我目前正在使用 Axon 4.2，并且我有一個在其方法中使用注入服務(CustomerService)的聚合(Customer)。@CommandHandlers下面顯示了它的簡化版本（但對于本示例仍然有效）。@Aggregatepublic class Customer {  @AggregateIdentifier  private Long id;  private String name;  private String address;  @CommandHandler  public Customer(CreateCommand command, CustomerService customerService) {    log.debug( customerService.doSomething(command.getId()));    AggregateLifecycle.apply(new CreatedEvent(command.getId(), command.getName()));  }  @CommandHandler  public void on(UpdateCommand command, CustomerService customerService){    log.debug( customerService.doSomething(command.getId()));    AggregateLifecycle.apply( new UpdatedEvent(command.getId(),command.getAddress()));  }  @EventSourcingHandler  public void on(CreatedEvent event){    this.id = event.getId();    this.name = event.getName();  }  @EventSourcingHandler  public void on(UpdatedEvent event){      this.address = event.getAddress();  }}這是相應的測試：@RunWith(MockitoJUnitRunner.class)public class CustomerTest {  @Mock  private CustomerService customerService;  private FixtureConfiguration<Customer> fixture;  @Before  public void setUp() {    fixture = new AggregateTestFixture<>(Customer.class);    fixture.registerInjectableResource(customerService);  }  @Test  public void testCreation(){    final Long id = 1L;    final String name = "Elmo";    when(customerService.doSomething(id)).thenReturn("called");    fixture.givenNoPriorActivity()            .when(new CreateCommand(id, name))            .expectEvents(new CreatedEvent(id, name));    verify(customerService).doSomething(id);    verifyNoMoreInteractions(customerService);  }  @Test  public void testUpdate(){    final Long id = 1L;    final String name = "Elmo";    final String address = "Sesame street";    when(customerService.doSomething(id)).thenReturn("called");  }}如果我刪除 on UpdateCommand 方法中的 CustomerService 參數（以及相關代碼），則 testUpdate() 測試通過，因此問題似乎出在依賴注入中。