/documentation/latest/user-guide.html#json
#cosumes reference: http://docs.oracle.com/javaee/6/tutorial/doc/gilik.html#gipyt
I wrote a jax-rs service using jersey, and the class is as follows,
I want to define the url for the following like this,
One to get the reports by passing parameters
http://localhost:8085/DiginReport/rs/Reports/getreport/{test1:value,test2:value}
One to start the Engine:
http://localhost:8085/DiginReport/rs/Reports/start
#Path("Reports")
public class ReportService {
#GET
#Path("/getreport}/{parameters}")
#Produces(MediaType.TEXT_PLAIN)
public Response getReport(#PathParam("reportName") String reportName,#PathParam("parameters") String parameters) throws KettleXMLException, KettleMissingPluginsException, JSONException, UnknownParamException {
JSONArray jsonarr;
return Response.status(200).entity("ok").build();
}
#GET
#Path("{start}")
#Produces(MediaType.TEXT_PLAIN)
public Response startEngine(#PathParam("start") String command) {
return Response.status(200).entity("ok").build();
}
}
When i type this in url , it says resource not avaliable,
http://localhost:8085/DiginReport/rs/Reports/start
Try the following code.
I would also consider the following things:
Pass Json data as application/json instead of string as path parameter (note that you need to escape.
Use another method than GET to start the engine (e.g. POST), since get should be only used to retrieve data.
Use resources within the URL instead of start or getreports.
#Path("Reports")
public class ReportService {
#GET
#Path("/getreport/{parameters}")
#Produces(MediaType.TEXT_PLAIN)
public Response getReport(#PathParam("parameters") String parameters) throws KettleXMLException, KettleMissingPluginsException, JSONException, UnknownParamException {
JSONArray jsonarr;
return Response.status(200).entity("ok").build();
}
#GET
#Path("/start")
#Produces(MediaType.TEXT_PLAIN)
public Response startEngine() {
return Response.status(200).entity("ok").build();
}
}
I'm using AndroidAnnotations to build a Rest for an Android Application.
On the Serverside im using PHP, which send a json looking like :
{"tag":"register","success":0,"error":2,"msg":"User already existed","body":[]}
I have two POJOS :
User.java:
public class User implements Serializable {
private String name;
private String email;
private String password;
//getter and setter Methods
}
Response.java:
public class RegistrationResponse implements Serializable {
private String tag;
private int success;
private int error;
private String msg;
private String body;
//getter and setter Methods
}
Rest Client:
#Rest(rootUrl = "http://my.domain.com", converters = {
MappingJacksonHttpMessageConverter.class,
StringHttpMessageConverter.class, GsonHttpMessageConverter.class }, interceptors = { MyInterceptor.class })
public interface RestClient extends RestClientErrorHandling {
#Post("/user/register/{name}/{email}/{pass}")
#Accept(MediaType.APPLICATION_JSON_VALUE)
Response sendUserRegistration(User user, String name, String email,
String pass);
RestTemplate getRestTemplate();
}
Activity.java:
//User and Response are POJOs
Response result = RestClient.sendUserRegistration(user,
user.getName(),user.getEmail(),user.getPassword());
But i got an Null Pointer Exception error on Activity.java. But if i change the return value of "sendUserRegistration" function to String all work. So my "Response" POJO seems not to be converted from AndroidAnnotations.
How can i convert the Rest Response to my "Response"-POJO using AndroidAnnotations?
You don't need to return the entire response object per rest call, just set the response to your custom object. Or you can also return a JsonObject also and use gson to convert it later on.
#Rest(rootUrl = "http://my.domain.com", converters = {
MappingJacksonHttpMessageConverter.class,
StringHttpMessageConverter.class, GsonHttpMessageConverter.class }, interceptors = { MyInterceptor.class })
public interface RestClient extends RestClientErrorHandling {
#Post("/user/register/{name}/{email}/{pass}")
#Accept(MediaType.APPLICATION_JSON_VALUE)
User sendUserRegistration(User user, String name, String email,
String pass);
RestTemplate getRestTemplate();
}
then just simply call
User newUser = RestClient.sendUserRegistration(user,
user.getName(),user.getEmail(),user.getPassword());
AA relies on Spring Android RestTemplate to make the rest call. And in order to build requests and handle responses this lib uses converters. And to know which converter the RestTemplate should use, it checks the content-type response header.
As MappingJacksonHttpMessageConverter and GsonHttpMessageConverter handles only http response with content-type=application/json and your result is converted to string, I'm pretty sure you forgot to set this header in your php server. So it send the default one (ie: text/plain) which is only handle by StringHttpMessageConverter.
Also, the body field is an object in your json example, but in your POJO you declared it as a String. So parsing will fail on this point.
I am writing a web service which should accept type Object[]. Its universal and needs to accept different number and types of parameters in different scenarios.
Request object looks like this:
#XmlRootElement
public class SimilarityRequest {
private Object[] params;
private String similarity;
public Object[] getParams() {
return params;
}
public void setParams(Object[] params) {
this.params = params;
}
public String getSimilarity() {
return similarity;
}
public void setSimilarity(String similarity) {
this.similarity = similarity;
}
}
This is WebService:
#SessionScoped
#Path("/similarity/")
#Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
#Consumes({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
#Stateful
#StatefulTimeout(600000) // 10 minutes
public class SimilarityResource {
#POST
#Path("/")
public List<SimilarityResult> universalSimilarity(JAXBElement<SimilarityRequest> sr) {
Object[] params = sr.getValue().getParams();
String similarity = sr.getValue().getSimilarity();
}
}
I dont know what json it accepts for params in this case? I tried "params":{5,10} and "params":{"0":5,"1":10} and also "params":[5,10]. Something throws 500 and something 400 (bad request). Any ideas?
I've successfully implemented the service using Jersey, the code is the same, I've just removed the JAXBElement wrapper and the #XmlRootElement annotation.
The WEB-INF.xml file must include the folder containing the SimilarityRequest class in the
com.sun.jersey.config.property.packages parameter section and the com.sun.jersey.api.json.POJOMappingFeature parameter must be true.
The service receives correctly the following json:
{ "similarity": "test", "params":[5,10] }
The object array contains two Integer values.