如何使HK2 ServiceLocator使用从其桥接的ServiceLocator中的Singleton服务实例？

Question

ExtrasUtilities.bridgeServiceLocator()通过将应用程序ServiceLocator桥接到Jersey
ServiceLocator，我们正在使用来将在一个ServiceLocator中创建的现有Singleton应用程序服务注入Jersey RESTful
Web服务。

但是，没有使用“外部”定位器中存在的Singletons-
将每个服务注入到Jersey服务中后都会再次创建它们。似乎Singleton仅在ServiceLocator的范围内可见，即使已桥接也是如此。

这是预期的行为吗？如果是这样，是否有任何方法可以更改此行为，并在桥接的ServiceLocators中具有真正的Singleton？

我已将问题提取到一组测试类中，这些类说明了以下几点：

public class BridgedServiceTest
{
  private ServiceLocator _outerServiceLocator;
  private ServiceLocator _innerServiceLocator;

  @Test
  public void testBridgedInnerServiceOK() throws Exception
  {
    ServiceLocatorFactory serviceLocatorFactory = ServiceLocatorFactory.getInstance();

    _outerServiceLocator = serviceLocatorFactory.create("Outer");
    ServiceLocatorUtilities.addClasses(_outerServiceLocator, SingletonServiceImpl.class);

    _innerServiceLocator = serviceLocatorFactory.create("Inner");
    ExtrasUtilities.bridgeServiceLocator(_innerServiceLocator, _outerServiceLocator);

    final Client client1 = new Client();
    _outerServiceLocator.inject(client1);
    assertThat(SingletonServiceImpl.instanceCount.get(), Matchers.is(1));
    client1.test();

    final Client client2 = new Client();
    _innerServiceLocator.inject(client2);
    // next line fails as instance count is 2
    assertThat(SingletonServiceImpl.instanceCount.get(), Matchers.is(1));
    client2.test();
  }

  @After
  public void tearDown() throws Exception
  {
    _innerServiceLocator.shutdown();
    _outerServiceLocator.shutdown();
  }
}

@Contract
public interface SingletonService
{
  void fulfil();
}

@Service
public class SingletonServiceImpl implements SingletonService
{
  public static AtomicInteger instanceCount = new AtomicInteger();

  @PostConstruct
  public void postConstruct()
  {
    instanceCount.incrementAndGet();
  }

  @Override
  public void fulfil()
  {
    System.out.println("Contract Fulfilled.");
  }
}

public class Client
{
  @Inject
  private SingletonService _singletonService;

  public void test()
  {
    _singletonService.fulfil();
  }

  public SingletonService getSingletonService()
  {
    return _singletonService;
  }
}

Answer 1

ServiceLocator桥中有一个错误已修复。该修复程序将在hk2 2.5.0-b07或更高版本中！