CXF, out interceptor, alter response SOAP body - java

Using CXF interceptor, I want to alter the response body which is being sent to the client as response. (I want to add some more nodes)
My interceptor is configured as an outgoing interceptor, is being invoked but the body is empty.
public class AlterOutBodyInterceptor extends AbstractSoapInterceptor {
private SAAJOutInterceptor saajOut = new SAAJOutInterceptor();
public AlterOutBodyInterceptor() {
super(Phase.PRE_MARSHAL);
getBefore().add(SAAJOutInterceptor.class.getName());
}
public void handleMessage(SoapMessage message) throws Fault {
SOAPMessage doc = message.getContent(SOAPMessage.class);
if (doc == null) {
saajOut.handleMessage(message);
doc = message.getContent(SOAPMessage.class);
// it is executed
}
try {
SOAPBody body = doc.getSOAPBody();
// here, body doesn't contain anything that the client gets
} catch (SOAPException e) {
e.printStackTrace();
}
}
}
I am doing trial-error with getBefore - getAfter and Phases, but without luck. Thanks in advance!

The solution is as here:
(we checked cxf sources because it contains a lot of interceptors, we got the ideas from there)
public class Interceptor extends AbstractPhaseInterceptor<Message> {
private ObjectFactory objectFactory = new ObjectFactory();
public Interceptor() {
super(Phase.PRE_LOGICAL);
addBefore(HolderOutInterceptor.class.getName());
}
#Override
public void handleMessage(Message message) {
MessageContentsList outObjects = MessageContentsList.getContentsList(message);
Assert.isTrue(outObjects.size() == 1);
Object outObject = outObjects.get(0);
// object is our soap response
}
}

Related

How to use Holder<Payload> holder in SOAP web client

I am trying to figure out how to use a webservice which was generated from a wsdl file. In this project I am going send request by using the generated webservice client. The interface is shown below:
public interface IConnectService {
public void processMessage(
#WebParam(name = "payload", mode =
WebParam.Mode.INOUT)
Holder<Payload> payload);
}
The client is like this:
public class ConnectService
extends Service
{
private final static URL CONNECTSERVICE_WSDL_LOCATION;
private final static WebServiceException CONNECTSERVICE_EXCEPTION;
private final static QName CONNECTSERVICE_QNAME = new
QName("http://xxxxxx-asi.com/services", "ConnectService");
static {
URL url = null;
WebServiceException e = null;
try {
url = new URL("http://localhost/wsdl/xxxxx");
} catch (MalformedURLException ex) {
e = new WebServiceException(ex);
}
CONNECTSERVICE_WSDL_LOCATION = url;
CONNECTSERVICE_EXCEPTION = e;
}
public ConnectService() {
super(__getWsdlLocation(), CONNECTSERVICE_QNAME);
}
public ConnectService(WebServiceFeature... features) {
super(__getWsdlLocation(), CONNECTSERVICE_QNAME, features);
}
public ConnectService(URL wsdlLocation) {
super(wsdlLocation, CONNECTSERVICE_QNAME);
}
public ConnectService(URL wsdlLocation, WebServiceFeature...
features) {
super(wsdlLocation, CONNECTSERVICE_QNAME, features);
}
public ConnectService(URL wsdlLocation, QName serviceName) {
super(wsdlLocation, serviceName);
}
public ConnectService(URL wsdlLocation, QName serviceName,
WebServiceFeature... features) {
super(wsdlLocation, serviceName, features);
}
#WebEndpoint(name = "BasicHttpBinding_IConnectService")
public IConnectService getBasicHttpBindingIConnectService() {
return super.getPort(new QName("http://xxxxxxx-
asi.com/services", "BasicHttpBinding_IConnectService"),
IConnectService.class);
}
#WebEndpoint(name = "BasicHttpBinding_IConnectService")
public IConnectService
getBasicHttpBindingIConnectService(WebServiceFeature... features) {
return super.getPort(new QName("http://xxxxxx-asi.com/services",
"BasicHttpBinding_IConnectService"), IConnectService.class,
features);
}
private static URL __getWsdlLocation() {
if (CONNECTSERVICE_EXCEPTION!= null) {
throw CONNECTSERVICE_EXCEPTION;
}
return CONNECTSERVICE_WSDL_LOCATION;
}
}
The soap request message structure is going to be like in the picture: enter image description here
So my question is how can I use the client to make call which includes my soapmessage using the interface method? To my understand, the Holder object can only take Payload object, which is an childelement of ProcessMessege (as shown in the structure), and ProcessMessage is a childelement of SOAP body. I need to put the security credentials in the SOAP header and I already did that. So right now if I use the webservice method, I only can pass the payload object, but the web server will not accept the request because no credentials inside of the payload part. Anybody can help out for this problem? I really appreciate your help!
I solved this problem by using soapmessage handler and handler resolver. The handler can insert the credentials in the soap header and modifier the soap body to satisfy all my requirements for the soap message.

Modifying request body in Zuul pre filter not working

In my app I am using netflix zuul to route a request from a microservice (gateway) to another. The requests are being routed fine but I also want to introduce some parameters in the request body before it is routed to the appropriate microservice. For this I am using Zuul pre filter like this.
public class SimpleFilter extends ZuulFilter {
private static Logger log = LoggerFactory.getLogger(SimpleFilter.class);
#Override
public String filterType() {
return "pre";
}
#Override
public int filterOrder() {
return 1;
}
#Override
public boolean shouldFilter() {
return true;
}
#Override
public Object run() {
try {
RequestContext context = RequestContext.getCurrentContext();
InputStream in = (InputStream) context.get("requestEntity");
if (in == null) {
in = context.getRequest().getInputStream();
}
String body = StreamUtils.copyToString(in, Charset.forName("UTF-8"));
// body = "request body modified via set('requestEntity'): "+ body;
body = body.toUpperCase();
context.set("requestEntity", new ByteArrayInputStream(body.getBytes("UTF-8")));
} catch (IOException e) {
log.error(e.getMessage(), e);
}
return null;
}
}
For now I am just trying to change the body to upper case but the microservice to which this request is routed doesn't receive the modified body (upper case). Instead it receives the original one. Am I doing something wrong. Any help would be appreciated. Thanks !!
Was able to do the following - transform a GET request to a POST request, and add body content to the (proxied) POST request.
public Object run() throws ZuulException {
RequestContext context = RequestContext.getCurrentContext();
context.addZuulRequestHeader("Content-Type", "application/x-www-form-urlencoded");
String body = String.format("a=%s&b=%s", a, b);
final byte[] bytes = body.getBytes(StandardCharsets.UTF_8);
context.setRequest(new HttpServletRequestWrapper(context.getRequest()) {
#Override
public ServletInputStream getInputStream() {
return new ServletInputStreamWrapper(bytes);
}
#Override
public int getContentLength() {
return bytes.length;
}
#Override
public long getContentLengthLong() {
return bytes.length;
}
#Override
public String getMethod() {
return "POST";
}
});
return null;
}
try this one It's may be work in your case .
requestContext.getCurrentContext().put("requestEntity", new ByteArrayInputStream(body.getBytes("UTF-8")));
Turned out this method cannot change the request body within the requestContext. Truly in the requestContext, a new field "requestEntity" is added, however, the request body from context.getRequest().getInputStream() remains the same after this operation.
You can modify the request body, see this answer for an example. You just need to wrap the new request data and make sure you correctly report it's new content length.

How to capture exceptions on a REST client?

i have implemented rest webservices using Jersey, and whenever some exception occur on the server side, the client gets a generic HTTP 500 Internal Server Error, with no more info of the real exception. I found that people usually catch any exception on the server side, then throws a WebApplicationException, but even this way the client keeps getting the generic HTTP 500 Internal Server Error.
This is my webservice:
#PUT
#Produces(MediaType.APPLICATION_XML)
#Consumes(MediaType.APPLICATION_XML)
#Path("/transmitir")
public WrapperTransmissaoRetorno receber(WrapperTransmissao wrapperRecepcao) {
WrapperTransmissaoRetorno retorno = new WrapperTransmissaoRetorno();
retorno.setCodigoMaster(new Random().nextInt());
retorno.setDataRetorno(new Date());
if(true){
throw new WebApplicationException("Este pau eh bem graudo");
}
return retorno;
}
This is the code that calls the client:
try {
WsTransmissaoCliente client = new WsTransmissaoCliente();
WrapperTransmissao wrapperRecepcao = new WrapperTransmissao();
Transferencia transferencia = new Transferencia();
transferencia.setCodigoTabela(23);
transferencia.setCodigoTransferencia(56);
transferencia.setDataRetorno(new Date());
transferencia.setDataTransmissao(new Date(System.currentTimeMillis()+3000000));
transferencia.setNomeTabela("CUPOM");
transferencia.setTipoOperacao(TipoOperacao.UPDATE);
wrapperRecepcao.setTransferencia(transferencia);
Jumento jumento = new Jumento();
jumento.setIdade(24);
jumento.setNome("José");
wrapperRecepcao.setObjeto(jumento);
// Cabrito cabrito = new Cabrito();
// cabrito.setAltura(56);
// cabrito.setPeso(120.0);
// wrapperRecepcao.setObjeto(cabrito);
WrapperTransmissaoRetorno retorno = client.transmitir(wrapperRecepcao);
System.out.println("Retorno do WS: "+retorno);
} catch (Exception e) {
WebApplicationException exx = (WebApplicationException) e;
exx.printStackTrace();
}
How to avoid this and get the real exception? Or at least the message?
UPDATE
Here is the object i am sending as a response:
package br.atualy.integracaocheckout.wrappers;
import java.util.Date;
import javax.xml.bind.annotation.XmlRootElement;
#XmlRootElement
public class WrapperTransmissaoRetorno {
private Date dataRetorno;
private Integer codigoMaster;
public Date getDataRetorno() {
return dataRetorno;
}
public void setDataRetorno(Date dataRetorno) {
this.dataRetorno = dataRetorno;
}
public Integer getCodigoMaster() {
return codigoMaster;
}
public void setCodigoMaster(Integer codigoMaster) {
this.codigoMaster = codigoMaster;
}
#Override
public String toString() {
return "WrapperRecepcaoRetorno{" + "dataRetorno=" + dataRetorno + ", codigoMaster=" + codigoMaster + '}';
}
}
UPDATE 2
And here is the client:
import br.atualy.integracaocheckout.wrappers.WrapperTransmissao;
import br.atualy.integracaocheckout.wrappers.WrapperTransmissaoRetorno;
import javax.ws.rs.ClientErrorException;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.WebTarget;
public class WsTransmissaoCliente {
private final WebTarget webTarget;
private final Client client;
private static final String BASE_URI = "http://localhost:8080/IntegracaoCheckout/webresources";
public WsTransmissaoCliente() {
client = javax.ws.rs.client.ClientBuilder.newClient();
webTarget = client.target(BASE_URI).path("transmissao");
}
// public String receber() throws ClientErrorException {
// WebTarget resource = webTarget;
// resource = resource.path("receber");
// return resource.request(javax.ws.rs.core.MediaType.APPLICATION_XML).get(String.class);
// }
public WrapperTransmissaoRetorno transmitir(WrapperTransmissao requestEntity) throws ClientErrorException {
return webTarget.path("transmitir")
.request(javax.ws.rs.core.MediaType.APPLICATION_XML)
.put(javax.ws.rs.client.Entity.entity(requestEntity, javax.ws.rs.core.MediaType.APPLICATION_XML), WrapperTransmissaoRetorno.class);
}
public void close() {
client.close();
}
}
If using jawax.ws.rs.core.Response object.
SERVER :: In case of exception/failure set it as :
// do stuff
// here e.getMessage() can be custom failure message too
response = Response.serverError().entity(e.getMessage()).build();
// return response object
return response;
CLIENT :: On the client side check following :
if(response != null && reponse.getStatus() == Response.Status.INTERNAL_SERVER_ERROR.getStatusCode()) {
String serverErrorMsg = response.readEntity(String.class);
throw new Exception(serverErrorMsg);
}
Generally it's better to declare your method as returning a Response object instead of a user-defined type, and set the data as the entity. Then if you want to indicate that an exception has happened, you can just pass that exception as the entity of the Response you are returning.
e.g.
#GET
#Path("/foo")
public Response getFoo() {
try {
// do stuff
return Response.ok(someData).build();
} catch (Exception e) {
return Response.serverError().entity(e).build();
}
}
You'll notice that this way you don't ever end up actually throwing an exception out of your method, but rather return an explicit 500 response with an exception as the entity. This way you can still throw exceptions out of your code, but they'll be handled nicely.
EDIT
I'm not sure what your client wrapper code is doing, but you can pass the expected response data type into your call with the normal REST client:
Client client = ClientBuilder.newClient();
WebTarget target = client.target("http://foo.com/foo");
String response = target.request().get(String.class);
or you can also pull it out of the Response using the readEntity() method:
Client client = ClientBuilder.newClient();
WebTarget target = client.target("http://foo.com/foo");
Response response = target.request().get();
String entity = response.readEntity(String.class);
It sounds like what you need to do is check the return code, and then parse the entity as a either a WrapperTransmissaoRetorno or a WebApplicationException depending on what code was returned:
Response response = client.transmitir(wrapperRecepcao);
if (response.getStatus() == Response.Status.OK.getStatusCode()) { // 200
WrapperTransmissaoRetorno retorno = response.readEntity(WrapperTransmissaoRetorno.class);
// do stuff
} else if (response.getStatus() == Response.Status.INTERNAL_SERVER_ERROR.getStatusCode()) { // 500
WebApplicationException e = response.readEntity(WebApplicationException.class);
// do stuff
} // etc for other response codes
Use response object in webapplication excemption. It should work.
From java docs:
WebApplicationException(String message)
Construct a new instance with a blank message and default HTTP status code of 500.
Its a blank message. I haven't tried it myself. I guess this is the problem.
https://jersey.java.net/apidocs/2.6/jersey/javax/ws/rs/WebApplicationException.html
Even after all the suggestions i could not manage to throw the exception to the client.
So what i did was to put a String property inside my returning class, so when an exception occurs on the server side, this String will contain the exception message and i can get it on the client.

Handling custom error response in JAX-RS 2.0 client library

I am starting to use the new client API library in JAX-RS and really loving it so far. I have found one thing I cannot figure out however. The API I am using has a custom error message format that looks like this for example:
{
"code": 400,
"message": "This is a message which describes why there was a code 400."
}
It returns 400 as the status code but also includes a descriptive error message to tell you what you did wrong.
However the JAX-RS 2.0 client is re-mapping the 400 status into something generic and I lose the good error message. It correctly maps it to a BadRequestException, but with a generic "HTTP 400 Bad Request" message.
javax.ws.rs.BadRequestException: HTTP 400 Bad Request
at org.glassfish.jersey.client.JerseyInvocation.convertToException(JerseyInvocation.java:908)
at org.glassfish.jersey.client.JerseyInvocation.translate(JerseyInvocation.java:770)
at org.glassfish.jersey.client.JerseyInvocation.access$500(JerseyInvocation.java:90)
at org.glassfish.jersey.client.JerseyInvocation$2.call(JerseyInvocation.java:671)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:424)
at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:667)
at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:396)
at org.glassfish.jersey.client.JerseyInvocation$Builder.get(JerseyInvocation.java:296)
Is there some sort of interceptor or custom error handler that can be injected so that I get access to the real error message. I've been looking through documentation but can't see any way of doing it.
I am using Jersey right now, but I tried this using CXF and got the same result. Here is what the code looks like.
Client client = ClientBuilder.newClient().register(JacksonFeature.class).register(GzipInterceptor.class);
WebTarget target = client.target("https://somesite.com").path("/api/test");
Invocation.Builder builder = target.request()
.header("some_header", value)
.accept(MediaType.APPLICATION_JSON_TYPE)
.acceptEncoding("gzip");
MyEntity entity = builder.get(MyEntity.class);
UPDATE:
I implemented the solution listed in the comment below. It is slightly different since the classes have changed a bit in the JAX-RS 2.0 client API. I still think it is wrong that the default behavior is to give a generic error message and discard the real one. I understand why it wouldn't parse my error object, but the un-parsed version should have been returned. I end up having the replicate exception mapping that the library already does.
Thanks for the help.
Here is my filter class:
#Provider
public class ErrorResponseFilter implements ClientResponseFilter {
private static ObjectMapper _MAPPER = new ObjectMapper();
#Override
public void filter(ClientRequestContext requestContext, ClientResponseContext responseContext) throws IOException {
// for non-200 response, deal with the custom error messages
if (responseContext.getStatus() != Response.Status.OK.getStatusCode()) {
if (responseContext.hasEntity()) {
// get the "real" error message
ErrorResponse error = _MAPPER.readValue(responseContext.getEntityStream(), ErrorResponse.class);
String message = error.getMessage();
Response.Status status = Response.Status.fromStatusCode(responseContext.getStatus());
WebApplicationException webAppException;
switch (status) {
case BAD_REQUEST:
webAppException = new BadRequestException(message);
break;
case UNAUTHORIZED:
webAppException = new NotAuthorizedException(message);
break;
case FORBIDDEN:
webAppException = new ForbiddenException(message);
break;
case NOT_FOUND:
webAppException = new NotFoundException(message);
break;
case METHOD_NOT_ALLOWED:
webAppException = new NotAllowedException(message);
break;
case NOT_ACCEPTABLE:
webAppException = new NotAcceptableException(message);
break;
case UNSUPPORTED_MEDIA_TYPE:
webAppException = new NotSupportedException(message);
break;
case INTERNAL_SERVER_ERROR:
webAppException = new InternalServerErrorException(message);
break;
case SERVICE_UNAVAILABLE:
webAppException = new ServiceUnavailableException(message);
break;
default:
webAppException = new WebApplicationException(message);
}
throw webAppException;
}
}
}
}
I believe you want to do something like this:
Response response = builder.get( Response.class );
if ( response.getStatusCode() != Response.Status.OK.getStatusCode() ) {
System.out.println( response.getStatusType() );
return null;
}
return response.readEntity( MyEntity.class );
Another thing you can try (since I don't know where this API puts stuff -- i.e. in the header or entity or what) is:
Response response = builder.get( Response.class );
if ( response.getStatusCode() != Response.Status.OK.getStatusCode() ) {
// if they put the custom error stuff in the entity
System.out.println( response.readEntity( String.class ) );
return null;
}
return response.readEntity( MyEntity.class );
If you would like to generally map REST response codes to Java exception you can add a client filter to do that:
class ClientResponseLoggingFilter implements ClientResponseFilter {
#Override
public void filter(final ClientRequestContext reqCtx,
final ClientResponseContext resCtx) throws IOException {
if ( resCtx.getStatus() == Response.Status.BAD_REQUEST.getStatusCode() ) {
throw new MyClientException( resCtx.getStatusInfo() );
}
...
In the above filter you can create specific exceptions for each code or create one generic exception type that wraps the Response code and entity.
There are other ways to getting a custom error message to the Jersey client besides writing a custom filter. (although the filter is an excellent solution)
1) Pass error message in an HTTP header field.
The detail error message could be in the JSON response and in an additional header field, such as "x-error-message".
The Server adds the HTTP error header.
ResponseBuilder rb = Response.status(respCode.getCode()).entity(resp);
if (!StringUtils.isEmpty(errMsg)){
rb.header("x-error-message", errMsg);
}
return rb.build();
The Client catches the exception, NotFoundException in my case, and reads the response header.
try {
Integer accountId = 2222;
Client client = ClientBuilder.newClient();
WebTarget webTarget = client.target("http://localhost:8080/rest-jersey/rest");
webTarget = webTarget.path("/accounts/"+ accountId);
Invocation.Builder ib = webTarget.request(MediaType.APPLICATION_JSON);
Account resp = ib.get(new GenericType<Account>() {
});
} catch (NotFoundException e) {
String errorMsg = e.getResponse().getHeaderString("x-error-message");
// do whatever ...
return;
}
2) Another solution is to catch the exception and read the response content.
try {
// same as above ...
} catch (NotFoundException e) {
String respString = e.getResponse().readEntity(String.class);
// you can convert to JSON or search for error message in String ...
return;
}
The class WebApplicationException was designed for that but for some reason it ignores and overwrites what you specify as parameter for the message.
For that reason I created my own extension WebAppException that honors the parameters. It is a single class and it doesn't require any response filter or a mapper.
I prefer exceptions than creating a Response as it can be thrown from anywhere while processing.
Simple usage:
throw new WebAppException(Status.BAD_REQUEST, "Field 'name' is missing.");
The class:
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
import javax.ws.rs.core.Response.Status.Family;
import javax.ws.rs.core.Response.StatusType;
public class WebAppException extends WebApplicationException {
private static final long serialVersionUID = -9079411854450419091L;
public static class MyStatus implements StatusType {
final int statusCode;
final String reasonPhrase;
public MyStatus(int statusCode, String reasonPhrase) {
this.statusCode = statusCode;
this.reasonPhrase = reasonPhrase;
}
#Override
public int getStatusCode() {
return statusCode;
}
#Override
public Family getFamily() {
return Family.familyOf(statusCode);
}
#Override
public String getReasonPhrase() {
return reasonPhrase;
}
}
public WebAppException() {
}
public WebAppException(int status) {
super(status);
}
public WebAppException(Response response) {
super(response);
}
public WebAppException(Status status) {
super(status);
}
public WebAppException(String message, Response response) {
super(message, response);
}
public WebAppException(int status, String message) {
super(message, Response.status(new MyStatus(status, message)). build());
}
public WebAppException(Status status, String message) {
this(status.getStatusCode(), message);
}
public WebAppException(String message) {
this(500, message);
}
}
A much more concise solution for anyone stumbling on this:
Calling .get(Class<T> responseType) or any of the other methods that take the result type as an argument Invocation.Builder will return a value of the desired type instead of a Response. As a side effect, these methods will check if the received status code is in the 2xx range and throw an appropriate WebApplicationException otherwise.
From the documentation:
Throws: WebApplicationException in case the response status code of
the response returned by the server is not successful and the
specified response type is not Response.
This allows to catch the WebApplicationException, retrieve the actual Response, process the contained entity as exception details (ApiExceptionInfo) and throw an appropriate exception (ApiException).
public <Result> Result get(String path, Class<Result> resultType) {
return perform("GET", path, null, resultType);
}
public <Result> Result post(String path, Object content, Class<Result> resultType) {
return perform("POST", path, content, resultType);
}
private <Result> Result perform(String method, String path, Object content, Class<Result> resultType) {
try {
Entity<Object> entity = null == content ? null : Entity.entity(content, MediaType.APPLICATION_JSON);
return client.target(uri).path(path).request(MediaType.APPLICATION_JSON).method(method, entity, resultType);
} catch (WebApplicationException webApplicationException) {
Response response = webApplicationException.getResponse();
if (response.getMediaType().equals(MediaType.APPLICATION_JSON_TYPE)) {
throw new ApiException(response.readEntity(ApiExceptionInfo.class), webApplicationException);
} else {
throw webApplicationException;
}
}
}
ApiExceptionInfo is custom data type in my application:
import lombok.Data;
#Data
public class ApiExceptionInfo {
private int code;
private String message;
}
ApiException is custom exception type in my application:
import lombok.Getter;
public class ApiException extends RuntimeException {
#Getter
private final ApiExceptionInfo info;
public ApiException(ApiExceptionInfo info, Exception cause) {
super(info.toString(), cause);
this.info = info;
}
}
[At least with Resteasy] there is one big disadvantage with the solution offered by #Chuck M and based on ClientResponseFilter.
When you use it based on ClientResponseFilter, your BadRequestException, NotAuthorizedException, ... exceptions are wrapped by javax.ws.rs.ProcessingException.
Clients of your proxy must not be forced to catch this javax.ws.rs.ResponseProcessingException exception.
Without filter, we get an original rest exception. If we catch and handle by default, it does not give us much:
catch (WebApplicationException e) {
//does not return response body:
e.toString();
// returns null:
e.getCause();
}
The problem can be solved on another level, when you extract a description from the error. WebApplicationException exception, which is a parent for all rest exceptions, contains javax.ws.rs.core.Response. Just write a helper method, that in case the exception is of WebApplicationException type, it will also check the response body. Here is a code in Scala, but the idea should be clear. The methord returns a clear description of the rest exception:
private def descriptiveWebException2String(t: WebApplicationException): String = {
if (t.getResponse.hasEntity)
s"${t.toString}. Response: ${t.getResponse.readEntity(classOf[String])}"
else t.toString
}
Now we move a responsibility to show exact error, on the client. Just use a shared exception handler to minimize effort for clients.
The following works for me
Response.status(Response.Status.BAD_REQUEST).entity(e.getMessage()).build();

Java web service : User defined meta-data

I have a SOAP web service implementation on Jboss 4.2.3. I want to add a version number check for the service. Whenever a client makes a call, I will pass the client version number. I will write an interceptor at the server that would check the client version number. If it is a client with a different version number, I would not process the request.
What I want to know is if there is a way to pass the version number from the client in some context parameter other than adding it in the web service method signature?
In general, if I want to pass some custom META-DATA from client to server, how do I do it ?
In general, if I want to pass some custom META-DATA from client to
server, how do I do it ?
This can be achieved through SOAP Message Handlers both side (Client and Server ) in Jax-WS .
Client Side:
The custom-meta-data , like version number, UUID , Signature information can be added via SOAP Headers.
1..Write a VersionNumberHandler as shown below.
public class VersionNumberHandler implements SOAPHandler<SOAPMessageContext> {
private static final String LoggerName = "ClientSideLogger";
private Logger logger;
private final boolean log_p = true; // set to false to turn off
public VersionNumberHandler() {
logger = Logger.getLogger(LoggerName);
}
public boolean handleMessage(SOAPMessageContext ctx) {
if (log_p)
logger.info("handleMessage");
// Is this an outbound message, i.e., a request?
Boolean request_p = (Boolean) ctx
.get(MessageContext.MESSAGE_OUTBOUND_PROPERTY);
// Manipulate the SOAP only if it's a request
if (request_p) {
// Get the Version Number from some property file ,
// to place in the message header.
String versionNumber = "v1.0";
try {
SOAPMessage msg = ctx.getMessage();
SOAPEnvelope env = msg.getSOAPPart().getEnvelope();
SOAPHeader hdr = env.getHeader();
// Ensure that the SOAP message has a header.
if (hdr == null)
hdr = env.addHeader();
QName qname = new QName("http://ticket.example.com/",
"versionnumber");
SOAPHeaderElement helem = hdr.addHeaderElement(qname);
// In SOAP 1.2, setting the actor is equivalent to
// setting the role.
helem.setActor(SOAPConstants.URI_SOAP_ACTOR_NEXT);
helem.setMustUnderstand(true);
helem.addTextNode(versionNumber);
msg.saveChanges();
// For tracking, write to standard output.
msg.writeTo(System.out);
} catch (SOAPException e) {
System.err.println(e);
} catch (IOException e) {
System.err.println(e);
}
}
return true; // continue down the chain
}
public boolean handleFault(SOAPMessageContext ctx) {
if (log_p)
logger.info("handleFault");
try {
ctx.getMessage().writeTo(System.out);
} catch (SOAPException e) {
System.err.println(e);
} catch (IOException e) {
System.err.println(e);
}
return true;
}
public Set<QName> getHeaders() {
if (log_p)
logger.info("getHeaders");
return null;
}
public void close(MessageContext messageContext) {
if (log_p)
logger.info("close");
}
2..Mention this class in the Handler-Chain.xml.
<javaee:handler>
<javaee:handler-class>
com.example.client.handler.VersionNumberHandler
</javaee:handler-class>
</javaee:handler>
3..Add the handler-chain in the client (Stub) also.
#WebServiceClient(name = "TicketWSImplService", targetNamespace = "http://ticket.example.com/", wsdlLocation = "http://localhost:8080/ticket?wsdl")
#HandlerChain(file = "handler-chain.xml")
public class TicketWSImplService extends Service {
#WebMethod
public void method(){
}
Here, we are adding a new header element "versionnumber" and mustunderstand=true, which means the server/intermediaries has to process this element, otherwise Jax-WS-Runtime will throw SOAP Fault exception to the client. Now we need to write a Validator(SOAP Handler) at the server side to validate this version number which is being passed by the clients.
Server Side:
1..Write a VersionNumberValidator as shown below.
public class VersionNumberValidator implements SOAPHandler<SOAPMessageContext> {
#SuppressWarnings("unused")
#Override
public boolean handleMessage(SOAPMessageContext ctx) {
// Is this an inbound message, i.e., a request?
Boolean response_p = (Boolean) ctx
.get(MessageContext.MESSAGE_OUTBOUND_PROPERTY);
// Manipulate the SOAP only if it's incoming.
if (!response_p) {
try {
SOAPMessage msg = ctx.getMessage();
SOAPEnvelope env = msg.getSOAPPart().getEnvelope();
SOAPHeader hdr = env.getHeader();
// Ensure that the SOAP message has a header.
if (hdr == null) {
generateSOAPFault(msg, "No message header.");
return true;
}
Iterator mustUnderstandHeaders = msg.getSOAPHeader()
.examineMustUnderstandHeaderElements(
"http://schemas.xmlsoap.org/soap/actor/next");
String value = null;
while (mustUnderstandHeaders.hasNext()) {
Node next = (Node) mustUnderstandHeaders.next();
System.out.println("mustUnderstandHeaders name:"
+ next.getValue());
if (next.getNodeName().equalsIgnoreCase("versionnumber"))
value = next.getValue();
if (value != null && !value.equalsIgnoreCase("v1.0")) {
generateSOAPFault(msg, "Version Number Mismatch");
}
}
// For tracking, write to standard output.
msg.writeTo(System.out);
} catch (SOAPException e) {
System.err.println(e);
} catch (IOException e) {
System.err.println(e);
}
}
return true; // continue down the chain
}
#Override
public boolean handleFault(SOAPMessageContext ctx) {
return true; // do continue down the chain
}
// For now, no-ops.
#Override
public Set<QName> getHeaders() {
Set<QName> headers = new HashSet<QName>();
QName qName = new QName("http://ticket.example.com/", "versionnumber");
headers.add(qName);
return headers;
}
#Override
public void close(MessageContext messageContext) {
}
private void generateSOAPFault(SOAPMessage msg, String reason) {
try {
SOAPBody body = msg.getSOAPBody();
SOAPFault fault = body.addFault();
QName fault_name = new QName(
SOAPConstants.URI_NS_SOAP_1_2_ENVELOPE, "UltimateReceiver");
fault.setFaultCode(fault_name);
fault.setFaultRole("http://ticket.example.com/versionNumber_validator");
fault.addFaultReasonText(reason, Locale.US);
} catch (SOAPException e) {
}
}
2..Mention this class in the Handler-Chain-server.xml.
<javaee:handler>
<javaee:handler-class>
com.example.client.handler.VersionNumberValidator
</javaee:handler-class>
</javaee:handler>
3..Publish the webservices.
Now, the every client request will be having "version number =v1.0", At the server side , you will be validating this value is correct or not. If it is not correct, SOAPFaultException will be thrown.
You could add it to the http-headers but that would mean your client would need to do this which also means they can change it and give you wrong numbers causing issues on the server. It's only as reliable as the messages being sent in.
Either way, this isn't the right way to restrict access to your Web Service, you should use http basic authentication or if it's version differences then you should create multiple version endpoints giving clients access to the versions they need.
Also, JBoss 4.2.3 is so old it might not even work. See [1]
Mus
[1] https://community.jboss.org/message/534711
It's a bad idea to try to add out-of-band metadata to a web service. Just pick a new URL for each version if the data structures are incompatible. If they are compatible, put the version number inside the request.
This way you can still support interoperation with all different libraries and not require your clients to find a new hoop to jump through for each toolkit.

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