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
IResource parentRes= getResource(parent);
		IJavaElement parentElement= JavaCore.create(parentRes);
		if (parentElement != null)
			return parentElement;
		return getResource(parent);	
	}
	
	private static Object computeCommonParent(Object e1, Object e2){
		IResource r1= getResource(e1);
		IResource r2= getResource(e2);	
		if (r1 == null && r2 == null)
			return null;
		if (r1 == null)
			return r2.getParent();
		if (r2 == null)
			return r1.getParent();
		
		if (r1.equals(r2))
			return r1.getParent();
			
		if (r1.getFullPath().isPrefixOf(r2.getFullPath()))
			return r1;
		if (r2.getFullPath().isPrefixOf(r1.getFullPath()))
			return r2;
						
		IPath p1= r1.getParent().getFullPath();
		IPath p2= r2.getParent().getFullPath();
		IPath commonPath= new Path("");
		int segCount= Math.min(p1.segmentCount(), p2.segmentCount());
		for (int i= 0; i < segCount; i++){