Am pretty new to web services and have been trying to implement Soap Faults. I used Apache Axis2 to generate webservice in the following manner.
public interface XYZ{
public String myMethod(User[] user)
}
Here I have created a User class with some variables so that I can generate User object at .Net environment to pass User[] of objects.
Public class Webservice implements XYZ
{
Public String myMethod(User[] user){
//My implementation
}
}
Now, I created a dynamic project using Eclipse and with the help of Axis2 plugin I created webservice for my "Webservice" class which generates wsdl file. I deployed the webcontent in the Tomcat folder and able to access the WSDL file in the .Net environment. I am able to pass array of objects (User[]) from .Net to Java and able to do my task. Now, I need to implement Soap Faults in Java which I am not sure how to implement.
Can anyone help me with an example or tutorial ?
Your best bet is to Google for something like "jax-ws faults". For example:
http://www.ibm.com/developerworks/webservices/library/ws-jaxws-faults/index.html
You can also implement an error handler, as discussed under "Using handlers in JAX-WS Web services" here:
http://axis.apache.org/axis2/java/core/docs/jaxws-guide.html#BottomUpService
Most frameworks will trigger a SOAP fault when you throw an Exception in the method implementing your operation. That will not give you much control on the SOAP fault content though.
See here for some details on Axis
Generally, You don't need any specific coding for implementing SOAP fault.. Whenever there is any exception thrown by the method (here myMethod in your example.), axis will automatically generate SOAPFault element in the resulting response. The exception is actually wrapped into AxisFault exception and sent to the client.
See here a i.
Related
I am trying to migrate a web service from IIS to Websphere. I have created a Java class containing the services as well as the necessary supporting classes. I have used exactly the same names in Java as were used in C#.
The web service is then generated from the service class using a wizard. JAX-WS and Document/Wrapped are selected. However, the service response differs from the original.
Original:
<StaffAttendingResponse xmlns="http://acme.com/">
<StaffAttendingResult>
<StaffAttendance>
<Guid>edffd67b-c7dc-4fe6-bc3c-846bf04e4ac6</Guid>
<Name>Wonka</Name>
<Vorname>Willy</Vorname>
...
Websphere:
<StaffAttendingResponse xmlns="http://acme.com/">
<return>
<guid>edffd67b-c7dc-4fe6-bc3c-846bf04e4ac6</guid>
<name>Wonka</name>
<vorname>Willy</vorname>
...
The response is a list of StaffAttendance objects. The Java version is missing the StaffAttendingResult node, the StaffAttendance nodes are called return and the object attributes are all lowercase.
I have tried using the Document/Bare option but wsgen throws an exception and does not complete the generation.
The only web services I've ever integrated with or used have been RESTful. I'm now trying to integrate with a 3rd party SOAP service and am awe-struck at how seemingly convoluted SOAP appears to be.
With REST, I use a JAX-RS client called Jersey that makes hitting RESTful endpoints a piece a' cake. For instance, if a service is exposing a POST endpoint at http://api.example.com/fizz (say, for upserting Fizz objects), then in Jersey I might make a service client that looks like this (pseudo-code):
// Groovy pseudo-code
class Fizz {
int type
boolean derps
String uid
}
class FizzClient {
WebResource webResource = initAt("https://api.example.com")
upsertFizz(Fizz fizz) {
webResource.path("fizz").post(fizz)
}
}
But Java-based SOAP clients seem, at first blush, to be fairly more complicated. If I understand the setup correctly, the general process is this:
Obtain an XML document called a WSDL from the service provider; this appears to be a language-agnostic description of all the available endpoints
Run a JDK tool called wsimport on the WSDL which actually generates Java source code, which implements JAX-WS APIs and actually represents my SOAP client
Import those generated source files into my project and use them
First off, if anything I have said about this process is incorrect, please begin by correcting me! Assuming I'm more or less correct, what I don't understand is: why is this necessary if its all an HTTP conversation? Why couldn't I achieve SOAP-based conversations with Jersey, and bypass all this source-generation boilerplate?
For instance, say the same endpoint exists, but is governed by SOAP:
class FizzClient {
WebResource webResource = initAt("https://api.example.com")
FizzSerializer serializer // I take Fizz instances and turn them into XML
FizzDeserializer deserializer // I take XML and turn them into Fizz instances
upsertFizz(Fizz fizz) {
String xmlFizz = serializer.serialize(fizz)
webResource.path("fizz").post(xmlFizz)
}
}
If I understand SOAP correctly, its just a way of utilizing HTTP verbs and request/response entities to send app-specific messages around; it's an HTTP "conversation". So why couldn't I hijack a REST framework like Jersey to HTTP POST messages, and in doing so, bypass this SOAP overhead?
This is going to attract opinion-based answers, but first, you should understand that
jax-rs is much younger than jax-ws (jax-ws had a final draft in 2006, JAX-RS came out in 2008-9).
RESTful webservices standard, for many purposes is quite amorphous - many businesses prefer the comfort of a contract in the form of a WSDL.
Not to mention that JAX-WS, in concert with WS-I provides many other standards that govern security, message reliability and other enterprise-goodies (under the generic "WS-*" banner) that businesses care about. There's a hodge-podge of libraries that are attempting to get that kind of uniformity on to the jax-rs platform, but for now, jax-ws/WS-I is the industry standard
I've written an an API giving some methods like
runApp();
stopApp();
doSomethingElse();
currently I have a jar file with which I run these methods.
I want to be able to invoke these method by http.
For example, going to : http://localhost:8080/something/runApp
will invoke runApp() method.
I've heard that this should be done with webservices, and particularly REST API.
Is webservices the only way to achieve this?
And if so, can someone summarize the simplest ways to implement this ability, or point me to an existent summary?
Thanks.
Here's a RESTful API example based on your pseudocode, with JAX-RS:
#Path("/something")
public class MyApp {
#GET
#Path("/runApp")
public Response runApp() {
return Response.ok("Running app").build();
}
#GET
#Path("/stopApp")
public Response stopApp() {
return Response.ok("Stopping app").build();
}
#GET
#Path("/doSomethingElse") {
return Response.ok("Doing something else").build();
}
}
Which when built and deployed into any JEE5 or JEE6 web capable container will allow you to access services those services at:
http://localhost:8080/something/runApp
http://localhost:8080/something/stopApp
http://localhost:8080/something/doSomethingElse
Assuming your server is running on localhost:8080, of course. Having said that, nothing in this example is really RESTful, and would be better implemented using JAX-WS.
You've pretty much described exactly what a web service is. Code gets run when you hit a particular URL with a particular type of request.
As to how to build a web service in Java, there's a huge amount of documentation out there on the web (and SO) on that. You should not have any trouble finding useful articles.
I've been gradually piecing together how I can receive a serialized object within Spring and have gotten a web service working, by following a tutorial, that uses Jax-WS. I have verified that I can access this basic service through a browser by pulling up the XML page using a url like http://localhost:8080/WebServicesExample/hello?wsdl
The code I currently have is like below, however I want to make a service so that a serialized object can be passed in, for example a HashMap and then have spring de-serialize it, etc. I have been doing a lot of reading on this but am still a bit lost, I would appreciate if anyone can offer advice how to get from where I am at currently to what I am trying to do. Thanks
import javax.jws.WebMethod;
import javax.jws.WebService;
import com.mkyong.bo.HelloWorldBo;
#WebService
public class HelloWorldWS{
//DI via Spring
HelloWorldBo helloWorldBo;
#WebMethod(exclude=true)
public void setHelloWorldBo(HelloWorldBo helloWorldBo) {
this.helloWorldBo = helloWorldBo;
}
#WebMethod(operationName="getHelloWorld")
public String getHelloWorld() {
return helloWorldBo.getHelloWorld();
}
}
I am not completely sure which WS stack you have used for exposing this service, assuming that you just want to create a JAX-WS based sample, let me point you to a working sample that I had created earlier available at : git://github.com/bijukunjummen/memberservice-codefirst.git .
This sample uses Apache CXF as the JAX-WS implementation, and uses JAXB2 for binding (converting the incoming xml to Java objects and back)
In your example, Apache CXF would allow you to expose a WS interface using an entry into spring configuration files of the type:
<jaxws:endpoint address="/helloworldservice" id="helloworld" implementor="#helloworldBean" >
</jaxws:endpoint>
When defining a simple web service in Java (Eclipse) and consuming the service in Visual Studio, the generated code contains a request and response structure for each service method. The generated client interface has methods that accept the request structure and return the value from the response structure.
For instance, if I have a service class SimpleTest with a method add(int a, int b), I get the following generated interface (annotations removed):
public interface ISimpleTest
{
MyNamespace.WebServiceProxy.addResponse add(
MyNamespace.WebServiceProxy.addRequest request);
}
However, if I create essentially the same class as a WCF web service, the code generates the following interface:
public interface ISimpleTest
{
int Add(int a, int b);
}
I'd like to figure out if there's a way to avoid using the wrapper classes when consuming a Java service. Would defining datatypes in an XSD allow this or will .NET always generate these wrappers when consuming a non-.NET service? We'd like to bypass the generated client and implement the interface ourselves (without the wrappers). Is this possible?
You can definitely do this using WCF. You should be able to define your interface on the client side like so:
[ServiceContract]
public interface ISimpleTest
{
[OperationContract]
int Add(int a, int b);
}
From there, you can configure the implementation of your client through the client config or through code.
If I had to guess it is because Visual Studio for an external web service (Java, Perl, Ruby, etc) needs to go download the WSDL from that service and then generate the .NET stubs based on the WSDL which is the interface of all web services.
With a WCF Web Service it already has access to the classes etc for proxying so it doesn't need to generate the stubs and skeletons to call the web service.
This is just a guess though...
The only way to do it without the wrapper is if you created all the SOAP requests responses yourself and sent them over raw HTTP to the web service. This is messy code and the whole reason the .NET wrapper generator exists to shield you from that mess!