unit testing rest service using juni,mockito

i am new to unit testing, i am trying to test a controller which gets a data from database. My issue is when i am perform get request to uri, i could not able to get the data from database.If i run the application i can able to fetch the data. but i could not do it from test code.

here is my test code:

public class RestTest {

private MockMvc mockMvc;

@Autowired
DataSource dataSource;

 @Autowired
    private Example exampledao;
 @Autowired
    private WebApplicationContext webApplicationContext;
 @Before
    public void setUp() {

        Mockito.reset(exampledao);

        mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).build();
    }
@Test
public void findAllObjects() throws Exception

{
    Components first = new TodoBuilder()
    .cname("asdfasf")
    .mdesc("asdcb")
    .cdesc("asdfa")
    .ccode("asdf")
    .unitrateusd(24)
    .build();

    when(exampledao.list()).thenReturn(Arrays.asList(first));
    mockMvc.perform(get("/getdata"))
    .andExpect(status().isOk())


    .andExpect(content().contentType(TestUtil.APPLICATION_JSON))
   .andExpect(jsonPath("$", hasSize(0)))
     //.andExpect(jsonPath("$", hasSize(0)))
     .andExpect(jsonPath("$[0].cname", is("asdfasf")))
     .andExpect(jsonPath("$[0].mdesc", is("asdcb")))
     .andExpect(jsonPath("$[0].cdesc", is("asdfa")))
      .andExpect(jsonPath("$[0].ccode", is("asdf")))
      .andExpect(jsonPath("$[0].unitrateusd", is(24)));

      verify(exampledao, times(1)).list();

    }

here is my actual controller which i need to check:

@RequestMapping(value="/getdata" , method=RequestMethod.GET)
    public   List<Components> listContact(ModelAndView model) throws IOException{
        System.out.println("hii.. i made atest call");
        List<Components> listContact;
        listContact= exampeldao.list();


        System.out.println("  but i dnt have any data.....");

        return listContact;

    }

I can make a call from test controller to "/getdata". But listContact=exampeldao.list() is not executing, list() is defined in some other class.but i can able to print next print statement.

when i run testclass i am getting some SecurityException:class"org.hamcrest.Matchers" signature information does not match with signature information of other class in same package.

can any let me know where i am going wrong