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diff --git a/case-study/jdt-before/ui/org/eclipse/jdt/ui/actions/RemoveFromClasspathAction.java b/case-study/jdt-before/ui/org/eclipse/jdt/ui/actions/RemoveFromClasspathAction.java
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+++ b/case-study/jdt-before/ui/org/eclipse/jdt/ui/actions/RemoveFromClasspathAction.java
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+/*******************************************************************************
+ * Copyright (c) 2000, 2011 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.jdt.ui.actions;
+
+import java.lang.reflect.InvocationTargetException;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.SubProgressMonitor;
+
+import org.eclipse.core.resources.IResource;
+import org.eclipse.core.resources.IWorkspaceRunnable;
+
+import org.eclipse.jface.viewers.IStructuredSelection;
+
+import org.eclipse.ui.IWorkbenchSite;
+import org.eclipse.ui.PlatformUI;
+
+import org.eclipse.jdt.core.IClasspathEntry;
+import org.eclipse.jdt.core.IPackageFragmentRoot;
+import org.eclipse.jdt.core.JavaModelException;
+
+import org.eclipse.jdt.internal.corext.util.JavaModelUtil;
+
+import org.eclipse.jdt.internal.ui.IJavaHelpContextIds;
+import org.eclipse.jdt.internal.ui.JavaPlugin;
+import org.eclipse.jdt.internal.ui.actions.ActionMessages;
+import org.eclipse.jdt.internal.ui.actions.WorkbenchRunnableAdapter;
+import org.eclipse.jdt.internal.ui.util.ExceptionHandler;
+
+/**
+ * Action to remove package fragment roots from the classpath of its parent
+ * project. Currently, the action is applicable to selections containing
+ * non-external archives (JAR or zip).
+ *
+ * <p>
+ * This class may be instantiated; it is not intended to be subclassed.
+ * </p>
+ *
+ * @since 2.1
+ *
+ * @noextend This class is not intended to be subclassed by clients.
+ */
+public class RemoveFromClasspathAction extends SelectionDispatchAction {
+
+	/**
+	 * Creates a new <code>RemoveFromClasspathAction</code>. The action requires
+	 * that the selection provided by the site's selection provider is of type
+	 * <code> org.eclipse.jface.viewers.IStructuredSelection</code>.
+	 *
+	 * @param site the site providing context information for this action
+	 */
+	public RemoveFromClasspathAction(IWorkbenchSite site) {
+		super(site);
+		setText(ActionMessages.RemoveFromClasspathAction_Remove);
+		setToolTipText(ActionMessages.RemoveFromClasspathAction_tooltip);
+		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.REMOVE_FROM_CLASSPATH_ACTION);
+	}
+
+	/* (non-Javadoc)
+	 * Method declared in SelectionDispatchAction
+	 */
+	@Override
+	public void selectionChanged(IStructuredSelection selection) {
+		setEnabled(checkEnabled(selection));
+	}
+
+	private static boolean checkEnabled(IStructuredSelection selection) {
+		if (selection.isEmpty())
+			return false;
+		for (Iterator<?> iter= selection.iterator(); iter.hasNext();) {
+			if (! canRemove(iter.next()))
+				return false;
+		}
+		return true;
+	}
+
+	/* (non-Javadoc)
+	 * Method declared in SelectionDispatchAction
+	 */
+	@Override
+	public void run(final IStructuredSelection selection) {
+		try {
+			PlatformUI.getWorkbench().getActiveWorkbenchWindow().run(true, true, new WorkbenchRunnableAdapter(new IWorkspaceRunnable() {
+				public void run(IProgressMonitor pm) throws CoreException {
+					try{
+						IPackageFragmentRoot[] roots= getRootsToRemove(selection);
+						pm.beginTask(ActionMessages.RemoveFromClasspathAction_Removing, roots.length);
+						for (int i= 0; i < roots.length; i++) {
+							int jCoreFlags= IPackageFragmentRoot.NO_RESOURCE_MODIFICATION | IPackageFragmentRoot.ORIGINATING_PROJECT_CLASSPATH;
+							roots[i].delete(IResource.NONE, jCoreFlags, new SubProgressMonitor(pm, 1));
+						}
+					} finally {
+						pm.done();
+					}
+				}
+		}));
+		} catch (InvocationTargetException e) {
+			ExceptionHandler.handle(e, getShell(),
+					ActionMessages.RemoveFromClasspathAction_exception_dialog_title,
+					ActionMessages.RemoveFromClasspathAction_Problems_occurred);
+		} catch (InterruptedException e) {
+			// canceled
+		}
+	}
+
+	private static IPackageFragmentRoot[] getRootsToRemove(IStructuredSelection selection){
+		List<Object> result= new ArrayList<Object>(selection.size());
+		for (Iterator<?> iter= selection.iterator(); iter.hasNext();) {
+			Object element= iter.next();
+			if (canRemove(element))
+				result.add(element);
+		}
+		return result.toArray(new IPackageFragmentRoot[result.size()]);
+	}
+
+	private static boolean canRemove(Object element){
+		if (! (element instanceof IPackageFragmentRoot))
+			return false;
+		IPackageFragmentRoot root= (IPackageFragmentRoot)element;
+		try {
+			IClasspathEntry cpe= root.getRawClasspathEntry();
+			if (cpe == null || cpe.getEntryKind() == IClasspathEntry.CPE_CONTAINER)
+				return false; // don't want to remove the container if only a child is selected
+			return true;
+		} catch (JavaModelException e) {
+			if (JavaModelUtil.isExceptionToBeLogged(e))
+				JavaPlugin.log(e);
+		}
+		return false;
+	}
+}
+