Compilation error in using JNA example

[Sushant]

I am using JNA 3.4.0, to create an RCP application using JNA concepts.
I tried to implement what seems to be a very simple tutorial given
<http://en.wikipedia.org/wiki/Java_Native_Access> ,

But every time I execute, I get following error.
I have imported the jar to my eclipse Referenced Libraries, and have
set the jna.library.path to C:/Windows/System32 (Windows 7)

Where else I could be wrong? Can someone recommend something please.

java.lang.ClassNotFoundException: com.sun.jna.win32.StdCallLibrary
at
org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:
513)
at
org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:
429)
at
org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:
417)
at
org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:
107)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at
org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:
188)
at
org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:
601)
at
org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:
567)
at
org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:
490)
at
org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass_LockClassName(ClasspathManager.java:
469)
at
org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:
456)
at
org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:
216)
at
org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:
400)
at
org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:
476)
at
org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:
429)
at
org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:
417)
at
org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:
107)
at java.lang.ClassLoader.loadClass(Unknown Source)
at com.mando.tools.downloader.actions.HelloWorld.Run(HelloWorld.java:
14)
at com.mando.tools.downloader.view.View.createPartControl(View.java:
91)
at
org.eclipse.ui.internal.ViewReference.createPartHelper(ViewReference.java:
375)
at
org.eclipse.ui.internal.ViewReference.createPart(ViewReference.java:
229)
at
org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:
595)
at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:313)
at org.eclipse.ui.internal.ViewPane.setVisible(ViewPane.java:534)
at
org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:
180)
at
org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:
270)
at
org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:
65)
at
org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:
473)
at
org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:
1245)
at org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:
1198)
at org.eclipse.ui.internal.PartStack.showPart(PartStack.java:1597)
at org.eclipse.ui.internal.PartStack.createControl(PartStack.java:
643)
at org.eclipse.ui.internal.PartStack.createControl(PartStack.java:
570)
at
org.eclipse.ui.internal.PartSashContainer.createControl(PartSashContainer.java:
568)
at
org.eclipse.ui.internal.PerspectiveHelper.activate(PerspectiveHelper.java:
272)
at org.eclipse.ui.internal.Perspective.onActivate(Perspective.java:
981)
at
org.eclipse.ui.internal.WorkbenchPage.onActivate(WorkbenchPage.java:
2714)
at org.eclipse.ui.internal.WorkbenchWindow
$27.run(WorkbenchWindow.java:3023)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:
70)
at
org.eclipse.ui.internal.WorkbenchWindow.setActivePage(WorkbenchWindow.java:
3004)
at
org.eclipse.ui.internal.WorkbenchWindow.busyOpenPage(WorkbenchWindow.java:
799)
at org.eclipse.ui.internal.Workbench
$23.runWithException(Workbench.java:1224)
at org.eclipse.ui.internal.StartupThreading
$StartupRunnable.run(StartupThreading.java:31)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at
org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:
135)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:
4140)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3757)
at
org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:
803)
at org.eclipse.ui.internal.Workbench
$33.runWithException(Workbench.java:1595)
at org.eclipse.ui.internal.StartupThreading
$StartupRunnable.run(StartupThreading.java:31)
at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:
180)
at
org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:
150)
at org.eclipse.swt.widgets.Display.syncExec(Display.java:4683)
at
org.eclipse.ui.internal.StartupThreading.runWithoutExceptions(StartupThreading.java:
94)
at org.eclipse.ui.internal.Workbench.init(Workbench.java:1590)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2623)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674)
at
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:
332)
at
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:
667)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:
149)
at
com.mando.tools.downloader.controller.Application.start(Application.java:
20)
at
org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:
196)
at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:
110)
at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:
79)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:
344)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:
179)
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.equinox.launcher.Main.invokeFramework(Main.java:622)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
at org.eclipse.equinox.launcher.Main.main(Main.java:1386)