CODEWITHSUNDEEP
springmocking
valik
valik

Reputation: 2094

Java.lang.NullPointerException what's wrong

It says error in this method a null pointer 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())));
     }
}

Other than that everything seems to be correct

This is the error I got after mocking the book service first before call

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

And this is my edit to the test method @Test public void showBookListPage() throws 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())));
}

And by the way this is the controller 

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

    }

Upvotes: 0

Views: 724

Answers (1)

pavan
pavan

Reputation: 16

You have to mock the bookService before using it. Not after it's usage. So do the mocking of bookService in @BeforeMethod

Upvotes: 0

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