Can't create model in Web Dynpro

Question

Hi all,
I want to create a model in a web dynpro  project.
When i click the "models" --> "Create Model" in the , it appear below error.
===================================================
Internal error
Plugin name :Web Dynpro Model Editor
Plugin ID  : com.sap.ide.webdynpro.modeleditor
Class : com.sap.ide.webdynpro.modeleditor.ModelEditorCallback
Method : createModel
Exception : java.lang.NullPointerException: null
===================================================
In the log file :
======================================================
com.sap.ide.webdynpro.ui.service.ServicesUI          [Thread[main,5,main]] Error: Internal error
   Plugin name: Web Dynpro Model Editor
   Plugin ID  : com.sap.ide.webdynpro.modeleditor
   Class      : com.sap.ide.webdynpro.modeleditor.ModelEditorCallback
   Method     : createModel
   Message    : An error ocurred. See error log for more details.
   Exception  : java.lang.NullPointerException: null
!STACK 0
java.lang.NullPointerException
     at com.sap.ide.jcb.core.service.SAPLogonHelper.<init>(SAPLogonHelper.java:48)
     at com.sap.ide.jcb.core.wizardpages.SAPLogonPage$MessageServerPane.fillUpLoadBalancingPaneSystems(SAPLogonPage.java:1003)
     at com.sap.ide.jcb.core.wizardpages.SAPLogonPage$MessageServerPane.show(SAPLogonPage.java:303)
     at com.sap.ide.jcb.core.wizardpages.SAPLogonPage.createControl(SAPLogonPage.java:91)
     at com.sap.ide.webdynpro.modeleditor.wizards.model.creation.ModelWizard.createPageControls(ModelWizard.java:408)
     at org.eclipse.jface.wizard.WizardDialog.createPageControls(WizardDialog.java:524)
     at org.eclipse.jface.wizard.WizardDialog.createContents(WizardDialog.java:473)
     at org.eclipse.jface.window.Window.create(Window.java:302)
     at org.eclipse.jface.window.Window.open(Window.java:552)
     at com.sap.ide.webdynpro.modeleditor.ModelEditorCallback.createModel(ModelEditorCallback.java:52)
     at com.sap.ide.webdynpro.service.modeleditor.ModelService.createModelWithUI(ModelService.java:70)
     at com.sap.ide.webdynpro.service.modeleditor.ServiceWithUI.createModel(ServiceWithUI.java:49)
     at com.sap.ide.webdynpro.tsmodel.application.provider.ModelNodeProvider.createUniqueName(ModelNodeProvider.java:55)
     at com.tssap.selena.impl.model.elements.EntityImpl.createChildEntityUin(EntityImpl.java:936)
     at com.tssap.selena.impl.model.elements.EntityImpl.createChildEntity(EntityImpl.java:502)
     at com.sap.ide.webdynpro.tsmodel.application.actions.CreationAction.runInternal(CreationAction.java:76)
     at com.sap.ide.webdynpro.tsmodel.application.actions.CreationAction.access$000(CreationAction.java:24)
     at com.sap.ide.webdynpro.tsmodel.application.actions.CreationAction$1.run(CreationAction.java:51)
     at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1595)
     at com.sap.ide.webdynpro.tsmodel.application.actions.CreationAction.run(CreationAction.java:57)
     at com.sap.ide.webdynpro.projectbrowser.actions.PBCreateModelAction.run(PBCreateModelAction.java:95)
     at com.tssap.selena.model.extension.action.SelenaActionCollector$GenericElementActionWrapper.run(SelenaActionCollector.java:224)
     at com.tssap.util.ui.menu.MenuFactory$MuSiAction.saveRunAction(MenuFactory.java:1425)
     at com.tssap.util.ui.menu.MenuFactory$MuSiAction.run(MenuFactory.java:1407)
     at com.tssap.util.ui.menu.MenuFactory$DelegateAction.processInternal(MenuFactory.java:616)
     at com.tssap.util.ui.menu.MenuFactory$DelegateAction.access$100(MenuFactory.java:586)
     at com.tssap.util.ui.menu.MenuFactory$DelegateAction$BusyProcessWorker.run(MenuFactory.java:716)
     at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:69)
     at com.tssap.util.ui.menu.MenuFactory$DelegateAction.process(MenuFactory.java:610)
     at com.tssap.util.ui.menu.internal.MenuListenerFactory$ProcessAdapter.widgetSelected(MenuListenerFactory.java:172)
     at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:89)
     at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:81)
     at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:840)
     at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2022)
     at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:1729)
     at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1402)
     at org.eclipse.ui.internal.Workbench.run(Workbench.java:1385)
     at com.tssap.util.startup.WBLauncher.run(WBLauncher.java:79)
     at org.eclipse.core.internal.boot.InternalBootLoader.run(InternalBootLoader.java:858)
     at org.eclipse.core.boot.BootLoader.run(BootLoader.java:461)
     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.ide.eclipse.startup.Main.basicRun(Main.java:291)
     at com.sap.ide.eclipse.startup.Main.run(Main.java:789)
     at com.sap.ide.eclipse.startup.Main.main(Main.java:607)
=============================================================
NWDS
Version: 7.0.13
Build id: 200708072056
OS
Window Vista Home Basic 32bit
Could anyone help me?
Regards.
Wenjr
Message was edited by:
        wenjr wu

Answer 1

I encountered the same issue in all NWDS versions I tested on Windows Vista, while it works perfectly fine on Windows XP.
This issue is caused by com.sap.ide.jcb.core.service.SAPLogonHelper not being able to retrieve system environment variables on Windows Vista.
Fortunately the solution is simple: let NWDS think that it is running on Windows XP instead of Windows Vista. This can be achieved by adding the following parameter to "vm.parameters" in the NWDS installation directory (probably C:\Program Files\SAP\IDE\IDE70\eclipse):
-Dos.name='Windows XP'
(don't forget the single qoutes)
So your vm.parameters should look something like:
-Xmx1024m
-Xms256m
-XX:PermSize=32m
-XX:MaxPermSize=128m
-Dos.name='Windows XP'
Regards,
Hans de Boer
Edited by: Hans de Boer on Jun 25, 2008 1:17 PM