NullPointerException in Page.getCurrent()

Hi all,

I am wirting junit test case. I used mokito to set the current session even i set current session i am getting null pointer exception in below line.

Page.getCurrent().setTitle("My Project");

 Below code is juint test case:

public class UserListViewTest extends AbstractComponent{
 
       private static final long serialVersionUID = 1L;
       UI userListViewTest;
       UserListView userListView;
       ViewChangeEvent event;
       VaadinSession session;
       public static VaadinSession session1;
       UserListTable userListTable;
       VaadinService vaadinService;
        MyVaadinServlet mymockServlet;
        MyVaadinServletService mockService;
        ServletConfig mockServletConfig;
        HttpSession mockHttpSession;
        WrappedSession mockWrappedSession;
        Lock httpSessionLock;
       VaadinRequest request;
       VaadinResponse response;
       User user;
       private JPAContainer<User> container;
       public static UI ui,uI;
 
       @SuppressWarnings("deprecation")
       @Before
       public void setUp() throws Exception {
             
              //Mockito.when(UI.getCurrent()).thenReturn(Mockito.mock(UI.class));
             
              request=org.mockito.Mockito.mock(VaadinRequest.class);
              response=org.mockito.Mockito.mock(VaadinResponse.class);
              vaadinService=org.mockito.Mockito.mock(VaadinService.class);
              vaadinService.setCurrentInstances(request, response);
              vaadinService.setCurrent(vaadinService);
             
              session = org.mockito.Mockito.mock(VaadinSession.class);
              session1=org.powermock.api.mockito.PowerMockito.mock(VaadinSession.class);
              PowerMockito.mockStatic(UI.class);
             
              ui=org.powermock.api.mockito.PowerMockito.mock(UI.class);
              uI=org.powermock.api.mockito.PowerMockito.mock(UI.class);
             
              httpSessionLock = new ReentrantLock();
              mockServletConfig = new MockServletConfig();
              mymockServlet = new MyVaadinServlet();
              mymockServlet.init(mockServletConfig);
 
              mockService = mymockServlet.getService();
              mockHttpSession = Mockito.mock(HttpSession.class);
              mockWrappedSession = new WrappedHttpSession(mockHttpSession) {
                     ReentrantLock lock = new ReentrantLock();
                     {
                    
                           lock.lock();
                     }
                     @Override
                     public Object getAttribute(String name) {
                           Object res;
                           try {
                                  Thread.sleep(100); // for deadlock testing
                                  org.junit.Assert.assertTrue("Deadlock detected", httpSessionLock.tryLock(5, TimeUnit.SECONDS)); // simulates
                                  String lockAttribute = mockService.getServiceName() + ".lock";
                                  if (lockAttribute.equals(name)) {
                                         res = lock;
                                  } else if ("com.vaadin.server.VaadinSession.Mock Servlet".equals(name)) {
                                         res = session;
                                  } else {
                                         res = super.getAttribute(name);
                                  }
                                  httpSessionLock.unlock();
                           } catch (InterruptedException e) {
                                  throw new RuntimeException(e);
                           }
                           return res;
                     }
              };
 
              session = new VaadinSession(mockService);
              user= new User();
              user.setuserId(4l);
              user.setRole("ADMIN");
              user.setUsername("admin");
              user.setPassword("admin");
 
              System.out.println("mockService = " + mockService);
              System.out.println("mockWrappedSession = " + mockWrappedSession);
              System.out.println("session = " + session);
 
              session.storeInSession(mockService, mockWrappedSession);
 
              session.setCurrent(session);
             
              session.setAttribute("loginurl", "loginurl");
 
 
              String loginurl = "www.google.com";
              session.getCurrent().setAttribute("userobj", user);
             
             
       }
 
       @After
       public void tearDown() throws Exception {
       }
 
       @Test
       public void testEnter() {
              userListTable=new UserListTable();
              PersistenceUtil.createEntityManager();
              container = JPAContainerFactory.make(User.class, PersistenceUtil.getEntityManager()); 
              userListTable.createTable();
             
              //page=org.mockito.Mockito.mock(Page.class);
              event=org.mockito.Mockito.mock(ViewChangeEvent.class);
             
              //setCurrent(ui.getSession());
              ui.setSession(org.powermock.api.mockito.PowerMockito.mock(VaadinSession.class));
              ui.setCurrent(org.powermock.api.mockito.PowerMockito.mock(UI.class));
              //ui.setSession(ui.getSession());
             
              ui.getCurrent().setSession(org.powermock.api.mockito.PowerMockito.mock(VaadinSession.class));
              //ui.setCurrent(s);
      
              UI.setCurrent(ui);
                             
              //ui.setParent(uI);
              System.out.println("Ui get current "+ ui.getCurrent());
              System.out.println("Ui get session "+ui.getSession());
              System.out.println("Ui get page "+ui.getPage());
              System.out.println("Page current "+Page.getCurrent());
              userListView = new UserListView();
              userListView.enter(event);
 
       }
 
}

i this what im getting in console
Ui get current uI
Ui get session null
Ui get page null
Page current null
session.getSession = vaadin sessioncom.com.mypoject.views.ListViewTest$1@1387e9b2

Please give some suggestion to me to clear this error Thanks a lot in advance.

A bit hard to follow the code, because of the formatting, but it seems you are mocking the UI class, but you are not mocking the UI.getCurrent() or UI.getPage() so those will return null.