"Unable to create web dynpro callable object implementation" - GP error

Good day.
I've created a GP process and transported it to the test system. But when I try to start the process I get an error on the screen: Error while processing the item; it cannot be displayed. When I look to the logs I can see the following exception:
Unable to create web dynpro callable object implementation.
java.lang.Exception
at com.sap.caf.eu.gp.ui.co.exec.wd.COExecWD.execute(COExecWD.java:294)
at com.sap.caf.eu.gp.ui.co.exec.wd.wdp.InternalCOExecWD.execute(InternalCOExecWD.java:171)
at com.sap.caf.eu.gp.ui.co.exec.wd.COExecWDInterface.execute(COExecWDInterface.java:122)
at com.sap.caf.eu.gp.ui.co.exec.wd.wdp.InternalCOExecWDInterface.execute(InternalCOExecWDInterface.java:134)
at com.sap.caf.eu.gp.ui.co.exec.wd.wdp.InternalCOExecWDInterface$External.execute(InternalCOExecWDInterface.java:249)
at com.sap.caf.eu.gp.ui.act.container.VContainer.onPlugFromDispatcher(VContainer.java:391)
at com.sap.caf.eu.gp.ui.act.container.wdp.InternalVContainer.wdInvokeEventHandler(InternalVContainer.java:167)
at com.sap.tc.webdynpro.progmodel.generation.DelegatingView.invokeEventHandler(DelegatingView.java:87)
at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.navigate(ClientApplication.java:826)
at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.navigate(ClientComponent.java:881)
at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.doNavigation(WindowPhaseModel.java:498)
at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequest(WindowPhaseModel.java:144)
at com.sap.tc.webdynpro.clientserver.window.WebDynproWindow.processRequest(WebDynproWindow.java:335)
at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:143)
at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doProcessing(ApplicationSession.java:321)
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessingPortal(ClientSession.java:733)
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessing(ClientSession.java:668)
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doProcessing(ClientSession.java:250)
at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:149)
at com.sap.tc.webdynpro.clientserver.session.core.ApplicationHandle.doProcessing(ApplicationHandle.java:73)
at com.sap.tc.webdynpro.portal.pb.impl.AbstractApplicationProxy.sendDataAndProcessActionInternal(AbstractApplicationProxy.java:860)
at com.sap.tc.webdynpro.portal.pb.impl.AbstractApplicationProxy.create(AbstractApplicationProxy.java:220)
at com.sap.portal.pb.PageBuilder.updateApplications(PageBuilder.java:1289)
at com.sap.portal.pb.PageBuilder.createPage(PageBuilder.java:356)
at com.sap.portal.pb.PageBuilder.init(PageBuilder.java:549)
at com.sap.portal.pb.PageBuilder.wdDoApplicationStateChange(PageBuilder.java:303)
at com.sap.portal.pb.wdp.InternalPageBuilder.wdDoApplicationStateChange(InternalPageBuilder.java:197)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.sap.tc.webdynpro.progmodel.generation.DelegatingComponent.doApplicationStateChange(DelegatingComponent.java:139)
at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.doApplicationStateChange(ClientComponent.java:667)
at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.doApplicationStateChange(ClientApplication.java:537)
at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:120)
at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doProcessing(ApplicationSession.java:321)
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessingStandalone(ClientSession.java:713)
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessing(ClientSession.java:666)
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doProcessing(ClientSession.java:250)
at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:149)
at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:62)
at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doPost(DispatcherServlet.java:53)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:386)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:364)
at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:1039)
at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:265)
at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)
at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:175)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
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:104)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:176)
It doesn't make any sense to me... I would appreciate for any help.

Hello
We are facing exact similar issue when we checked the logs.
Could you help us as we are new to GP.
What steps you followed to resolve this error.
Regards
aparna

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With reference to thread:
Interactive form as Callable object error on testing the object.
FYI, I'm running NW04s, EP 7.0 SPS 13, JDK 1.4.2_14, Unix OS
Hi All,
I have created a Web Dynpro App with a Adobe Form as the frontend. I have included the caf/eu/gp/api as a DC and implemented the IGPWebDynproCO interface. Next I created a Web Dynpro Callable object in GP and ran a test and received the following error:
Result: Technical Exception
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Output Parameters
Callable object implementation did not return output parameters
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Hi,
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Hi,
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Hi all,
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Hi Ritu ,
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Hi,
I have to use a MessageArea UI element in a view of a web Dynpro callable object,
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Your callable object do have a webdynpro view with a message area as well?
From my understanding when there is 2 view display at once, only 1 message area is required, if both view are having message area, the message will not display.
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Edited by: V. Kong on Nov 7, 2008 1:43 PM

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Hi All,
I'm getting the following error:
"Cannot read callable object description from component"
and also "Cannot read callable object description from component" in two different Web Dynpros.
The code in the Web Dynpros is similar:
try
 IWDTextAccessor textAccessor = wdComponentAPI.getTextAccessor();
 WebDynproResourceAccessor resourceAccessor = new WebDynproResourceAccessor(textAccessor);
 //ITechnicalDescription techDesc = TechnicalDescriptionFactory.newTechnicalDescription("FRESH_PARAMS","Fresh_Parameters To Be Called",resourceAccessor,locale);
 ITechnicalDescription techDesc = TechnicalDescriptionFactory.newTechnicalDescription("FRESH_PARAMS","Fresh",resourceAccessor,locale);
 //Pre-Existing Structure for Input
 IStructureInfo input = techDesc.getInputStructureInfo();
 IAttributeInfo firstName = input.addAttribute("firstName",IAttributeInfo.BASE_STRING);
 IAttributeInfo lastName = input.addAttribute("lastName",IAttributeInfo.BASE_STRING);
 IAttributeInfo phoneNum = input.addAttribute("phoneNum",IAttributeInfo.BASE_STRING);
 IAttributeInfo Place = input.addAttribute("Place",IAttributeInfo.BASE_STRING);
 IAttributeInfo Email = input.addAttribute("Email",IAttributeInfo.BASE_STRING);
 IAttributeInfo Company = input.addAttribute("Company",IAttributeInfo.BASE_STRING);
 //Setting multiplicity
 firstName.setMultiplicity(IAttributeInfo.MULITIPLICITY_1_1);
 lastName.setMultiplicity(IAttributeInfo.MULITIPLICITY_1_1);
 phoneNum.setMultiplicity(IAttributeInfo.MULITIPLICITY_1_1);
 Place.setMultiplicity(IAttributeInfo.MULITIPLICITY_1_1);
 Email.setMultiplicity(IAttributeInfo.MULITIPLICITY_1_1);
 Company.setMultiplicity(IAttributeInfo.MULITIPLICITY_1_1);
 //Pre-Existing Structure for Output
 IStructureInfo output = techDesc.getOutputStructureInfo();
 IStructureInfo userStruct1 = output.addStructure("userStruct1");
 userStruct1.addAttribute("firstName",IAttributeInfo.BASE_STRING);
 userStruct1.addAttribute("lastName",IAttributeInfo.BASE_STRING);
 IStructureInfo userStruct2 = output.addStructure("userStruct2");
 userStruct2.addAttribute("phoneNum",IAttributeInfo.BASE_STRING);
 userStruct2.addAttribute("Place",IAttributeInfo.BASE_STRING);
 userStruct2.addAttribute("Email",IAttributeInfo.BASE_STRING);
 userStruct2.addAttribute("Company",IAttributeInfo.BASE_STRING);
 return techDesc;
 catch (InvocationException ex)
 ex.printStackTrace();
 return null;
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Hi Zornista Yankulova
I'm getting this error:
" Cannot read callable object description from component: Failed to create delegate for custom controller com.infosys.creator.wdpco.COGetDocTypeInterface. (Hint: Is the corresponding DC deployed correctly? Does the DC contain the component?)"
Where the places i can go wrong??
Please let me know.
My code is like this?
public com.sap.caf.eu.gp.co.api.ITechnicalDescription getDescription( java.util.Locale locale )
 //@@begin getDescription()
 try
 IWDTextAccessor textAccessor = wdComponentAPI.getTextAccessor();
 WebDynproResourceAccessor resourceAccessor = new WebDynproResourceAccessor(textAccessor);
 //ITechnicalDescription techDesc = TechnicalDescriptionFactory.newTechnicalDescription("FRESH_PARAMS","Fresh_Parameters To Be Called",resourceAccessor,locale);
 ITechnicalDescription techDesc = TechnicalDescriptionFactory.newTechnicalDescription("FRESH_PARAMS","Fresh",resourceAccessor,locale);
 //Pre-Existing Structure for Input
 IStructureInfo input = techDesc.getInputStructureInfo();
 IAttributeInfo firstName = input.addAttribute("firstName",IAttributeInfo.BASE_STRING);
 IAttributeInfo lastName = input.addAttribute("lastName",IAttributeInfo.BASE_STRING);
 IAttributeInfo phoneNum = input.addAttribute("phoneNum",IAttributeInfo.BASE_STRING);
 IAttributeInfo Place = input.addAttribute("Place",IAttributeInfo.BASE_STRING);
 IAttributeInfo Email = input.addAttribute("Email",IAttributeInfo.BASE_STRING);
 IAttributeInfo Company = input.addAttribute("Company",IAttributeInfo.BASE_STRING);
 //Setting multiplicity
 firstName.setMultiplicity(IAttributeInfo.MULITIPLICITY_1_1);
 lastName.setMultiplicity(IAttributeInfo.MULITIPLICITY_1_1);
 phoneNum.setMultiplicity(IAttributeInfo.MULITIPLICITY_1_1);
 Place.setMultiplicity(IAttributeInfo.MULITIPLICITY_1_1);
 Email.setMultiplicity(IAttributeInfo.MULITIPLICITY_1_1);
 Company.setMultiplicity(IAttributeInfo.MULITIPLICITY_1_1);
 //Pre-Existing Structure for Output
 IStructureInfo output = techDesc.getOutputStructureInfo();
 IStructureInfo userStruct1 = output.addStructure("userStruct1");
 userStruct1.addAttribute("firstName",IAttributeInfo.BASE_STRING);
 userStruct1.addAttribute("lastName",IAttributeInfo.BASE_STRING);
 IStructureInfo userStruct2 = output.addStructure("userStruct2");
 userStruct2.addAttribute("phoneNum",IAttributeInfo.BASE_STRING);
 userStruct2.addAttribute("Place",IAttributeInfo.BASE_STRING);
 userStruct2.addAttribute("Email",IAttributeInfo.BASE_STRING);
 userStruct2.addAttribute("Company",IAttributeInfo.BASE_STRING);
 return techDesc;
 catch (InvocationException ex)
 ex.printStackTrace();
 return null;
 //@@end
//@@begin javadoc:execute()
/** Declared method. */
//@@end
public void execute( com.sap.caf.eu.gp.co.api.IExecutionContext executionContext )
 //@@begin execute()
 try
 IWDTextAccessor textAccessor = wdComponentAPI.getTextAccessor();
 WebDynproResourceAccessor resourceAccessor = new WebDynproResourceAccessor(textAccessor);
 this.executionContext = executionContext;
 //Input
 IStructure input = executionContext.getInputStructure();
 String firstName = (String)input.getAttribute("firstName");
 String lastName = (String)input.getAttribute("lastName");
 String phoneNum = (String)input.getAttribute("phoneNum");
 String Email= (String)input.getAttribute("Email");
 String Place = (String)input.getAttribute("Place");
 String Company = (String)input.getAttribute("Company");
 wdContext.nodeInput().currentInputElement().setFirstName(firstName);
 wdContext.nodeInput().currentInputElement().setLastName(lastName);
 wdContext.nodeInput().currentInputElement().setPhoneNum(phoneNum);
 wdContext.nodeInput().currentInputElement().setEmail(Email);
 wdContext.nodeInput().currentInputElement().setPlace(Place);
 wdContext.nodeInput().currentInputElement().setCompany(Company);
 //Output
 IStructure output = executionContext.getOutputStructure();
 String f = wdContext.nodeInput().currentInputElement().getFirstName();
 String l = wdContext.nodeInput().currentInputElement().getLastName();
 String pn = wdContext.nodeInput().currentInputElement().getPhoneNum();
 String e = wdContext.nodeInput().currentInputElement().getEmail();
 String p = wdContext.nodeInput().currentInputElement().getPlace();
 String c = wdContext.nodeInput().currentInputElement().getCompany();
 output.setAttributeValue("firstName",f);
 output.setAttributeValue("lastName",l);
 output.setAttributeValue("phoneNum",pn);
 output.setAttributeValue("Email",e);
 output.setAttributeValue("Place",p);
 output.setAttributeValue("Company",c);
 catch(Exception ex)
 ex.printStackTrace();
 //@@end
//@@begin javadoc:complete()
/** Declared method. */
//@@end
public void complete( )
 //@@begin complete()
 try
 IWDTextAccessor textAccessor = wdComponentAPI.getTextAccessor();
 WebDynproResourceAccessor resourceAccessor = new WebDynproResourceAccessor(textAccessor);
 IStructure output = executionContext.getOutputStructure();
 IStructure user1 = output.addStructure("userStruct1");
 IStructure user2 = output.addStructure("userStruct2");
 String f = wdContext.nodeInput().currentInputElement().getFirstName();
 String l = wdContext.nodeInput().currentInputElement().getLastName();
 String pn = wdContext.nodeInput().currentInputElement().getPhoneNum();
 String e = wdContext.nodeInput().currentInputElement().getEmail();
 String p = wdContext.nodeInput().currentInputElement().getPlace();
 String c = wdContext.nodeInput().currentInputElement().getCompany();
 user1.setAttributeValue("firstName",f);
 user1.setAttributeValue("lastName",l);
 user2.setAttributeValue("phoneNum",pn);
 user2.setAttributeValue("Email",e);
 user2.setAttributeValue("Place",p);
 user2.setAttributeValue("Company",c);
 executionContext.addResultState("Success");
 executionContext.processingComplete();
 catch(InvocationException e)
 e.printStackTrace();
 catch(EngineException ex)
 ex.printStackTrace();
 //@@end
 * The following code section can be used for any Java code that is
 * not to be visible to other controllers/views or that contains constructs
 * currently not supported directly by Web Dynpro (such as inner classes or
 * member variables etc.). 
 * Note: The content of this section is in no way managed/controlled
 * by the Web Dynpro Designtime or the Web Dynpro Runtime.
//@@begin others
private IExecutionContext executionContext;
//@@end
Thanks
Srikant

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Reusability of web dynpro callable object

Hi,
I want to use same webdynpro callable object inside another callable object including some extra input and output parameter.
So that I dont have to write the same code again in another callable object.
is it possible?

Hi Ritu ,
Yes ofcourse we can use the same Callable object in another CO.
I dont think below mentioned is the better way to do .
while setting the input parameters and output parameters in the description method and execute method use if condition based on the status.
follow the same procedure in the description and execute method.
if (Status =="some value"){
set the Extra input parameters.
//below dont use else
normal input parameters for the callable object.
in the same way do it for the output parameters.
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for eg :
an employee open a leave form , here the status will be new.
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I am trying out the tutorial for implementing Web Dynpro Callable object.
I think i have missed to add some library.
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Also mention what other library i need to import for this.
WebDynproResourceAccessor resourceAccessor = new WebDynproResourceAccessor(textAccessor);
StructureInfo input = techDesc.getInputStructureInfo();
Regards
Satya

Hi Satya,
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caf/eu/gp/api
caf/eu/gp/api/wd
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    at javax.xml.stream.FactoryLocator.loadFactory(FactoryLocator.java:120)
    at javax.xml.stream.FactoryLocator.locate(FactoryLocator.java:109)
    at javax.xml.stream.FactoryLocator.locate(FactoryLocator.java:54)
    at javax.xml.stream.XMLInputFactory.newInstance(XMLInputFactory.java:41)
    at org.apache.axiom.om.util.StAXUtils$7.run(StAXUtils.java:311)*
Also while running the GP processses which are created in the past and working fine till few days back are also giving the same above error.
Please help us in resolving the issue.
Regards,
Satish

Hi Peter,
Check this link.It may be helpful.
https://www.sdn.sap.com/irj/scn/wiki?path=/display/java/netweaver%252bdeveloper%252bstudio%252b(NWDS)
Regards,
Sumangala

Error when Creating Web Dynpro Model in CAF-Service

Hi All,
I reaaly need help. AFter updating to SPS 9, it was necessary to redeploy my Entity Service. That contains to "Create a Web Dynpro Model" in the Service Explorer,
to get an interface of the Service in my Web Dynpro Application.
Before I update to SPS 9, the Application works fine.
But now, when I want to "Create a Web Dynpro Model" in the NWDS I get the following Error-Message (its not a useful Error-Message):
Error cannot create Web Dynpro Model:
Creation of Web Dynpro model failed. Reason: null 
Thanks for helping me
Steve

Hi Aliaksei,
the problem in the thread is the same I got.
When I use only 7 letters for the operation name, the creation work. When I use more then 7 letters the creation doesnt work.
But its hard to find a methodname with only 7 letters.
In SPS 8 I didnt have problems with the length of method names. Why is it so?
The workspace log:
!ENTRY com.tssap.util 4 0 Okt 10, 2006 15:12:45.577
!MESSAGE Oct 10, 2006 3:12:45 PM com.sap.ip.mmr.foundation.AssociationsOfObject [Thread[main,5,main]] Error: com.sap.engine.lib.xml.parser.NestedSAXParserException: Fatal Error: com.sap.engine.lib.xml.parser.ParserException: XMLParser: No data allowed here: (hex) 35, 3c, 3f(:main:, row:1, col:3)(:main:, row=1, col=3) -> com.sap.engine.lib.xml.parser.ParserException: XMLParser: No data allowed here: (hex) 35, 3c, 3f(:main:, row:1, col:3)
!ENTRY com.tssap.util 4 0 Okt 10, 2006 15:12:45.592
!MESSAGE Oct 10, 2006 3:12:45 PM com.sap.ip.mmr.foundation.AssociationsOfObject [Thread[main,5,main]] Error: com.sap.engine.lib.xml.parser.NestedSAXParserException: Fatal Error: com.sap.engine.lib.xml.parser.ParserException: XMLParser: No data allowed here: (hex) 35, 3c, 3f(:main:, row:1, col:3)(:main:, row=1, col=3) -> com.sap.engine.lib.xml.parser.ParserException: XMLParser: No data allowed here: (hex) 35, 3c, 3f(:main:, row:1, col:3)
!ENTRY com.tssap.util 4 0 Okt 10, 2006 15:12:48.705
!MESSAGE Oct 10, 2006 3:12:48 PM com.sap.ide.metamodel.core.service.FileSystemService.comp... [Thread[main,5,main]] Error: absolute path too long (253) for MDO:
!ENTRY com.tssap.util 4 0 Okt 10, 2006 15:12:48.705
!MESSAGE Oct 10, 2006 3:12:48 PM com.sap.ide.metamodel.core.service.FileSystemService.comp... [Thread[main,5,main]] Error: absolute path too long (253) for MDO:
!ENTRY com.tssap.util 4 0 Okt 10, 2006 15:12:48.705
!MESSAGE Oct 10, 2006 3:12:48 PM com.sap.ide.metamodel.webdynpro.implementation.ModelProxy... [Thread[main,5,main]] Error: could not get a valid path for ModelClass "cas.conti.com.sap.cd.database.services.cd_database.changedescriptiontableservice.QChangeDescriptionTableServiceFindByTitle" (path too long?)
!ENTRY com.tssap.util 4 0 Okt 10, 2006 15:12:48.705
!MESSAGE Oct 10, 2006 3:12:48 PM com.sap.ide.metamodel.webdynpro.implementation.ModelProxy... [Thread[main,5,main]] Error: could not get a valid path for ModelClass "cas.conti.com.sap.cd.database.services.cd_database.changedescriptiontableservice.QChangeDescriptionTableServiceFindByTitle" (path too long?)
Thanks
Steve

GP Interactive form Callable object implementation

Hello experts,
I am trying to use a adobe interactive form as a callable object in guided procedure and when I do the testing the error I am getting is:
"Callable object implementation did not return output parameters"
Result: Technical exception
Details: Service call exception; nested exception is:
java.net.UnknownHostException: pwdf3102: Service call exception; nested exception is:
java.net.UnknownHostException: pwdf3102: Service call exception; nested exception is:
java.net.UnknownHostException: pwdf3102
I did check all the configuration setting and everything seems to be all right.
Appreciate any suggestions.
Muthu Sundarresan.

I myself fixed it by creating an entry in the hosts file. Location: C:\WINDOWS\system32\drivers\etc\hosts.
Muthu

"Unable to create web dynpro callable object implementation" - GP error

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