Name collision in webservice using enterprise application, Weblogic 12 - web-services

I have a web application that is using (calling) two identical webservices, they only differ in URL. I use Netbeans 8 to generate the webservice clients, both of which are in the same separate project but in two separate packages. The main application packages everything in a super jar.
Deploying the super jar to Weblogic causes a JAXBException, name collision. The relevant part of the error message:
Two classes have the XML type with uri http://yet.another/useless/namespace/url and name fault.
All of the classes have identical names, yet it's the one with the name fault that is bothering Weblogic.
I could totally separate these web services into different enterprise applications of course but that seems like overkill.
I read the WSDLs from a remote server and don't really have a chance to convince our contractor to change namespaces.

I just worked around it: I'm using Axis2 to generate client side code as I'm free to perform whatever refactoring is necessary on it to avoid name collisions. Morale of the story: Avoid IDE wizards (if they cause trouble).

Related

Best practice: WebLogic SOAP service -- should WSDL be visible?

I am going to deploy a SOAP web service on a WebLogic server.
The endpoint of the service is something like:
http://myserver.mycompany.com:1234/MyService-0.0.1-SNAPSHOT/MyServiceService
However, if (using a browser), I navigate to either
http://myserver.mycompany.com:1234/MyService-0.0.1-SNAPSHOT/MyServiceService?WSDL
-- or --
http://myserver.mycompany.com:1234/MyService-0.0.1-SNAPSHOT/MyServiceService?xsd=1
I can see the WSDL or schema file, respectively, for the service.
My group does not deploy a lot of web services (we're a back-office group and use Oracle Middleware to automate what little services we do provide), so a question has come up regarding whether exposing the WSDL file and schema file is "best practice".
Is it OK for these files to be visible, or should access to them be shutdown somehow? Conversely, is it even possible to restrict access to them, or would that interfere with clients trying to access the service?
This is an old question, but anyway.
It depends, but in my projects it was considered a bad practice to do so. You should always do Contract first, don't base your WSDL on your code or most likely you will end up with a WSDL that is somehow dependent on the programming language used for the implementation.
I don't know how Weblogic behaves but I remember that Jboss (5) used to generate the WSDL from the code any way and serve that. Even when we did Contract (WSDL) first development. So you would end up with little differences in these WSDLs which may cause problems. Exchange of the WSDL and the XML Schema files should be done by other means. It is possible to restrict access to any URI on Weblogic.
Another aspect is, that if you don't remove these, we found the developers on the clientside will start pointing their development-tools and implementation to these endpoints to get the WSDLs. This will most likely also cause problems and at least (a lot) unnecessary downloads of these files. As most frameworks will (need to) read the WSDL every time they instantiate the client-code. By not providing these endpoints, you keep the clients from these bad practices.

What is the difference between ?wsdl and ?singleWsdl parameters

My messaging provider gives me two different kinds of WSDLs to use.
http://my.amazonaws.com:8000/webservice/?wsdl
http://my.amazonaws.com:8000/webservice/?singleWsdl
The first one is an embedded WSDL. Can NOT use it to generate WSDL2java packages and
can NOT use JAX-WS to create a connection.
The second one is a single WSDL. It can generate Java packages with CXF 3.0's WSDL2java and can use JAX-WS to create a connection. It works very well.
Please let me know what is the difference between these two kinds of WSDLs.
Without knowing what those links return we can only guess, but here are some details that might help you....
Suffixing the web service endpoint with ?wsdl get's you a WSDL file. The WSDL can be generated by the framework at runtime based on the web service skeleton code or can be an actual physical file that the server just sends back when the URL parameter is specified.
The WSDL contains an XML Schema that can be specified either inside the WSDL itself or as separate files that are imported by the WSDL. And now a problem occurs...
Some web service stub generators can only handle a full WSDL, with the Schema inside. If the WSDL imports other files the tools can't resolve the imports and fails. This made web services hard to consume because clients had issues creating stubs to interact with the web service. So much so that service providers either used an actual WSDL to respond to the ?wsdl request or started writing all sorts of hacks and plugins to make the web service generate the full WSDL.
But some providers didn't even bother so clients had to write the hacks to parse the WSDL or they had to download all files, assemble them manually into a single file and use that instead.
With time people recognized this as a problem and frameworks adapted to provide the full WSDL, not one with imports. But this generated another problem. Changing what the ?wsdl URL returned could break all those hacks created around it to fix the import problem. For this reason another convention was chosen to return the full WSDL: ?singleWsdl.
So there are frameworks that generate a full WSDL, some that generate it with imports, some allow you to specify an actual physical file, some that support the ?singleWsdl convention, some that don't. Not relevant to this question, but just for completion, there is also a ?wsdl2 convention that get's you a WSDL 2.0 definition (?wsdl get you a WSDL 1.1). Some frameworks support ?wsdl2, some don't.
My guess is the issues you have are caused by Schema imports, but without the WSDLs themselves I can't tell. Hope at least that these details help you better identify the problem.

jax-ws in Weblogic 10.3.5: IllegalAnnotationsException: 2 counts of IllegalAnnotationExceptions

We have a test web application deployed In Weblogic 10.3.5. The web application contains a servlet which uses jax-ws to call a web service deployed in the same weblogic.
Accessing the servlet throws the following exception:
Two classes have the same XML type name "address". Use #XmlType.name and #XmlType.namespace to assign different names to them.
this problem is related to the following location:
at com.sun.xml.ws.developer.MemberSubmissionEndpointReference$Address
at public com.sun.xml.ws.developer.MemberSubmissionEndpointReference$Address com.sun.xml.ws.developer.MemberSubmissionEndpointReference.addr
at com.sun.xml.ws.developer.MemberSubmissionEndpointReference
this problem is related to the following location:
at javax.xml.ws.wsaddressing.W3CEndpointReference$Address
at private javax.xml.ws.wsaddressing.W3CEndpointReference$Address javax.xml.ws.wsaddressing.W3CEndpointReference.address
at javax.xml.ws.wsaddressing.W3CEndpointReference
I copied the logic of the servlet into a common java class, and ran it. The test succeeded. So the problem should lie in the web application.
I have tried many ways, modify weblogic-application.xml to add prefer-application-packages section like below, but still doesn't work.
<prefer-application-packages>
<package-name>javax.xml.ws.*</package-name>
<package-name>javax.xml.bind.*</package-name>
<package-name>javax.jws.*</package-name>
<package-name>javax.namespace.xml.*</package-name>
<package-name>javax.xml.soap.*</package-name>
<package-name>org.apache.xerces.*</package-name>
<package-name>org.apache.commons.*</package-name>
<package-name>com.sun.xml.*</package-name>
</prefer-application-packages>
Anyone can help me on this, spent several days on this bug, no progress at all.
Thanks a million for your reply in advance.
Update 1
In the web application, we don't want to use metro, just use jax-ws downloaded from java.net, and put put jaxws-rt.jar, jaxws-api.jar, jaxb and other related jars in the ear/APP-INF/lib.
WebLogic Classloader Analysis Tool (wls-cat) tells there are some classes conflict, and suggests to add prefer-application-packages in weblogic-application.xml.
So We add prefer-application-packages to tell weblogic load them from from our application, not from weblogic jax-ws/metro implmentation.
But still doesn't work.
The problem might come from the fact that you want to use Metro JaxWs in Weblogic which has it's own implementation called Oracle JaxWS (based on Metro).
Here is a link where is explained how use Metro with Weblogic :
http://metro.java.net/guide/ch02.html#weblogic-10
If you don;t use Metro and rely on Oracle JaxWS you do not have to used preferred libs or any special packaging.

Is there any problems when using Delphi to create Web-Service client?

I plan to start developing web-service client using Delphi XE. It looks like creating web-service client on delphi is easy to do.
Is there any bugs or problems when creating WebService on Delphi XE?
Is there any problems with other versions of Delphi (not XE) ?
(To create web-service i plan using WSDL-importer dialog)
Please, place Delphi version, you used to create web-service in answer.
I have created several webservice-clients in Delphi, all by using the wsdl. I have not encountered any problems so far. I have encountered some small problems, but nothin that couldn't be resolved with Google or Stackoverflow :-)
It depends. To answer your last question first, later versions of Delphi are better at generating a Web service client than earlier versions.
As for your first question. I have also created a number of Web service clients (and servers) using various versions of Delphi (most recently, Delphi 2007 and Delphi XE, though I also used Delphi 6, Delphi 7, and Delphi 2005). When the Web service methods use simple data types in its method parameters and return values (strings and integers), Delphi often does a good job of generating the client code using the WSDL importer. When complex data types are involved (objects, for example), it might be more challanging. For example, if the Web service uses complex types, and the WSDL is the only source of information about those types (you did not create the Web service, there is no documentation, or you cannot get the source code to it), it might take more work. It really depends on how complex the complex type is.
Additionally, if the Web service employs additional features such as authentication or other specialized headers, you will have to manually modify the code created by the WSDL importer. However, as birger noted, most of these issues can be resolved with research.
On the other hand, if the Web service was created in Delphi, it is usually very easy to create the Web service client.

Building web services without a web server

OK, this is impossible, but I will try to explain the situation here.
Let's say we have cases, that we need a fast setup of a web server in order to have a simple soap web service running (querying a db and so on).
In VS though, upon debugging a web project, it creates a quick ASP.NET development server without relying on the actuall IIS that might be installed on the PC.
Is there any project that does something like that?
This would be ideal for small projects, where a simple executable would get a server ready to go and would allow web services to be executed right away.
I have looked at some stuff over the net like http://msdn.microsoft.com/en-us/magazine/cc163879.aspx and http://mtaulty.com/CommunityServer/blogs/mike_taultys_blog/archive/2004/05/24/4479.aspx but they seem to be quite outdated and i am not sure how well they work (havent tested them thoroughly)
EDIT: I have build an application like the one you suggest. However, how can i implement HTTP GET/POST requests to the service using this method? I tried using WebGet after my operationcontract but it didnt work. For example, my service is at http://localhost:8080/Service and i would like to use it such as http://localhost:8080/Service/getMethod?x=2.
I believe that the development server used by Visual Studio is based off of the Cassini code base (of which there is a fork here). I also found this article on hosting the asp.net runtime. It was also created a while back (2004), but has been updated since (2008). I think a lot of the core concepts are probably still the same.
Another approach would be a roll-your-own web server using the HttpListener class. This could take some work if you want to use it for hosting asmx type services, but if you were doing RESTful services, it isn't too bad of an option (this is actually how RavenDB works if you are not hosting it under IIS).
A WCF service can be hosted in almost any kind of application, including a Windows Service or a console application. There is no need for a web server at all.
Alright,
i've done it so im posting it here to help anyone who has issues with similar problems.
Create your WCF Service file as usual and then by using ServiceHost (or WebServiceHost) you can easily create a WCF service.
In order to use GET http requests to make it simple to communicate with mobile devices (such as iphone) you can use WebGet above your service methods and make sure you manually add a service endpoint using WebHttpBinding for WebServiceHost or WebHttpBinding with an WebHttpBehavior for ServiceHost.
Then you can call your service methods such as http://localhost:port/webhttpendpointaddress/mymethod?x=2.