Webservices Architectures

Where can I get information now real world examples of webservices in action, and then high level modeling designs or implementation for the examples?
There seem to be so many different uses of webservices. I would like to get practical knowledge on the most powerful and useful methods.
(I'm interested from a Java backend perspective.)
For example, one client of mine currently processes data entered mainly through a webapp. A developer has given them a way to upload CSV files of data into the system for processing. We've had more that one issue of commas in the values. XML would be a much better way serialize. I understrand how using XSLT, or just xml digester, I can read in and validate the data. But, how do the users create XML from csv files? Do I need to build a client side app? Or am I missing something here?
Thanks
jdkGene

Either this was a difficult question or no one wants to share their favorite books :-)
For now I settled for the German book "Masterkurs Client/Server-Programmierung mit Java: Anwendungen entwickeln mit JDBC, Sockets, XML-RPC, RMI und JMS - Kompakt und praxisnah - Zahlreiche Programmbeispiele und Aufgaben". But I'm still very much interested in other titles on the choices, trade-offs, architecture, when to use web-services, etc.

Similar Messages

Webservice architecture question

Hi,
I want to build a web service that calls another (non-web) service to get some xml and then transform that xml before returning it to the client. I've read about the message handlers and XQuery Mapping, but I'm not sure that's the right way to go.
If I weren't using WebLogic, I suppose I would just use a XSLT engine to do the transform in the java code of the web service. I'd really like to leverage what WebLogic offers though (plus the fact that I'm hoping XQuery will be easier than xslt).
Thanx for your help!
M

Hi,
I want to build a web service that calls another (non-web) service to get some xml and then transform that xml before returning it to the client. I've read about the message handlers and XQuery Mapping, but I'm not sure that's the right way to go.
If I weren't using WebLogic, I suppose I would just use a XSLT engine to do the transform in the java code of the web service. I'd really like to leverage what WebLogic offers though (plus the fact that I'm hoping XQuery will be easier than xslt).
Thanx for your help!
M

SOAP and HTTP

Hello Friends,
1)In one of the scenarios ..They are implementing HTTP Is it better to implement
HTTP for Synchronous receiver side or It would be advisable to use SOAP for Syn Receiver side.
2)Can Reciver HTTP handles Syn communication.

Satya Kumar,
1) SOAP messages are more secure and since most applicatioins are moving towards a webservice architecture you would be better off with a soap adapter. All things considered equal SOAP is a better choice.
2) I dont think plain receiver HTTP can handle sync comm.
regards,
Arvind R

How to join the results from 2 webservices using BPEL?Architecture question

Hi,
I am new to BPEL. BPEL process calls two webservices, which return complex results. I need to process the results from 2 webservices using BPEL .The result will be a complex xml, join/merge of previous results.
What is the best practice to do it with BPEL?
I see three ways:
1.To do the processing (join/ merge) inside the BPEL process itself and return complex xml.
2.Develop auxiliary webservice in java. Auxiliary webservice will do the processing (join/merge). Call this webservice from BPEL process.
3.Do a plain concatenation of the two XMLs in BPEL and forward it to the frontend. Frontend then will do all the logic on its side
Thanks,
Boris

you could process the XMLs one at a time, and use XSL transformations to process the payload to a target schema.
Activity 1:
output from webservice1 -> transform 1 -> partial XML (of target schema)
Activity 2:
output from webservice2 -> transform 2 -> completed XML (of target schema)
Regards,
Shanmu.

Questions on the @ServiceClient annotation and Asynchronous webservices

1. Is their a way to invoke a webservice in an asynchronous manner without using the @ServiceClient annotation? I’ve tried a few things to get access to the async versions of the web methods and each time I get an exception stating “java.rmi.RemoteException: Asynchronous methods can only be invoked from stubs with the ServiceClient annotation”.
2. Is their anyway to generate a dynamically sized array of service port variables with the @ServiceClient annotation? All the examples that I have seen only have a single port variable annotated with @ServiceClient. I’ve tried creating a class that uses the @ServiceClient annotation, and while it does compile it fails when I try to invoke the services methods. I also found in some documentation a restriction that the @ServiceClient annotation can only be used in the core java (jws) webservice class.
3. Is their a way to use a single service port variable with the @SeriviceClient annotation to invoke multiple calls to an asynchronous web method if that web method is part of a conversation? When I tried this I found that even though the asynchrounous calls were going out with any problems they were being processed serially on the target services side (I assume due to the conversation).
The problem I am trying to solve is I need to invoke a stateful webservice in an asynchronous manner multiple times from the same starting service.

Hi
That is how I understand that document:
Locking: Forms, by default, locks a row as soon as the user starts modifying the data. That is pessimistic locking. Apex, on other hand (and optionally forms also) do not lock the record, but before applying any changes checks if the data has changed since the user queried it (what for some reason is called optimistic "locking")
DB connections: I am not sure why they used the terms synchronous/asynchronous, but the difference is that Forms, by default, keeps an permanent DB connection while the user is using the application, while Apex gets a connection from a connection pool every time a page is requested/submitted.
Architecture: Forms (in its web version at least) has 3 tiers: the browser, the appserver where the forms service runs and the database. As Apex runs inside the database, there are only 2 tiers: the browser and the database (though you still may need an http server in between which serves static content, I don't think it is considered part of the application in this context). If you are talking about client/server forms, then there are only 2 tiers.
I hope this helps!
Luis

Error in WebDynpro with WebServices

Hi all,
Im getting some errors using applications deployed in WEB AS SP9 that runs as a WebDynpro IView in EP.
Running the application as standalone (out of EP) this works fine.
NetWeaver Developer Studio 2.0.9
WebDynpro application using WebServices that access Oracle 8i database in the follow sequence:
WebServices -> Session Bean stateless -> Entity Bean CMP (manage connections; generate sql code, etc.)
In WebDynpro application we import WebService Model by the follow sequence:
New Model - Import Web Service Model - Local Server for WSDL Source - <WebService deployed>
In each WebServices we have created these methods:
findByID(ID);
getAll();
insert(parameters);
remove(ID);
update(parameters);
We guess that the error is generated in Entity Bean because all WebServices generate these errors.
Error 1 - Application with WebServices Model
Error stacktrace:
com.sap.tc.webdynpro.repository.RepositoryRuntimeException: Repository Object br.com.xxx.fluxo.Fluxo/ComponentInterface:FluxoInterface/InterfaceViews:CadastroSituacaoFluxoInterfaceView/InboundPlugs:Default associated via relation RepositoryObjectRelation(br.com.xxx.fluxo.application.CadastroSituacaoFluxoApp, StartupPlug) does not exist.
 at com.sap.tc.webdynpro.repository.RelationToOne.resolveTargets(RelationToOne.java:124)
 at com.sap.tc.webdynpro.repository.RelationToOne.mergeTargets(RelationToOne.java:108)
 at com.sap.tc.webdynpro.repository.RelationToOne.mergeTargets(RelationToOne.java:72)
 at com.sap.tc.webdynpro.repository.RelationToOne.getTarget(RelationToOne.java:174)
 at com.sap.tc.webdynpro.repository.RepositoryObject.getRelatedModelObject(RepositoryObject.java:349)
 at com.sap.tc.webdynpro.progmodel.repository.IWDApplicationInfo$Implementation.getStartupPlugInternal(IWDApplicationInfo.java:319)
 at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.init(ClientApplication.java:355)
 at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.execute(WebDynproMainTask.java:593)
 at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:59)
 at com.sap.tc.webdynpro.clientserver.cal.ClientManager.doProcessing(ClientManager.java:249)
 at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doWebDynproProcessing(DispatcherServlet.java:154)
 at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:116)
 at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doGet(DispatcherServlet.java:48)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:385)
 at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:263)
 at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:340)
 at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:318)
 at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:821)
 at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:239)
 at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)
 at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:147)
 at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37)
 at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71)
 at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
 at java.security.AccessController.doPrivileged(Native Method)
 at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:94)
 at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:162)
-- end --
Error 2 - Application with WebServices Model
An error has occurred:
"Failed to process the request."
Please contact your system administrator.
Hide details
Web Dynpro client:
HTML Client
Web Dynpro client capabilities:
User agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.1.4322), version: null, DOM version: null, client type: msie6, client type profile: ie6, ActiveX: enabled, Cookies: enabled, Frames: enabled, Java applets: enabled, JavaScript: enabled, Tables: enabled, VB Script: enabled
Web Dynpro runtime:
Vendor: SAP, Build ID: 6.4009.00.0000.20041011171310.0000 (release=630_VAL_REL, buildtime=2004-10-19:21:48:59[UTC], changelist=290362, host=PWDFM026)
Web Dynpro code generators of DC local/Apontamentos:
SapDictionaryGenerationCore: 6.4009.00.0000.20040910101802.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:31:53[UTC], changelist=280522, host=PWDFM026.wdf.sap.corp)
SapMetamodelWebDynpro: 6.4009.00.0000.20040910102423.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:36:19[UTC], changelist=280539, host=PWDFM026.wdf.sap.corp)
SapMetamodelCore: 6.4009.00.0000.20040730142052.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:26:00[UTC], changelist=269100, host=PWDFM026.wdf.sap.corp)
SapWebDynproGenerationTemplates: 6.4009.00.0000.20041011171310.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:54:34[UTC], changelist=290362, host=PWDFM026)
SapWebDynproGenerationCTemplates: 6.4009.00.0000.20041011171310.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:54:34[UTC], changelist=290362, host=PWDFM026)
SapGenerationFrameworkCore: 6.4009.00.0000.20040910102127.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:25:03[UTC], changelist=280527, host=PWDFM026.wdf.sap.corp)
SapIdeWebDynproCheckLayer: 6.4009.00.0000.20040910102318.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:41:01[UTC], changelist=280536, host=PWDFM026.wdf.sap.corp)
SapMetamodelDictionary: 6.4009.00.0000.20040609163924.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:29:01[UTC], changelist=253570, host=PWDFM026.wdf.sap.corp)
SapMetamodelCommon: 6.4009.00.0000.20040730142052.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:26:11[UTC], changelist=269100, host=PWDFM026.wdf.sap.corp)
SapWebDynproGenerationCore: 6.4009.00.0000.20040910102318.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:41:33[UTC], changelist=280536, host=PWDFM026.wdf.sap.corp)
SapDictionaryGenerationTemplates: (unknown)
Web Dynpro code generators of DC sap.com/tcwddispwda:
No information available
Web Dynpro code generators of DC sap.com/tcwdcorecomp:
No information available
J2EE Engine:
6.40 patchlevel 87037.313
Java VM:
Java HotSpot(TM) Server VM, version: 1.4.2_06-b03, vendor: Sun Microsystems Inc.
Operating system:
Windows 2000, version: 5.0, architecture: x86
Error stacktrace:
com.sap.tc.webdynpro.services.exceptions.WDRuntimeException: Did not find repository information for controller NotProductiveEventController
 at com.sap.tc.webdynpro.progmodel.generation.DelegatingComponent.createCustomController(DelegatingComponent.java:55)
 at com.sap.tc.webdynpro.progmodel.controller.Component.getCustomControllerInternal(Component.java:428)
 at com.sap.tc.webdynpro.progmodel.controller.Component.getMappableContext(Component.java:371)
 at com.sap.tc.webdynpro.progmodel.controller.Component.getMappableContext(Component.java:400)
 at com.sap.tc.webdynpro.progmodel.context.MappingInfo.init(MappingInfo.java:138)
 at com.sap.tc.webdynpro.progmodel.context.NodeInfo.init(NodeInfo.java:746)
 at com.sap.tc.webdynpro.progmodel.context.NodeInfo.init(NodeInfo.java:761)
 at com.sap.tc.webdynpro.progmodel.context.Context.init(Context.java:40)
 at com.sap.tc.webdynpro.progmodel.controller.Controller.init(Controller.java:199)
 at com.sap.tc.webdynpro.progmodel.view.ViewManager.getView(ViewManager.java:540)
 at com.sap.tc.webdynpro.progmodel.view.ViewManager.bindRoot(ViewManager.java:422)
 at com.sap.tc.webdynpro.progmodel.view.ViewManager.init(ViewManager.java:130)
 at com.sap.tc.webdynpro.progmodel.view.InterfaceView.initController(InterfaceView.java:41)
 at com.sap.tc.webdynpro.progmodel.controller.Controller.init(Controller.java:200)
 at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.displayToplevelComponent(ClientComponent.java:134)
 at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.init(ClientApplication.java:374)
 at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.execute(WebDynproMainTask.java:593)
 at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:59)
 at com.sap.tc.webdynpro.clientserver.cal.ClientManager.doProcessing(ClientManager.java:249)
 at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doWebDynproProcessing(DispatcherServlet.java:154)
 at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:116)
 at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doGet(DispatcherServlet.java:48)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:385)
 at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:263)
 at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:340)
 at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:318)
 at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:821)
 at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:239)
 at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)
 at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:147)
 at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37)
 at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71)
 at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
 at java.security.AccessController.doPrivileged(Native Method)
 at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:94)
 at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:162)
Error 3 - Application with RFC Model
An error has occurred:
"Failed to process the request."
Please contact your system administrator.
Hide details
Web Dynpro client:
HTML Client
Web Dynpro client capabilities:
User agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.1.4322), version: null, DOM version: null, client type: msie6, client type profile: ie6, ActiveX: enabled, Cookies: enabled, Frames: enabled, Java applets: enabled, JavaScript: enabled, Tables: enabled, VB Script: enabled
Web Dynpro runtime:
Vendor: SAP, Build ID: 6.4009.00.0000.20041011171310.0000 (release=630_VAL_REL, buildtime=2004-10-19:21:48:59[UTC], changelist=290362, host=PWDFM026)
Web Dynpro code generators of DC local/Apontamentos:
SapDictionaryGenerationCore: 6.4009.00.0000.20040910101802.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:31:53[UTC], changelist=280522, host=PWDFM026.wdf.sap.corp)
SapMetamodelWebDynpro: 6.4009.00.0000.20040910102423.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:36:19[UTC], changelist=280539, host=PWDFM026.wdf.sap.corp)
SapMetamodelCore: 6.4009.00.0000.20040730142052.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:26:00[UTC], changelist=269100, host=PWDFM026.wdf.sap.corp)
SapWebDynproGenerationTemplates: 6.4009.00.0000.20041011171310.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:54:34[UTC], changelist=290362, host=PWDFM026)
SapWebDynproGenerationCTemplates: 6.4009.00.0000.20041011171310.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:54:34[UTC], changelist=290362, host=PWDFM026)
SapGenerationFrameworkCore: 6.4009.00.0000.20040910102127.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:25:03[UTC], changelist=280527, host=PWDFM026.wdf.sap.corp)
SapIdeWebDynproCheckLayer: 6.4009.00.0000.20040910102318.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:41:01[UTC], changelist=280536, host=PWDFM026.wdf.sap.corp)
SapMetamodelDictionary: 6.4009.00.0000.20040609163924.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:29:01[UTC], changelist=253570, host=PWDFM026.wdf.sap.corp)
SapMetamodelCommon: 6.4009.00.0000.20040730142052.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:26:11[UTC], changelist=269100, host=PWDFM026.wdf.sap.corp)
SapWebDynproGenerationCore: 6.4009.00.0000.20040910102318.0000 (release=630_VAL_REL, buildtime=2004-10-18:21:41:33[UTC], changelist=280536, host=PWDFM026.wdf.sap.corp)
SapDictionaryGenerationTemplates: (unknown)
Web Dynpro code generators of DC sap.com/tcwddispwda:
No information available
Web Dynpro code generators of DC sap.com/tcwdcorecomp:
No information available
J2EE Engine:
6.40 patchlevel 87037.313
Java VM:
Java HotSpot(TM) Server VM, version: 1.4.2_06-b03, vendor: Sun Microsystems Inc.
Operating system:
Windows 2000, version: 5.0, architecture: x86
Error stacktrace:
com.sap.tc.webdynpro.services.exceptions.WDRuntimeException: Did not find repository information for controller ZMANPP012Controller
 at com.sap.tc.webdynpro.progmodel.generation.DelegatingComponent.createCustomController(DelegatingComponent.java:55)
 at com.sap.tc.webdynpro.progmodel.controller.Component.getCustomControllerInternal(Component.java:428)
 at com.sap.tc.webdynpro.progmodel.controller.Component.getMappableContext(Component.java:371)
 at com.sap.tc.webdynpro.progmodel.controller.Component.getMappableContext(Component.java:400)
 at com.sap.tc.webdynpro.progmodel.context.MappingInfo.init(MappingInfo.java:138)
 at com.sap.tc.webdynpro.progmodel.context.NodeInfo.init(NodeInfo.java:746)
 at com.sap.tc.webdynpro.progmodel.context.NodeInfo.init(NodeInfo.java:761)
 at com.sap.tc.webdynpro.progmodel.context.Context.init(Context.java:40)
 at com.sap.tc.webdynpro.progmodel.controller.Controller.init(Controller.java:199)
 at com.sap.tc.webdynpro.progmodel.view.ViewManager.getView(ViewManager.java:540)
 at com.sap.tc.webdynpro.progmodel.view.ViewManager.bindRoot(ViewManager.java:422)
 at com.sap.tc.webdynpro.progmodel.view.ViewManager.init(ViewManager.java:130)
 at com.sap.tc.webdynpro.progmodel.view.InterfaceView.initController(InterfaceView.java:41)
 at com.sap.tc.webdynpro.progmodel.controller.Controller.init(Controller.java:200)
 at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.displayToplevelComponent(ClientComponent.java:134)
 at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.init(ClientApplication.java:374)
 at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.execute(WebDynproMainTask.java:593)
 at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:59)
 at com.sap.tc.webdynpro.clientserver.cal.ClientManager.doProcessing(ClientManager.java:249)
 at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doWebDynproProcessing(DispatcherServlet.java:154)
 at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:116)
 at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doGet(DispatcherServlet.java:48)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:385)
 at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:263)
 at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:340)
 at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:318)
 at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:821)
 at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:239)
 at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)
 at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:147)
 at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37)
 at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71)
 at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
 at java.security.AccessController.doPrivileged(Native Method)
 at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:94)
 at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:162)

Hi,
I feel this error is nothing to do with webservice model.
Please check your application properties like startupPlug,Interface View etc. Set the properties correctly and deploy once again.
Regards, VIP

Exposing a webservice on ECC 5.0 in a load balancing setup

Hi
We have a webservice exposed on ECC 5.0 that is being invoked by an external system. When we move this webservice to our production environment - which is load balanced and has a logon group setup - we need to be able to expose this webservice - not on a single application server - but be available on the logon group ( message server ) so that the url that we provide for the webservice to the external system does not contain a single application server - but points to the logon group. We do not have a web dispatcher in our environment/architecture.
How do we go about exposing this point-to-point webservice on ECC 5.0 in a load balanced setup ? Any suggestions, experiences that can be shared ?

This can be done though SICF.
If you click on a service, their is a service data tab.
underthat tab is a Load Balancing option.
This then points the service at the SMLG logon group.
Regards
James

Problem while Consuming Java Webservice from WCF client

Hi,
I am trying to Consume Java Webservice from WCF client.The webservice main functionality is digital data management.The client can Query Digital data and upload digital data by calling webservice methods.Problem is when i am trying to call webmethod from WCF client its giving "Unrecognised message versions".I have no idea about how the message objects are processed at serverside.but at server side they have used JAXP for XML document parsing.
The response content type is Multipart/related and applicatio/XOP+XML.
Can u plz help me how to handle this situation.I have minimum knowledge in Java WS architecture.Basically i am .Net programmer.
Can U please guide me in a proper way to resolve the problem.

Hi Abinash,
I have the same problem. Have you solve that problem?
I am using a java program to call a webservice too. And I have generated the client proxy definition for Stand alone proxy using NWDS. When I call the method of the webservice I am getting the correct result but along with the result I am getting one error and one warning message in the output.
The java code to call the webservice is as follows.
MIDadosPessoaisSyncService service = new MIDadosPessoaisSyncServiceImpl();
MIDadosPessoaisSync port = service.getLogicalPort("MIDadosPessoaisSyncPort");
port._setProperty("javax.xml.rpc.security.auth.username","xpto");
port._setProperty("javax.xml.rpc.security.auth.password","xpto");
String out = port.MIDadosPessoaisSync("xpto", "xpto");
System.out.println(out);
The result I am getting is :
Warning ! Protocol Implementation [com.sap.engine.services.webservices.jaxrpc.wsdl2java.features.builtin.MessageIdProtocol] could not be loaded (NoClassDefFoundError) !
Error Message is :com/sap/guid/GUIDGeneratorFactory
The result of the WS is correct!!!
The Java project does not have any warning. But the stand alone proxy project has following warnings associated with it.
This method has a constructor name MIDadosPessoaisSync.java
The import javax.xml.rpc.holders is never used MIDadosPessoaisSyncBindingStub.java
The import javax.xml.rpc.encoding is never used MIDadosPessoaisSyncBindingStub.java
The constructor BaseRuntimeException(ResourceAccessor, String, Throwable) is deprecated MIDadosPessoaisSyncBindingStub.java
It is very similar with your problem, could you help me?
Thanks
Gustavo Freitas

Flex Application architecture with web and air interface both using common components.

We have a flex based e-learning application. It uses HTTP REST service and webservice to communicate with ASP.Net application to fetch and store data.
We now want to develop an adobe air version of the user interface, which the students can download on their desktop as well as mobiles (Android, others).
What would be a good architecture for such an application which has both web and windows interface. I can see that we can reuse almost 80% of the code of our web version. But I do not want to copy and create a new windows app from the flex web app. I would want to have both co-exist.
Let me know a good article that I can read on this.

I dug deeper and found the concept of Shared Common Library. I am trying to implement that.

Transaction Locking during multiple Webservice - persistent webs sessions

Hi All, 
 
Yesterday evening we had a discussion concerning ESA architecture. We want to create (web)services for accessing the SAP business objects (using XI) and use these (web)services via visual composer, webdynpro or custom java development. 
 
It does not seem a big problem to perform creations and reads of transaction, but when we want to change objects, we saw some problems concerning locking/commiting and rollbacks. 
 
From our GUI we would like to be able to go in edit mode and from that moment on, the transaction should be locked. We then want to change certain parameters and commit only when we push the save button. 
 
We can invoke a webservice wich tries to lock the transaction, but at the moment the XI scenario is completed (=the lock is created), the program at SAP side (=proxy in our case) is also finished and the lock is automaticly removed. How can we do locking, when using webservices via XI? 
 
The problem of the rollback and commit we can partially solve by putting more logic in the GUI, but we don't want to do that. How can we do a change of a business object and remember this change without doing a commit on the SAP system.... . Same problem for the rollback. 
 
Is there a away to keep a session "alive" during multiple webservice calls or to simulate it? Every webservice invokation happens in a different context...isn't it? 
 
 
Just to make it a bit more clear. 
 
Suppose we create 6 service related to the business object bupa (business partner). 
- read 
- change 
- commit 
- rollback 
- lock 
- unlock. 
 
We create a GUI which uses these services. 
 
Step1: we want to see bupa in detail, so the read webservice is called and the retrieved details are shown in the GUI 
Step2: we want to go in edit mode, so the lock webservice is called to lock the bupa. The bupa should stay locked, untill the unlock is called. Here occurs the problem. The webservice lock is called, XI will trigger the proxy on the SAP system. This proxy will lock the bupa. As soon as the proxy-program is completed, the bupa lock will automaticly be removed ... . We want to keep this lock! 
Step3: we change the bupa using the change webservice. Only the user who locked the bupa should be able to change it. 
Problem concerning the locking occurs: standard we don't know who locked the bupa (this is done by the generic RFC user, configured in sm59). Should we pass some kind of GUID towards the proxy and build some additional logic to know which end-user in fact locked it... . Using the userid isn't sufficient, because a user could logon multiple time simultanously. 
 
Another problem is that we want to change the bupa, without having to do a commit yet.De commit should be called only when pushing the save button. When the proxy is ended and we did not do a commit, the changes are lost normally ... . 
 
What we in fact want to do is Simulate the bsp behaviour. 
Step4:We want to perform a save of the things we changed or a reset. This means the commit or rollback webservice is called. 
Step5: We want to unlock the bupa by calling the unlock webservice. 
 
 
Please give me your comments. 
 
Kind regards 
Joris 
 
Note: Transaction Locking during multiple Webservice "sessions".
Message was edited by:
Joris Verberckmoes

There are multiple strategies how to resolve this. They require that the last change time is available in the changed object, and also that the client keeps the value of the change time when it read the data.
1. First one wins
Immediately before posting the changes, the current change time is read from the server. In case it is different from the client buffer, then the client changes are discarted.
Example:
1. Client A reads data
2. Client B reads data
3. Client B changes its buffer
4. Client B checks if server change time has changed (result is no)
5. Client B writes his changes to the server
6. Client A changes its buffer
7. Client A checks if server change time has changed (result is yes)
8. Client A discarts its changes
2. Last one wins
Easy. Client just writes his changes to the server, overwriting any changes that might have occured since it read the data.
Example:
1. Client A reads data
2. Client B reads data
3. Client B changes its buffer
4. Client B writes his changes to the server
5. Client A changes its buffer
6. Client A writes its changes to the server -> changes from client B are lost
3. Everybody wins
Most complicated. In case of concurrent changes, the client is responsible for merging his changes with the changes from other clients and to resolve any conflicts.
Example:
1. Client A reads data
2. Client B reads data
3. Client B changes its buffer
4. Client B checks if server change time has changed (result is no)
5. Client B writes his changes to the server
6. Client A changes its buffer
7. Client A checks if server change time has changed (result is yes)
8. Client A merges its changes with changes from client B
9. Client A writes his changes to the server
"Last one wins" is definitely not water-proof. But even with the other strategies, data can potentially get lost in the short timeframe when the change time is checked and the actual update.
To make it more secure, server support is required. E.g. the client could pass the change time from its read access to the server. The server can then reliably reject the update if the change data has been updated in beetween by another client.

Difference between Webservice and RFC

Dear Experts,
We have an application to implement where the application will be called from other NON SAP technology. We got two solutions one is developing RFC's and calling it from other NON SAP Technology OR developing Webservice. Could any one please suggest us to which way do we need to choose?
Regards,
Gopinath A.

That's more or less up to you. In a nutshell: RFC is a known SAP technology for communication between SAP and (NON) SAP systems (both ways, inbound and outbound). Communication is set up quite easily (check SCN for that, work for Basis Administrator).
From an RFC, you can get to a WebService within a few clicks. RFC is basis of a webservice, which is based on known (internet) standards.
You decide, together with NON-SAP system (can it consume or provide RFC requests, or webservices for that matter) and basis administrators.
You can find a lot of info in SCN on both methods about architecture etc. This should help you decide.

Need help creating creating a webservice as per the documentation

I'm trying to setup a webservice with reliable messaging using the NWDS. I'm trying to follow the example given in http://help.sap.com/saphelp_nw72/helpdata/en/46/741a3dfcfa0eede10000000a155369/content.htm
I'm not familiar with J2EE development, so I don't know what wizard I should follow in the "File"->"New" to create the java class.
It looks partly like an application, because they are referring to the application-j2ee-engine.xml, but parly looks like an EJB because it has some EJB annotations (but does not implement any interface):
@SessionHandlingDT(enableSession=true)
public class MyClassBean {
Here is what I tried - I created a New Enterprise Application Project, and it shows application-j2ee-engine.xml and application.xml in the Navigator view. When I right clicked the project and said "New Module", there is a dialog box "Add Modules" "Select Web- and EJB- Modules" but the list is EMPTY.
Please advice.

Dear Customer,
I believe this is a wrong forum for this question.
I kindly ask you to raise this question at:
Service-Oriented Architecture (SOA) and SAP
Best Regards,
Ervin

How to develop a webservice with SAML on Weblogic 8.1

I will develop some webservices on Weblogic 8.1. On the security part, we will
use SAML. Is there somebody who can tell me how to do it? Do I need third party
product? And where I can find samples?
Thanks.
Jian

I will develop some webservices on Weblogic 8.1. On the security part,
we will use SAML. Is there somebody who can tell me how to do it? Do I
need third party product? And where I can find samples?Currently, we don't offer any support for SAML in WLS -- so you would
have to use a third party product. Depending on how you want to use it,
you may be able to use a third party product to create a handler for your
service or client.
However, if you want to use the handler in the server to set the subject
for the invoke, the handler architecture will prevent you from doing
this -- the API you use to set the user
(weblogic.security.service.SecurityManager.runAs() -- see
http://edocs.bea.com/wls/docs81/javadocs/weblogic/security/service/SecurityManager.html)
cannot be successfully used in handler methods. If you wish to do this,
I'm afraid the only way we have to support this is to use a servlet filter.
-Pete

BPM 11g: JAVA API and Webservice API

Who knows BPM 11g: JAVA API and Webservice API?
Customer want to call BPM 11g between Heterogeneous systems, such .net framework. One way is use webservice API, I think, but where can find it? thank you

When you create a BPM application in 11g, you're actually creating a SOA composite application with a BPMN component in the composite. From within the BPMN editor, you can specify the interface (parameters) of each start node in the process. If you select a start node, look at the implementation tab, you'll see a properties group that lets you define the interface one property at a time, or by selecting an interface from the catalog.
By defining these properties you're also defining the shape of the Web Service interface that will automatically be created in the composite. If you switch to the composite view, you'll see your BPMN process with a wire to it from a Web Service that's generated from the interface defined in the BPMN editor. The naming convention is the BPMN process name with ".service" appended. When you deploy the BPMN process, the web service will also be deployed, since it's also part of the composite. From Enterprise Manager (EM) you can test the service and get the WSDL, which could be used by other applications (e.g. .NET) to start and interact with a process instance.
This is one of the advantages of the 11g architecture. The composite exposes services to consumers/clients. The implementation could have been BPEL, BPMN, a Mediator, Java/EJBs, or any combination working together. To the consumer, it's just a web service.
In case your next question was about security ... you won't see properties about security in the BPMN editor. You use Web Service Manager to apply security or other constraints to the web service endpoint.

How to make Output WebService accessible?

Hello,
another problem arose in our implementation of xMII as a shop floor integration tool. We are building a service oriented architecture and thus want to employ the WebService functionality of xMII. By using the WSDLGen we have built a Client who receives the output from a BLS consisting of a TagQuery, which has an outgoing Link to an outputproperty (marked as such by checkbox) of the Transaction.
If we call the according WebService, the output reads to "null", if it is an XML doument, or to "0" or "0.0" for int and double respectively. Writing the output to a file gives the same result.
The Query has been tested and used for a dynamic page for validation and generates non-zero output. Do you have any useful hint about where I may have missed an error or what is wrong with my approach?
Thanks in advance!
Andreas Gössling

Hi, for all who will have a similar problem to deal with, I want to give actual info on my solution.
The problem with the XPath was my very own fault, luckily, when configuring transactions for our life server I remembered what in the xMII tutorial was said about the Example XML document.
If you define a transaction which runs a query and want to interlink a specific element of the result XML, make sure to respond on the question "Generate Sample XML document?" after specifying the query with "YES". Otherwise xMII can't show you what elements are in the results document and you will have to give the XPath manually (which is particularly interesting if the queried element contains "/", which is then transformed to "_").
Instead of using the XML resultset and transforming it into an appropriate XML document, I now query several values and assign them each to a single primitive (integer and datetime) output property. I had to give the DateTime values distinctive names in order to not confuse them, but I now can call my Transaction from my Java application and can read all the values separately.
I hope this can be a bit helpful for others who have to deal with similar challenges!
Greetings,
Andreas Gössling

Webservices Architectures

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