Bug 7914 Cannot copy a Java project in the packages view
There is no way to copy a Java project in the packages view. You can copy a project in the Navigator. This is a functional gap.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/reorg/ReorgDestinationAction.java
refactoring.setDestination(destination);
			
			Set excluded= getExcluded(refactoring);
			if (excluded == null) 
				return;
			if (excluded.size() == elements.size())
				return;
			refactoring.setExcludedElements(excluded);	
				
			if (! isOkToProceed(refactoring))
				return;
			doReorg(refactoring);
		} catch (JavaModelException e){
			ExceptionHandler.handle(e, "Exception", "Unexpected exception occurred. See log for details.");
		}	
	}
	
	/**
	 * returns null if no 2 elements have the same name
	 */
	private static  String getDuplicatedElementName(List elements){
		String[] names= getElementNames(elements);
		if (names.length == 0)
			return null;
		Arrays.sort(names);	
		String last= names[0];	
		for (int i= 1; i < names.length; i++){ 
			if (last.equals(names[i]))
				return last;