Java.lang.NullPointerException ce qui est erroné

Question

Il dit erreur dans cette méthode un pointeur NULL Exception

@Test 
    public void showBookListPage() throws Exception { 

     List<Book> expectedBookList = bookService.findAll(); 
       BookService bookService = mock(BookService.class); 

      when(bookService.findAll()).thenReturn(expectedBookList); 

     BookController bookController = new BookController(bookService); 
     MockMvc mockMvc = standaloneSetup(bookController).build(); 

     mockMvc.perform(get(" /book/bookList")) 
     .andExpect(view().name("bookList")) 
     .andExpect(model().attributeExists("bookList")) 
     .andExpect(model().attribute("bookList", hasItems(expectedBookList.toArray()))); 
    } 
} 

Autre que que tout semble être correct

C'est l'erreur que je suis arrivé après se moquant du service de livres d'abord avant l'appel

java.lang.IllegalStateException: missing behavior definition for the preceding method call: 
BookService.findAll() 
Usage is: expect(a.foo()).andXXX() 

    at org.easymock.internal.MockInvocationHandler.invoke(MockInvocationHandler.java:42) 
    at org.easymock.internal.ObjectMethodsFilter.invoke(ObjectMethodsFilter.java:94) 
    at com.sun.proxy.$Proxy134.findAll(Unknown Source) 
    at com.admintest.controller.BookControllerTest.showBookListPage(BookControllerTest.java:101) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) 
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) 
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) 
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) 
    at org.springf 

Et voici ma modifier la méthode de test @Test de public void showBookListPage() t hrows Exception {

 BookService bookService = mock(BookService.class); 
     List<Book> expectedBookList = bookService.findAll(); 
     when(bookService.findAll()).thenReturn(expectedBookList); 

     BookController bookController = new BookController(bookService); 
     MockMvc mockMvc = standaloneSetup(bookController).build(); 

     mockMvc.perform(get(" /book/bookList")) 
       .andExpect(view().name("bookList")) 
       .andExpect(model().attributeExists("bookList")) 
       .andExpect(model().attribute("bookList", hasItems(expectedBookList.toArray()))); 
} 

Et par la façon dont c'est le contrôleur

@RequestMapping("/bookList") 
    public String bookList(Model model) { 
     List<Book> bookList = bookService.findAll(); 
     model.addAttribute("bookList", bookList); 
     return "bookList"; 

    } 

Answer 1

Vous devez se moquer de la Bookservice avant de l'utiliser. Pas après son utilisation. Donc, le moqueur de bookService dans @BeforeMethod