Exception Occured!! java.lang.NoClassDefFoundError: org/apache/xerces/dom3/bootstrap/DOMImplementati   

I've installed Semantic Tools for Web Services with the following five files:

eclipse-SDK-3.1RC4-win32.zip
wtp-sdk-1.0M8.zip
emf-sdo-xsd-SDK-I200506230200.zip
GEF-SDK-3.1M6.zip
JEM-SDK-I20050715.zip

After download and installation, I followed the installation instructions to launch Eclipse with the argument as below:

D:\eclipse\eclipse.exe -vmargs -Djava.endorsed.dirs="D:\eclipse\plugins\org.apache.xerces_2.7.0\jars"

(Because there is a subdirectory called "org.apache.xerces_2.7.0" within wtp-sdk-1.0M8.zip rather than "org.apache.xerces_2.6.2", I changed the command line argument indicated in the installation instructions accordingly.
Btw: I cann't find wtp-sdk-1.0M4.zip anywhere!
)

Then I tried to create a sample project following the document "Semantic Tools for Web Services User Guide>Concepts>Getting Started".

When proceeding to Setp 3
"In the Navigator view, expand all the nodes of the newly created samples project. Right-click "RequestPopulationService.wsdl" and select "Open With > Semantic Annotation Editor"."
The file cannot be displayed in the main window.

How can I solve this Problem?? If you know that, please reply to this article or mail me: chen-yz04@mails.tsinghua.edu.cn
Thanks a lot!!

The error log is as follow:

!ENTRY org.eclipse.ui 4 4 2005-10-21 17:15:42.119
!MESSAGE Unhandled event loop exception

!ENTRY org.eclipse.ui 4 0 2005-10-21 17:15:42.119
!MESSAGE org/apache/xerces/dom3/bootstrap/DOMImplementationRegistry
!STACK 0
java.lang.NoClassDefFoundError: org/apache/xerces/dom3/bootstrap/DOMImplementationRegistry
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at com.ibm.creole.semantics.annotations.ui.editor.WsdlAnnotationEditor.init(WsdlAnnotationEditor.java:139)
at org.eclipse.ui.internal.EditorManager.createSite(EditorManager.java:773)
at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:572)
at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:365)
at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:552)
at org.eclipse.ui.internal.PartPane.requestActivation(PartPane.java:239)
at org.eclipse.ui.internal.EditorPane.requestActivation(EditorPane.java:88)
at org.eclipse.ui.internal.presentations.PresentablePart.setFocus(PresentablePart.java:137)
at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation$1.handleEvent(TabbedStackPresentation.java:92)
at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:267)
at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:272)
at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.handleMouseDown(AbstractTabFolder.java:342)
at org.eclipse.ui.internal.presentations.util.AbstractTabFolder$3.mouseDown(AbstractTabFolder.java:79)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:133)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:843)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3080)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2713)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1699)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1663)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:367)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:143)
at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:103)
at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:226)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:376)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:163)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:334)
at org.eclipse.core.launcher.Main.basicRun(Main.java:278)
at org.eclipse.core.launcher.Main.run(Main.java:973)
at org.eclipse.core.launcher.Main.main(Main.java:948)