How to write JUnit test with Spring Autowire?

Make sure you have imported the correct package. If I remeber correctly there are two different packages for Autowiring. Should be :org.springframework.beans.factory.annotation.Autowired;

Also this looks wierd to me :

@ContextConfiguration("classpath*:conf/components.xml")

Here is an example that works fine for me :

@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(locations = { "/applicationContext_mock.xml" })public class OwnerIntegrationTest {    @Autowired    OwnerService ownerService;    @Before    public void setup() {        ownerService.cleanList();    }    @Test    public void testOwners() {        Owner owner = new Owner("Bengt", "Karlsson", "Ankavägen 3");        owner = ownerService.createOwner(owner);        assertEquals("Check firstName : ", "Bengt", owner.getFirstName());        assertTrue("Check that Id exist: ", owner.getId() > 0);        owner.setLastName("Larsson");        ownerService.updateOwner(owner);        owner = ownerService.getOwner(owner.getId());        assertEquals("Name is changed", "Larsson", owner.getLastName());    }

I've done it with two annotations for test class: @RunWith(SpringRunner.class) and @SpringBootTest.Example:

@RunWith(SpringRunner.class )@SpringBootTestpublic class ProtocolTransactionServiceTest {    @Autowired    private ProtocolTransactionService protocolTransactionService;}

@SpringBootTest loads the whole context, which was OK in my case.

A JUnit4 test with Autowired and bean mocking (Mockito):

// JUnit starts with spring context@RunWith(SpringRunner.class)// spring loads context configuration from AppConfig class@ContextConfiguration(classes = AppConfig.class)// overriding some properties with test values if you need@TestPropertySource(properties = {        "spring.someConfigValue=your-test-value",})public class PersonServiceTest {    @MockBean    private PersonRepository repository;    @Autowired    private PersonService personService; // uses PersonRepository        @Test    public void testSomething() {        // using Mockito        when(repository.findByName(any())).thenReturn(Collection.emptyList());        Person person = new Person();        person.setName(null);        // when        boolean found = personService.checkSomething(person);        // then        assertTrue(found, "Something is wrong");    }}