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Home » Eclipse Projects » Plugin Development Environment (PDE) » java.lang.NoClassDefFoundError: org/eclipse/core/runtime/IPath
java.lang.NoClassDefFoundError: org/eclipse/core/runtime/IPath [message #634505] Fri, 22 October 2010 01:55
Mark Anderson is currently offline Mark AndersonFriend
Messages: 8
Registered: October 2010
Junior Member
Hi all,

While I debugging a new plugin developed in Helios, I got a exception as belows...

java.lang.NoClassDefFoundError: org/eclipse/core/runtime/IPath
Caused by: java.lang.ClassNotFoundException: org.eclipse.core.runtime.IPath

At the first time I got this exception, I double checked Required Plug-ins in Dependencies of Menifest.
So I found org.eclipse.equinox.common was missed in required plugin (this plug in has org.eclipse.core.runtime.IPath) and added to required plugins
But it was same...

Did I missed adding some additional plugins to solve it?

Here's my simpified code... (Just simple as you can see)

public class TestViewer extends ViewPart {
	public void createPartControl(Composite parent) {
		Button b = new Button(parent, SWT.PUSH);
		b.setText("Click to test");
		b.addSelectionListener(new SelectionListener() {

			public void widgetSelected(SelectionEvent e) {

			public void widgetDefaultSelected(SelectionEvent e) {

	private void fire() {
		IPath path = new Path("ASDF");	// <----- It works
		new MySite();	// Exception occurred while loading a class from ClassLoader


public class MySite extends Site {
    public TargetProvider newProvider(IPath intrasitePath) throws TeamException {
		return new MyTargetProvider(this, intrasitePath);
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