We have built an API in which in our model We have a field
#Min(1) #Max(16)
private Long demoField;
When we provide 17 to demoField
it will throw us an error on the client-side
"must be less than or equal to 16"
But when we see the violation message it includes the field name and the message looks like
"demoField: must be less than or equal to 16"
So the question of why we are not getting field name in the client-side error message.
Am I missing something?
API built on spring boot
It's not passed by default. You could implement your own error handler to customize the message passed back, by using #ControllerAdvice for example.
One way is to just specify the message:
#Min(value = 5, message="Age must be at least 5")
In which case in the #ControllerAdvice, you would just need to read getDefaultMessage()
If you don't want to manually add default messages, the approach would be to implement something along the lines of (with appropriate null checks etc):
package com.example.demo;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.BindException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
#ControllerAdvice
public class GlobalExceptionHandler extends ResponseEntityExceptionHandler {
#Override
protected ResponseEntity<Object> handleBindException(
BindException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
return new ResponseEntity<>(
ex.getFieldError().getField() + ": " + ex.getFieldError().getDefaultMessage(),
headers,
status);
}
}
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 a REST callback service that must consume XML in the following format:
<SearchRequest>
<SearchCriteria>
<Param1></Param2>
<Param2></Param2>
</SearchCriteria>
</SearchRequest>
The actual XML has about 32 parameters within "Criteria", but this gives the basic idea.
I created a SearchRequest class that has the attribute, searchCriteria, and a SearchCriteria class that has param1 and param2.
My REST controller class looks something like this:
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
#RestController
#RequestMapping("/acme/request/search")
public class AcmeCallbackController {
#RequestMapping(method = RequestMethod.POST, consumes = "application/xml")
public ResponseEntity<String> postAcmeSearch(#RequestBody SearchRequest body) {
StringBuffer resultBuffer = new StringBuffer(2048);
// implementation code here, 'body' now expected to be a SearchRequest object contructed from request body XML
return new ResponseEntity<String>(resultBuffer.toString(), HttpStatus.OK);
}
When I test the above service I receive the following error response:
`{ "timestamp": 1514390248822,
"status": 400,
"error": "Bad Request",
"exception": org.springframework.http.converter.HttpMessageNotReadableException",
"message": "JSON parse error: Can not construct instance of SearchRequest: no suitable constructor found, can not deserialize from Object value (missing default constructor or creator, or perhaps need to add/enable type information?); nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of SearchRequest: no suitable constructor found, can not deserialize from Object value (missing default constructor or creator, or perhaps need to add/enable type information?)\n at [Source: java.io.PushbackInputStream#26bd9717; line: 2, column: 3]",
"path": "/acme/request/search" }`
Does anyone know the suitable constructor and / or annotations to apply to SearchRequest, so that the xml request is correctly deserialized? I have #JsonProperty("{Attribute}") on all the getters and setters, where {Attribute} is the name of the attribute with an initial cap to match the XML element name, and a constructor that has an argument for each attribute value.
TIA,
Ed
I figured it out. I had to add annotations to the constructor arguments, e.g.
public SearchRequest(#JsonProperty("Param1") String param1,
#JsonProperty("Param2") String param2) {
this.param1 = param1;
this.param2 = param2;
}
It worked fine after that.
I have the following GET REST method:
import java.time.OffsetDateTime;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.HeaderParam;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.Response;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiResponse;
import io.swagger.annotations.ApiResponses;
import com.product.rest.api.TransactionsApi;
import com.product.rest.model.Transaction;
#Path("/transactions")
#Api(description = "the transactions API")
#Consumes({ "application/json" })
#Produces({ "application/json" })
public class TransactionsApiImpl extends TransactionsApi {
#GET
#Consumes({ "application/json" })
#Produces({ "application/json" })
#ApiOperation(value = "", notes = "Get all transactions", response = Transaction.class, responseContainer = "List", tags = {})
#ApiResponses(
value = { #ApiResponse(code = 200, message = "OK", response = Transaction.class, responseContainer = "List"),
#ApiResponse(code = 400, message = "Bad Request", response = Transaction.class, responseContainer = "List"),
#ApiResponse(code = 404, message = "Not Found", response = Transaction.class, responseContainer = "List"),
#ApiResponse(code = 500, message = "Internal Server Error", response = Transaction.class, responseContainer = "List") })
#Override
public Response transactionsGet(
#HeaderParam("tok") String tok,
#QueryParam("param1") Integer param1,
#QueryParam("param2") String param2,
#QueryParam("param3") OffsetDateTime param3,
#QueryParam("param4") OffsetDateTime param4,
#QueryParam("param5") Integer param5,
#QueryParam("param6") Integer param6,
#QueryParam("param7") String param7) {
return Response.ok().entity("Success!").build();
}
The TransactionsApi is a generated implementation using Swagger Codegen, as is the Transaction model class. I have several other functions in this class, but whenever I leave the GET /transactions function uncommented, I receive the following error:
WARN [Thread-1] (ContextHandler.java:2175) - unavailable
org.glassfish.jersey.server.model.ModelValidationException: Validation of the application resource model has failed during application initialization.
[[FATAL] No injection source found for a parameter of type public javax.ws.rs.core.Response
com.product.rest.impl.v1.TransactionsApiImpl.transactionsGet(java.lang.String,java.lang.Integer,java.lang.String,java.time.OffsetDateTime,java.time.OffsetDateTime,java.lang.Integer,java.lang.Integer,java.lang.String) at index 3.; source='ResourceMethod{httpMethod=GET, consumedTypes=[application/json], producedTypes=[application/json], suspended=false, suspendTimeout=0, suspendTimeoutUnit=MILLISECONDS, invocable=Invocable{handler=ClassBasedMethodHandler{handlerClass=class com.product.rest.impl.v1.TransactionsApiImpl, handlerConstructors=[org.glassfish.jersey.server.model.HandlerConstructor#7df78e88]}, definitionMethod=public javax.ws.rs.core.Response
All other similar questions I have found had to do with MultiPart Data and file uploading, whereas I am making a simple GET request. Other functions that also use the javax.ws.rs.code.Response class do not have this issue and the server starts normally.
I have noticed that the problem happens whenever the OffsetDateTime class is in the parameters (i.e. param3 and param4), but I have been unable to find out why. Moreover, OffsetDateTime was chosen by Swagger Codegen and I am reluctant to change it seeing how I will have to change every derived file afterwards whenever I regenerate my sources.
Has anyone had this issue before with REST services and OffsetDateTime?
All other similar questions I have found had to do with MultiPart Data and file uploading
It's related. The error is a general error you get when Jersey can't validate the resource model. Part of the resource model is the method parameters. Jersey has a system for knowing which parameters it will be able to process and which ones it won't. In your case, it doesn't know how to process the OffsetDateTime.
There are a set of rules that you need to follow in order to able to use non basic types as #QueryParams (and all other #XxxParams such as #PathParam and #FormParam, etc.):
Be a primitive type
Have a constructor that accepts a single String argument
Have a static method named valueOf or fromString that accepts a single String argument (see, for example, Integer.valueOf(String))
Have a registered implementation of ParamConverterProvider JAX-RS extension SPI that returns a ParamConverter instance capable of a "from string" conversion for the type.
Be List<T>, Set<T> or SortedSet<T>, where T satisfies 2, 3 or 4 above. The resulting collection is read-only.
So in this case of OffsetDateTime, going down the list; it's not a primitive; it doesn't have a String constructor; it doesn't have a static valueOf or fromString
So basically, the only option left is to implement a ParamConverter/ParamConverterProvider for it. The basic set up looks like
#Provider
public class OffsetDateTimeProvider implements ParamConverterProvider {
#Override
public <T> ParamConverter<T> getConverter(Class<T> clazz, Type type, Annotation[] annotations) {
if (clazz.getName().equals(OffsetDateTime.class.getName())) {
return new ParamConverter<T>() {
#SuppressWarnings("unchecked")
#Override
public T fromString(String value) {
OffsetDateTime time = ...
return (T) time;
}
#Override
public String toString(T time) {
return ...;
}
};
}
return null;
}
}
Jersey will pass you the String value of the query parameter, and it's your job to to create it and return it.
Then just register the OffsetDateTimeProvider with the application. If you're using package scanning, it should be picked up and registered automatically from the #Provider annotation.
I don't use Swagger, so I don't know if they already provide something like this already implemented, but it seems odd that they would generate this for you, and not have a way to make it work. I know Jersey 3 will have Java 8 support out the box, but who know when the heck that's gonna be released.
I have a simple RESTful web service that print "Hello World !"
I'm using NetBeans and the code looks like:
package resource;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.UriInfo;
import javax.ws.rs.Consumes;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.GET;
import javax.ws.rs.Produces;
#Path("simple")
public class SimpleResource {
#Context
private UriInfo context;
/** Creates a new instance of SimpleResource */
public SimpleResource() {
}
#GET
#Produces("application/xml")
public String getXml() {
//TODO return proper representation object
return "<greeting>Hello World !</greeting>";
}
#PUT
#Consumes("application/xml")
public void putXml(String content) {
}
}
I call this web service from this URL : http://localhost:8080/WebService/resources/simple.
Now, I want to send a parameter to this web service, then print this parameter after the "Hello world" message.
How can we do that?
Thanks!
The two main ways of handling a parameter in REST are via parsing the path and via extracting the query part.
Path parameters
These handle this case — /foo/{fooID} — where {fooID} is a template that will be replaced by the parameter you want:
#GET
#Produces("text/plain")
#Path("/foo/{fooID}")
public String getFoo(#PathParam("fooID") String id) {
// ...
}
These are great for the case where you can consider the parameter to be describing a resource.
Query parameters
These handle this case — /?foo=ID — just like you'd get from doing traditional form processing:
#GET
#Produces("text/plain")
#Path("/")
public String getFoo(#QueryParam("foo") String id) {
// ...
}
These are great for the case where you consider the parameter to be describing an adjunct to the resource, and not the resource itself. The #FormParam annotation is extremely similar, except it is for handling a POSTed form instead of GET-style parameters
Other types of parameters
There are other types of parameter handling supported by the JAX-RS spec (matrix parameters, header parameters, cookie parameters) which all work in about the same way to the programmer, but are rarer or more specialized in use. A reasonable place to start exploring the details is the JAX-RS javadoc itself, as that has useful links.
The sample code for a web service which accepts parameters in URl will look like this:
#GET
#Path("/search")
public String getUserDetailsFromAddress(
#QueryParam("name") String name) {
return "Hello"+name;
}
and the URL will be like this:
http://localhost:8080/searchapp/mysearch/search?name=Tom
Try adding a Path annotation like this:
#javax.ws.rs.Path(“/bookstore/books/{bookId}”)