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
public ReorgDestinationAction(String name, ISelectionProvider provider) {
		super(name, provider);
	}
	
	public ReorgDestinationAction(String name, StructuredSelectionProvider provider) {
		super(name, provider);
	}
	public void run() {
		List elements= getStructuredSelection().toList();
		if (!ensureSaved(elements, getActionName()))
			return;
		ReorgRefactoring refactoring= createRefactoring(elements);
		
		setUnsavedFileList(refactoring, elements);
		Object destination= selectDestination(refactoring);
		if (destination == null)
			return;
		try{			
			String duplicate= getDuplicatedElementName(elements);
			if (duplicate != null){
				String message= "Two or more elements named " + duplicate + " are selected."; 
				MessageDialog.openInformation(JavaPlugin.getActiveWorkbenchShell().getShell(), "Duplicate Element Name",	message);
				return;
			}