Re: Web Service References
Mike:
I don't know if you are talking about this sample:
https://svn.apache.org/repos/asf/incubator/tuscany/java/sca/samples/helloworld-bpel-ws/
If it's the case, the helloworld.composite does not have a reference, it
simply exposes a BPEL implementation as a service.
I think I understand a bit better the rationale for not modeling external
references as components and why components need to have an
implementation. I am fine with it since a component must belong to a domain.
I have tried to do some cross-domain work by modeling a service (external to
the domain) invoked by a BPEL implementation and I get some errors. I don't
know if anyone could help me.
Here is my composite file (I replaced the GreetingsService component by a
reference to an external web service (implemented in a different domain)):
?xml version=1.0 encoding=ISO-8859-15?
composite xmlns=http://www.osoa.org/xmlns/sca/1.0; xmlns:sca=
http://www.osoa.org/xmlns/sca/1.0; xmlns:hns=http://helloworld;
xmlns:instance=http://www.w3.org/2004/08/wsdl-instance; xmlns:tuscany=
http://tuscany.apache.org/xmlns/sca/1.0; name=helloworld targetNamespace=
http://bpel;
component name=HelloWorldService
tuscany:implementation.bpel process=hns:HelloWorld/
reference name=greetingsPartnerLink /
/component
reference name=GreetingsService
promote=HelloWorldService/greetingsPartnerLink
tuscany:interface.wsdl interface=
http://laptop2:8085/GreetingsService#wsdl.portType(Greetings)/
binding.ws wsdlElement=
http://laptop2:8085/GreetingsService#wsdl.service(GreetingsService)
instance:wsdlLocation=http://laptop2:8085/GreetingsService.wsdl/
/reference
/composite
I do get a series of errors coming from the domain trying to implement this
composite:
[java] May 22, 2008 7:44:59 AM
org.apache.tuscany.sca.contribution.processor.ExtensibleStAXArtifactProcessor
read
[java] WARNING: Element {
http://tuscany.apache.org/xmlns/sca/1.0}implementation.bpel cannot be
processed. ([row,col {unknown-source}]: [4,5])
[java] May 22, 2008 7:44:59 AM
org.apache.tuscany.sca.contribution.processor.ExtensibleStAXArtifactProcessor
read
[java] WARNING: Element {
http://tuscany.apache.org/xmlns/sca/1.0}interface.wsdl cannot be processed.
([row,col {unknown-source}]: [8,5])
[java] May 22, 2008 7:44:59 AM
org.apache.tuscany.sca.assembly.builder.impl.CompositeBuilderImpl$1 problem
[java] WARNING: No implementation for component: HelloWorldService
[java] May 22, 2008 7:44:59 AM
org.apache.tuscany.sca.assembly.builder.impl.CompositeBuilderImpl$1 problem
[java] WARNING: Reference not found for component reference:
HelloWorldService/greetingsPartnerLink
[java] May 22, 2008 7:44:59 AM
org.apache.tuscany.sca.assembly.builder.impl.CompositeBuilderImpl$1 problem
[java] WARNING: No implementation for component: HelloWorldService
[java] May 22, 2008 7:44:59 AM
org.apache.tuscany.sca.assembly.builder.impl.CompositeBuilderImpl$1 problem
[java] WARNING: Reference not found for component reference:
HelloWorldService/greetingsPartnerLink
[java] No service is declared on component HelloWorldService
BTW, of course the greetings service is up and running and I can query its
WSDL (v1.1)
In the composite I did try both wsdl.interface and wsdl.portType and got the
same result (same interface.wsdl cannot be processed)
thanks,
JJ-
On Sat, May 17, 2008 at 7:29 AM, Jean-Jacques Dubray [EMAIL PROTECTED]
wrote:
Luciano, Mike:
thanks for the detailed answer. Yes, I am aware there are different types.
I am not so concerned having to declare an implementation within the same
domain. As a matter of fact, it looks to me that it is not even within an
entire domain, but within a composite since there is an implementation type
which is implementation.composite, so the scope to which an implementation
declaration is exposed is fairly limited (which is good).
I am more concerned of cross domain interactions and in particular how,
say, a .Net based web service gets assembled. In that case you won't be
able to find a valid implementation to expose as a composite. In cross
domain interactions you are also left to use Web Services technologies
(which I'm fine with, it'd be a shame to find no real use for WS-* after all
this energy spent :-).
Do you have a sample for that use case?
thanks,
JJ-
On Sat, May 17, 2008 at 5:34 AM, Mike Edwards
[EMAIL PROTECTED] wrote:
Jean-Jacques Dubray wrote:
Luciano:
thanks, actually in the test/bpel/helloworld-reference composite
definition
you also have a component defined with a binding.ws and there to, there
is
an implementation.java element. Is it required?
!-- Simple ws-reference --
!--
component name=HelloWorldService
implementation.java class=helloworld.HelloWorldServiceImpl/
reference name=greetingsService
binding.ws uri=http://localhost:8085/GreetingsService/
/reference
/component
--
Would you consider ws
Re: Web Service References
Good point, I removed the tuscany namespace that had been added by the
Composite Editor and the errors are gone
I do get however:
[java] Starting setup
[java] [INFO] - GeronimoLog.info(79) | Using embedded Geronimo
transaction manager
[java] java.lang.NullPointerException
The same behavior is true whether I use:
interface.wsdl interface=
http://192.168.2.2:8085/GreetingsService#wsdl.interface(Greetings)/
or interface.wsdl interface=
http://192.168.2.2:8085/GreetingsService#wsdl.portType(Greetings)/
JJ-
On Thu, May 22, 2008 at 8:49 AM, Luciano Resende [EMAIL PROTECTED]
wrote:
The errors you are getting usually means that the necessary
dependencies that register processors to parse those elements are not
available (e.g implementation.bpel and interface.wsdl).
On Thu, May 22, 2008 at 8:11 AM, Jean-Jacques Dubray [EMAIL PROTECTED]
wrote:
Mike:
I don't know if you are talking about this sample:
https://svn.apache.org/repos/asf/incubator/tuscany/java/sca/samples/helloworld-bpel-ws/
If it's the case, the helloworld.composite does not have a reference, it
simply exposes a BPEL implementation as a service.
I think I understand a bit better the rationale for not modeling external
references as components and why components need to have an
implementation. I am fine with it since a component must belong to a
domain.
I have tried to do some cross-domain work by modeling a service (external
to
the domain) invoked by a BPEL implementation and I get some errors. I
don't
know if anyone could help me.
Here is my composite file (I replaced the GreetingsService component by a
reference to an external web service (implemented in a different
domain)):
?xml version=1.0 encoding=ISO-8859-15?
composite xmlns=http://www.osoa.org/xmlns/sca/1.0; xmlns:sca=
http://www.osoa.org/xmlns/sca/1.0; xmlns:hns=http://helloworld;
xmlns:instance=http://www.w3.org/2004/08/wsdl-instance; xmlns:tuscany=
http://tuscany.apache.org/xmlns/sca/1.0; name=helloworld
targetNamespace=
http://bpel;
component name=HelloWorldService
tuscany:implementation.bpel process=hns:HelloWorld/
reference name=greetingsPartnerLink /
/component
reference name=GreetingsService
promote=HelloWorldService/greetingsPartnerLink
tuscany:interface.wsdl interface=
http://laptop2:8085/GreetingsService#wsdl.portType(Greetings)http://laptop2:8085/GreetingsService#wsdl.portType%28Greetings%29
/
binding.ws wsdlElement=
http://laptop2:8085/GreetingsService#wsdl.service(GreetingsService)http://laptop2:8085/GreetingsService#wsdl.service%28GreetingsService%29
instance:wsdlLocation=http://laptop2:8085/GreetingsService.wsdl/
/reference
/composite
I do get a series of errors coming from the domain trying to implement
this
composite:
[java] May 22, 2008 7:44:59 AM
org.apache.tuscany.sca.contribution.processor.ExtensibleStAXArtifactProcessor
read
[java] WARNING: Element {
http://tuscany.apache.org/xmlns/sca/1.0}implementation.bpelhttp://tuscany.apache.org/xmlns/sca/1.0%7Dimplementation.bpelcannot
be
processed. ([row,col {unknown-source}]: [4,5])
[java] May 22, 2008 7:44:59 AM
org.apache.tuscany.sca.contribution.processor.ExtensibleStAXArtifactProcessor
read
[java] WARNING: Element {
http://tuscany.apache.org/xmlns/sca/1.0}interface.wsdlhttp://tuscany.apache.org/xmlns/sca/1.0%7Dinterface.wsdlcannot
be processed.
([row,col {unknown-source}]: [8,5])
[java] May 22, 2008 7:44:59 AM
org.apache.tuscany.sca.assembly.builder.impl.CompositeBuilderImpl$1
problem
[java] WARNING: No implementation for component: HelloWorldService
[java] May 22, 2008 7:44:59 AM
org.apache.tuscany.sca.assembly.builder.impl.CompositeBuilderImpl$1
problem
[java] WARNING: Reference not found for component reference:
HelloWorldService/greetingsPartnerLink
[java] May 22, 2008 7:44:59 AM
org.apache.tuscany.sca.assembly.builder.impl.CompositeBuilderImpl$1
problem
[java] WARNING: No implementation for component: HelloWorldService
[java] May 22, 2008 7:44:59 AM
org.apache.tuscany.sca.assembly.builder.impl.CompositeBuilderImpl$1
problem
[java] WARNING: Reference not found for component reference:
HelloWorldService/greetingsPartnerLink
[java] No service is declared on component HelloWorldService
BTW, of course the greetings service is up and running and I can query
its
WSDL (v1.1)
In the composite I did try both wsdl.interface and wsdl.portType and got
the
same result (same interface.wsdl cannot be processed)
thanks,
JJ-
On Sat, May 17, 2008 at 7:29 AM, Jean-Jacques Dubray [EMAIL PROTECTED]
wrote:
Luciano, Mike:
thanks for the detailed answer. Yes, I am aware there are different
types.
I am not so concerned having to declare an implementation within the
same
domain. As a matter of fact, it looks to me that it is not even within
Re: Sun is asking for proof that users want Sun support for SCA, A call to arms!
Jeff: IMHO, people are not emphasizing enough how significant SCA's contribution is to the evolution of the programming model of information systems (while accomplishing it without disrupting existing investments). People have been building information systems with a CRUD-Oriented Synchronous Client/Server application model for the past 40 years or so (since the OLTP days). A COSC/S is not well suited to create *composite *information systems (a.k.a connected systems). SCA augments COSC/S (without disrupting it) with an Asynchronous Inter-Action Oriented Peer-to-Peer programming model. The foundations of this programming model include bidirectional interfaces, orchestrations and assemblies (I would also add resources, but that's another debate). I have written a minibook on Composite Software Construction (free to download after registration) ( http://www.infoq.com/minibooks/composite-software-construction) If you want to see a spectacular application of SCA, think BPM, but think BPM in a totally different way that people have thought about it. Today we are hitting a hard wall in the BPM space. Lots of people have tried it without much success. SCA opens up the way to make Composite Information Systems a reality by offering a service oriented, process centric, model driven programming model. I explain the relation between BPM and SCA in this article: http://www.infoq.com/articles/seven-fallacies-of-bpm I urge you to consider the business case for creating Composite Information Systems http://www.ebpml.org/com/an_introduction_to_soa4.swf and focus on that. If people see SCA as a replacement for J2EE or Spring the interest will remain marginal. JJ- On Sat, May 17, 2008 at 12:06 PM, Jeff Anderson [EMAIL PROTECTED] wrote: To everybody out there interested in seeing SCA being more widely adopted. Recently I posted a general overview of SCA coverage at JavaWorld last week in San Francisco. Which can be found at http://agileconsulting.blogspot.com/2008/05/highlights-of-sca-at-javaworld-2008.html I spoke briefly about the SCA panel that was attended by members of IBM, Sun SAP and MCd by David Chapelle. After the panel, I had the chance to briefly speak with Peter Walker of Sun Microsystems concerning Sun support for SCA. In his opinion, Sun will probably not support SCA, because in his mind there is no user demand. Peter has actually invited me to tell him more about what users want directly on my above-mentioned blog entry. I personally think that having Sun support SCA in a more active fashion, and incorporating it into the JavaEE world would do a lot to reduce the noise around fractures within the Java community (especially from Microsoft) and would be excellent for the Java platform in general. Is anybody else concerned with Sun's lack of support? Please provide your comments at http://agileconsulting.blogspot.com/2008/05/highlights-of-sca-at-javaworld-2008.html I will make sure to forward your comments over to Peter. Feel free to share any evidence of the real world adoption of SCA and the value that it has provided. Be generic when referring to specific clients or projects if you need to protect the innocent :-). It would be great if we can provide hard evidence to convince Sun that SCA is real, valuable, and worth considering. Of course, I will also share the results of this with the community. -- Jeff Anderson http://agileconsulting.blogspot.com/ -- Jean-Jacques Dubray 425-445-4467
Re: Web Service References
Luciano: thanks, actually in the test/bpel/helloworld-reference composite definition you also have a component defined with a binding.ws and there to, there is an implementation.java element. Is it required? !-- Simple ws-reference -- !-- component name=HelloWorldService implementation.java class=helloworld.HelloWorldServiceImpl/ reference name=greetingsService binding.ws uri=http://localhost:8085/GreetingsService/ /reference /component -- Would you consider ws bindings as the preferred way to implement cross domain composites? JJ- On Fri, May 16, 2008 at 12:06 AM, Luciano Resende [EMAIL PROTECTED] wrote: Hey Jean-Jacques Dubray Let me try to respond your questions : The helloworld.composite defined in the itest/bpel/helloworld-reference defines a GreetingsServiceComponent that is implemented by a simple pojo and has its interface contract defined by a wsdl, in this case greetings.wsdl. This component does not use the binding.ws, thus is not exposed as web services. The helloworld-ws-reference does use the binding.ws to wire to the service exposed by the helloworld-ws-service sample. As for the ws binding, you can use it to consume services available on the cloud, you can see this in the demos/xml-bigbank On Thu, May 15, 2008 at 1:07 PM, Jean-Jacques Dubray [EMAIL PROTECTED] wrote: Luciano has pointed me towards a BPEL reference sample. It was constructed by using the HelloWord sample which inovkes a GreetingsService. The Greeting Service is a regular web service implemented as an SCA composite (similar to the hello-ws sample). The hello world bpel definition exposes itself a service. Even though GreetingsService is a plain vanilla Web Service its reference definition includes an implementation.java element: component name=GreetingsServiceComponent implementation.java class=greetings.GreetingsServiceImpl / service name=GreetingsService interface.wsdl interface= http://greetings#wsdl.interface(Greetings)http://greetings#wsdl.interface%28Greetings%29 / /service /component this is also true for the helloworld-ws-reference sample: reference name=HelloWorldService promote=HelloWorldServiceComponent/helloWorldService interface.java interface=helloworld.HelloWorldService / binding.ws wsdlElement= http://helloworld#wsdl.port(HelloWorldService/HelloWorldSoapPort)http://helloworld#wsdl.port%28HelloWorldService/HelloWorldSoapPort%29 / /reference Why is not a WSDL enough? The other question is if you use a WS binding, why does the service has to be part of the same domain as the consumers? Could they belong to two different SCA domains? As a matter of fact can a composite consume a WSDL reference that is not part of an SCA domain at all? thanks, -- Jean-Jacques Dubray 425-445-4467 -- Luciano Resende Apache Tuscany Committer http://people.apache.org/~lresende http://people.apache.org/%7Elresende http://lresende.blogspot.com/ -- Jean-Jacques Dubray 425-445-4467
Web Service References
Luciano has pointed me towards a BPEL reference sample. It was constructed by using the HelloWord sample which inovkes a GreetingsService. The Greeting Service is a regular web service implemented as an SCA composite (similar to the hello-ws sample). The hello world bpel definition exposes itself a service. Even though GreetingsService is a plain vanilla Web Service its reference definition includes an implementation.java element: component name=GreetingsServiceComponent implementation.java class=greetings.GreetingsServiceImpl / service name=GreetingsService interface.wsdl interface= http://greetings#wsdl.interface(Greetings) / /service /component this is also true for the helloworld-ws-reference sample: reference name=HelloWorldService promote=HelloWorldServiceComponent/helloWorldService interface.java interface=helloworld.HelloWorldService / binding.ws wsdlElement= http://helloworld#wsdl.port(HelloWorldService/HelloWorldSoapPort)/ /reference Why is not a WSDL enough? The other question is if you use a WS binding, why does the service has to be part of the same domain as the consumers? Could they belong to two different SCA domains? As a matter of fact can a composite consume a WSDL reference that is not part of an SCA domain at all? thanks, -- Jean-Jacques Dubray 425-445-4467
Re: What's next for SCA BPEL Integration
Luciano: congrats on this milestone. You might also want to consider the other way around, from an SCA component type, generate the skeleton BPEL (send/receive/invokes, partner links...). I am looking forward to build some samples with it ! JJ- On Thu, Apr 24, 2008 at 8:37 AM, Luciano Resende [EMAIL PROTECTED] wrote: Now that we are making more progress with the SCA BPEL integration and have figured out how to make References to work, let's discuss what could be the next steps on this area. Below are couple examples of what we could do next - WS-BPEL Process Introspection : Currently we are requiring SCA componentType files, we could introspect the BPEL process file to generate the component type information from it. - Integrate BEPL with the store scenario tutorial : We could add a OrderProcessing step to the store checkout, and illustrate a more real integration scenario. Other then these, we could review the SCA_ClientAndImplementationModelFor BPEL and identify other areas that we might need enhancements. Scenarios / Samples / Demos are always welcome too. Or if you have other suggestions, feel free to jump to the discussion. BTW: Copying the ODE list in case they want to jump and help, or in case they have other ideas. -- Luciano Resende Apache Tuscany Committer http://people.apache.org/~lresende http://people.apache.org/%7Elresende http://lresende.blogspot.com/ -- Jean-Jacques Dubray 425-445-4467
Re: WS outside of control
Albert:
my understanding is that SCA is based on an automatic (semantic) mapping.
The method signatures had to be the same. This is not a severe limitation
because at some point 2 interfaces have to match to communicate. The pattern
to compose arbitrary interfaces is to use a mediator component that bridges
the two interfaces. Again, this is not a big limitation, because when you
need to compose arbitrary interfaces, you could have a lot going on in the
mediator (transformation, even some state management...)
JJ-
On Fri, Mar 21, 2008 at 5:53 AM, Albert Rainer [EMAIL PROTECTED] wrote:
I'm giving a lecture in Web Service Composition at the Vienna University
of Technology and I want to use tuscany as an advances technique for system
configuration. But first of all I've to understand the technology befor
annoying my students. I've gone through the examples but didn't find any
solution for my problem.
:
I have a composite that defines a component and binds it to a Web Service
outside of my control, somewhere on the Web.
The service is axis2 and generated from a Java class.
package at.move;
public class MathService {
public double addiere(double a,double b){
return a+b;
}
public int aufrunden(double a){
return (int)Math.ceil(a);
}
}
The Calculaor.composite looks like that:
composite xmlns=http://www.osoa.org/xmlns/sca/1.0;
targetNamespace=http://sample;
xmlns:sample=http://sample;
name=Calculator
component name=CalculatorServiceComponent
implementation.java class=
calculator.CalculatorServiceImpl/
reference name=addService
binding.ws uri=
http://localhost:8080/zong/services/MathService; /
/reference
reference name=subtractService
target=SubtractServiceComponent/reference
reference name=multiplyService
target=MultiplyServiceComponent/reference
reference name=divideService
target=DivideServiceComponent/reference
/component
component name=SubtractServiceComponent
implementation.java class=calculator.SubtractServiceImpl/
/component
...
/composite
The idea is: For the addService and method add() I want to use the The Web
Service with the method: addiere()
I need to map the AddService to the MathService and the add method from
the Calculator to the addiere method from MathService
@Reference
public void setAddService(AddService addService) {
this.addService = addService;
}
public double add(double n1, double n2) {
return addService.add(n1, n2);
}
What steps are required in order to achieve such a mapping? Or is this not
in the intetntion of tuscany and it is not possible?
Many thanks in advance.
Dr. Albert Rainer
EC3 - Electronic Commerce Competence Center
www.ec3.at
Donau-City Strasse 1
A-1220 Wien
Tel: +43 1 522 71 71 - 33
Fax: +43 1 522 71 71 - 71
-
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--
Jean-Jacques Dubray
425-445-4467
Re: Conversation and Message exchange patterns
Simon: my understanding is that it cannot be done with BPEL yet. Do you know if this can be achieved with pure Web Services (regardless of whether they have been written in Java or not). JJ- On Thu, Mar 13, 2008 at 12:05 PM, Simon Laws [EMAIL PROTECTED] wrote: On Wed, Mar 12, 2008 at 3:35 PM, James, Steven [EMAIL PROTECTED] wrote: We are investigating using SCA and are trying to understand if SCA could support complex Message exchange patterns (MEP's). What I mean by MEP is similar to those defined by WSDL 2.0 i.e. In-out Out-Only etc. I have been looking at the conversation capabilities of SCA and am starting to think we could create our message patterns using this mechanism. The types of pattern we are intrested in are for instance the ability to make a request and then get a configurable number of progress updates. Is this possible using conversations? in addition is there any language or transport constraints to this? Best regards, Steve. This e-mail and any attachment is for authorised use by the intended recipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Hi Steve Welcome to Tuscany! Let me make sure I have your scenario correct then we can work up some sample interface together for how to make it work. So IIUC you have service A and service B and they call each other as follows: A calls B.doSomething asynchronously B calls A.progressReport B calls A.progressReport B calls A.progressReport The progress reports stops after a set number have been delivered? On the language or transport constraints to this point. The general support for conversations, callbacks etc is good for Java over the SCA and WebServices bindings. I don't think other languages/transports have been addressed but I'm sure someone will jump in and correct me. Regards Simon -- Jean-Jacques Dubray 425-445-4467
