btnAddPerson.addMouseListener(new MouseAdapter() {
			@Override
			public void mouseDown(MouseEvent e) {				
				System.out.println(person.getFirstName());
				ResourceSet resourceSet = new ResourceSetImpl();
				URI fileURI = URI.createFileURI(SmartSignResourceUtil.getPath(DataPart.Persons));
				Resource resource = resourceSet.createResource(fileURI);
				resource.getContents().add(person);
				
				try {
					final Map<Object, Object> saveOptions = new HashMap<Object, Object>();
					saveOptions.put(Resource.OPTION_SAVE_ONLY_IF_CHANGED, Resource.OPTION_SAVE_ONLY_IF_CHANGED_MEMORY_BUFFER);
					saveOptions.put(XMLResource.OPTION_KEEP_DEFAULT_CONTENT, true);
					
					resource.save(saveOptions);
				} catch (IOException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
				setTextTextbox();
			}
		});

 loadResource = resourceSet.getResource(fileURI, true);

public void save(EObject object)
	{
		
		ResourceSet resourceSet = new ResourceSetImpl();
		URI fileURI;
		EList<EObject> list = null;
		Resource loadResource = null;
		if (object instanceof Person)
		{
			fileURI = URI.createFileURI(SmartSignResourceUtil.getPath(DataPart.Persons));
		}
		else if (object instanceof Group)
		{
			fileURI = URI.createFileURI(SmartSignResourceUtil.getPath(DataPart.Groups));
		}
		else if (object instanceof Address)
		{
			fileURI = URI.createFileURI(SmartSignResourceUtil.getPath(DataPart.Addresses));
		}
		else if (object instanceof Contact)
		{
			fileURI = URI.createFileURI(SmartSignResourceUtil.getPath(DataPart.Contacts));
		}
		else
		{
			fileURI = null;
		}
		if(resourceSet.getURIConverter().exists(fileURI, null))
		{
			loadResource = resourceSet.getResource(fileURI, true);           //<--- here is the error
			list = loadResource.getContents();			
		}
		list.add(object);
		Resource resource = resourceSet.createResource(fileURI);
		resource.getContents().addAll(list);
		
		try {
			final Map<Object, Object> saveOptions = new HashMap<Object, Object>();
			saveOptions.put(Resource.OPTION_SAVE_ONLY_IF_CHANGED, Resource.OPTION_SAVE_ONLY_IF_CHANGED_MEMORY_BUFFER);
			saveOptions.put(XMLResource.OPTION_KEEP_DEFAULT_CONTENT, true);
			
			resource.save(saveOptions);
		} catch (IOException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
	}