java.lang.NoSuchMethodError：javaxservlet.http.HttpServletRequest.isAsyncStarted（）Z

Question

I am trying to run a test with JUnit and Mockito against a spring REST webservice I am building. I came across a bug when trying to run the JUnit test and can't find any information on the problem. The stacktrace is listing the error line as the .andDo(print()) though I got that line directly from a spring.io tutorial http://spring.io/guides/tutorials/rest/3/

Test class code:

public class TestSuite {
    MockMvc mockMvc;

@Mock
RestController controller;

@Before
public void setup(){
    MockitoAnnotations.initMocks(this);
    this.mockMvc = standaloneSetup(controller)
        .setMessageConverters(new MappingJackson2HttpMessageConverter()).build();
}

@Test
public void testREST() throws Exception {
    when(controller.getThing(any(Integer.class))).thenReturn(TestFixture.getREST(1));
    this.mockMvc.perform(get("/{number}", String.valueOf(number))
    .accept(MediaType.APPLICATION_JSON))
    .andDo(print())
    .andExpect(status().isNotFound());
}}

Stacktrace:

java.lang.NoSuchMethodError: javax.servlet.http.HttpServletRequest.isAsyncStarted()Z
at org.springframework.test.web.servlet.result.PrintingResultHandler.printAsyncResult(PrintingResultHandler.java:131)
at org.springframework.test.web.servlet.result.PrintingResultHandler.handle(PrintingResultHandler.java:80)
at org.springframework.test.web.servlet.MockMvc$1.andDo(MockMvc.java:155)
at org.company.test.TestSuite.testREST(TestSuite.java:53)`

Answer 1

You are using an older version of the Servlet spec (eg, 2.5); whereas, the version of spring-test that you are using requires at least Servlet 3.0.

As mentioned in the Testing Improvements section of the reference manual,

As of Spring 4.0, the set of mocks in the org.springframework.mock.web package is now based on the Servlet 3.0 API.

So, although Spring Framework 4.0 and 4.1 support Servlet 2.5 for deployment , the Servlet API mocks and the Spring MVC Test Framework in the spring-test module require Servlet 3.0 (specifically version 3.0.1 or higher).

Regards,

Sam (lead of the spring-test module)

Answer 2

I was getting this error because the dependency to servlet hadn't been added to my pom.xml adding the next few lines solved my issue

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.1.0</version>
    <scope>test</scope>
</dependency>