Prob in displaying the dynamically created ui elements on click of a button

hi all
i created 1 inputfield, 2 buttons & i wrote the following code in wddomodifyview() of view.
IWDInputField inf1=(IWDInputField)view.createElement(IWDInputField.class,"inf1");
    inf1.bindValue("Student.name");
    IWDButton but1=(IWDButton)view.createElement(IWDButton.class,"button1");
    but1.setText("Button1");
    IWDButton but2=(IWDButton)view.createElement(IWDButton.class,"button2");
    but2.setText("Button2");
    IWDTransparentContainer tc=(IWDTransparentContainer)view.getElement("TransparentContainer");
     tc.addChild(inf1);
    tc.addChild(but1);
    tc.addChild(but2);
     IWDButton button1= (IWDButton) view.getElement("button1");
     IWDAction theAction=wdThis.wdCreateAction(IPrivateDynCompView.WDActionEventHandler.DISPLAY,"");
                    but1.setOnAction(theAction);
                         IWDParameterMapping bm1 = button1.mappingOfOnAction();
                         bm1.addParameter("id", "b1");
               IWDButton button2= (IWDButton) view.getElement("button2");
               IWDParameterMapping bm2 = button1.mappingOfOnAction();
               bm1.addParameter("id", "b2");
and i wrote the following code in onactiondisplay()
if (id.equals("b1"))
     wdContext.currentStudentElement().setName("First Button Clicked");
     else
     wdContext.currentStudentElement().setName("Second Button Clicked");
when i run the application, the following error is displaying.....
The initial exception that caused the request to fail, was:
   com.sap.tc.webdynpro.services.exceptions.WDRuntimeException: View: Cannot add element with duplicate ID "inf1" of type com.sap.tc.webdynpro.clientserver.uielib.standard.impl.InputField
    at com.sap.tc.webdynpro.progmodel.view.View.addElement(View.java:481)
    at com.sap.tc.webdynpro.progmodel.view.ViewElement.<init>(ViewElement.java:43)
    at com.sap.tc.webdynpro.progmodel.view.UIElement.<init>(UIElement.java:188)
    at com.sap.tc.webdynpro.clientserver.uielib.standard.impl.AbstractInputField.<init>(AbstractInputField.java:143)
    at com.sap.tc.webdynpro.clientserver.uielib.standard.impl.InputField.<init>(InputField.java:71)
    ... 35 more
com.sap.tc.webdynpro.services.exceptions.WDCreationFailedException: Cannot create view element implementation com.sap.tc.webdynpro.clientserver.uielib.standard.impl.InputField
     at com.sap.tc.webdynpro.progmodel.view.ViewElementFactory.createElement(ViewElementFactory.java:75)
     at com.sap.tc.webdynpro.progmodel.view.View.createElement(View.java:89)
     at com.sap.dynactions.DynCompView.wdDoModifyView(DynCompView.java:140)
     at com.sap.dynactions.wdp.InternalDynCompView.wdDoModifyView(InternalDynCompView.java:240)
     at com.sap.tc.webdynpro.progmodel.generation.DelegatingView.doModifyView(DelegatingView.java:78)
     at com.sap.tc.webdynpro.progmodel.view.View.modifyView(View.java:190)
     at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.doModifyView(ClientComponent.java:398)
     at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.modifyView(ClientApplication.java:679)
     at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.handleActionEvent(WebDynproMainTask.java:381)
     at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.execute(WebDynproMainTask.java:649)
     at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:59)
     at com.sap.tc.webdynpro.clientserver.cal.ClientManager.doProcessing(ClientManager.java:248)
     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.doPost(DispatcherServlet.java:55)
     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:390)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:264)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:347)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:325)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:887)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:241)
     at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)
     at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:148)
     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:95)
     at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:160)
Caused by: java.lang.reflect.InvocationTargetException
     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
     at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
     at com.sap.tc.webdynpro.progmodel.view.ViewElementFactory.createElement(ViewElementFactory.java:65)
     ... 30 more
Caused by: com.sap.tc.webdynpro.services.exceptions.WDRuntimeException: View: Cannot add element with duplicate ID "inf1" of type com.sap.tc.webdynpro.clientserver.uielib.standard.impl.InputField
     at com.sap.tc.webdynpro.progmodel.view.View.addElement(View.java:481)
     at com.sap.tc.webdynpro.progmodel.view.ViewElement.<init>(ViewElement.java:43)
     at com.sap.tc.webdynpro.progmodel.view.UIElement.<init>(UIElement.java:188)
     at com.sap.tc.webdynpro.clientserver.uielib.standard.impl.AbstractInputField.<init>(AbstractInputField.java:143)
     at com.sap.tc.webdynpro.clientserver.uielib.standard.impl.InputField.<init>(InputField.java:71)
     ... 35 more
pls tell me how to run this application without errors.....
thanks & regards,
vila.

Hi Vila,
Issue here is you are trying to create Input field with already used id "inf1" in first line of code
IWDInputField inf1=(IWDInputField)view.createElement(IWDInputField.class,"inf1");
Please change it to
IWDInputField inf1=(IWDInputField)view.createElement(IWDInputField.class,"inf2");
and correspondingly line
tc.addChild(inf2);
Your code will work.
Please note that you should follow....following code style in wdDoModifyview
if(firstTime)
//dynamic view elements creation

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          <jar href="resources/JNLPTime.jar"/>
     </resources>
<application-desc main-class="J2.ws.TheTime"/>
</jnlp>
How can I make the server invoke the JNLP as opposed to serving it back?
Your suggestions are very much appreciated.
thank you - Minnie

Hi! I am doing a similar project where I have a jsp
that calls the jnlp using this url:
http://c37ts014/myserver/server/servlet/WebStartUpload.
nlp?documentid=123&documentname=test
How can I get the values of my parameters namely
documentid and documentname inside my app? Is there a
way where I need not have to create my jnlp
dynamically then? If not, would it be ok to ask how
you did your dynamic loading through jsp?
Hope you can help me. Thanks.I experimented with this heavily yesterday (using oracle app server , but it is the same idea) and could not get it to work with parameters on both the jnlp and jar resource hrefs, however it can work with parameters on the homepage href. Too bad, there seems to be no reason why it shouldn't work with parameters in all situations unless it has some security implication that I'm not aware of.

Prob in displaying the dynamically created ui elements on click of a button

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