Unittest Spring @RestController PUT-Method

is it possible to test the PUT-Method of a Controller like this:

@RestController
@RequestMapping("/EventListenerProcessor")
public class EventListenerProcessorController {

    @Autowired
    EventListenerRepository eventListenerRepository;

    @Autowired
    EventListenerProcessor eventListenerProcessor;

    @RequestMapping(value = "/{eventName}", method = RequestMethod.PUT)
    public void processEvent(@PathVariable("eventName") Event event){

        if(event == null){
            throw new EventDoesNotExistException();
        }

        ArrayList<EventListener> eventListeners = Lists.newArrayList(eventListenerRepository.findByEvent(event));

        for(EventListener eventListener : eventListeners){
            eventListenerProcessor.processEventListener(eventListener);
        }

    }

    @ResponseStatus(value= HttpStatus.NOT_FOUND, reason = "No such event.")
    public class EventDoesNotExistException extends RuntimeException{
    }
}

with a testcase like this:

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = MockServletContext.class)
@WebAppConfiguration
public class EventProcessorControllerTest {

    private MockMvc mvc;

    @Before
    public void setUp() throws Exception {
        mvc = MockMvcBuilders.standaloneSetup(new EventListenerProcessorController()).build();
    }

    @Test
    public void postEventTest() throws Exception {
        mvc.perform(MockMvcRequestBuilders.
                put("/EventListenerProcessor/{eventName}", "Test"))
                .andExpect(status().isNotFound());
    }
}

My Problem is that i alwas get StatusCode 500 instead of 404. I think this happens because of the mapping of the eventName to a Event Object and the reduced Context of the Testcase. But I don't really want to load the whole application context. Is there any other more elegant way to test this Controller?