java.lang.NoSuchMethodError: javax.servlet.http.HttpServletRequest.isAsyncStarted() while using Mockito with Junit
java, junit, mocking, mockito, mockmvc
Solution
This sounds very much like you have the wrong version of the servlet API in the class path.
Check when `isAsyncStarted` was added to the API and make sure the one you reference in your classpath is at least that version or higher.
In order to find the location where the 'wrong' class version is comming from you can use the
-verbose:class
Argument for java. It will list all the classes loaded and if I remember correctly whery they get loaded from. See http://docs.oracle.com/javase/7/docs/technotes/tools/windows/java.html for details.
Problem
I am trying to get my feet wet with TDD. I am trying to write unit test cases for controllers using Mockito in conjunction with MockMvc and Junit. But I am getting a runtime error thereby failing my test. At first I was facing problem in initializing the MockMvc instance in the setup due to failure in finding the `javax.servlet.SessionCookieConfig`. This I resolved by downloading the `javax.servlet` api and configuring it into the build path of the project but then I am facing the ``` java.lang.NoSuchMethodError: javax.servlet.http.HttpServletRequest.isAsyncStarted() ``` while using `perform()` on the MockMvc instance. Can anyone tell me what to do with this kind of dependencies as I think it is occurring due to the incompatible server servlet-api and javax.servlet api. EDIT : I am posting the code I am using using for unit testing but I don't think it would be any help but just in case : ``` @RunWith(MockitoJUnitRunner.class) public class MyControllerTest { @InjectMocks private MyController myController = new MyController(); @Mock private MyService myService = new MyServiceImpl(); private MockMvc mockMvc; @Before public void setUp(){ this.mockMvc = MockMvcBuilders.standaloneSetup(myController).build(); } @Test public void testList() throws Exception{ A a = new A(); a = createMockClassA(); Mockito.when(myService.getServiceForA(Mockito.anyMapOf(String.class, String.class))).thenReturn(a); MvcResult result = this.mockMvc.perform(get("/somePath/")).param("someExpectedParam","value").andReturn(); System.out.println(result.getResponse().getContentAsString()); } private static A createMockClassA(){ A a = new A(); a.setId(i); a.setTitle("mock-" + i); return a; } } ```