從singletone遷移到java ee injection

Question

我有Jboss AS 6.1和war和sar應用程序。我用cassandra。所以我需要管理員訪問數據庫和緩存數據庫對象以便快速訪問。 所以我做了這樣的方式：

public class AsaBlackSubsManager extends OperatorsCache<AsaBlackSubs> { 
    private final static Logger log = Logger.getLogger(AsaBlackSubsManager.class); 
    private final static String CF_NAME = "asa_black_subs"; 
    private static AsaBlackSubsManager instance = null; 
    private MsisdnManager msisdnManager; 

    private AsaBlackSubsManager() { 
     reload(); 
     msisdnManager = new MsisdnManager(); 
    } 

    public static AsaBlackSubsManager getInstance() { 
     if (instance == null) { 
      instance = new AsaBlackSubsManager(); 
     } 
     return instance; 
    } 

    public List<AsaBlackSubs> list() { 
     final List<AsaBlackSubs> list = new ArrayList<>(); 
     final Statement query = QueryBuilder.select().from(CF_NAME); 
     final ResultSet rows = BasicManager.getInstance().getSession().execute(query); 
     for (final Row row : rows) { 
      if (row != null && row.getString("name") != null) { 
       final AsaBlackSubs subs = new AsaBlackSubs(); 
       subs.setId(row.getUUID("id").toString()); 
       subs.setName(row.getString("name")); 
       subs.setOperatorId(row.getString("operatorId")); 
       subs.setParams(row.getString("params")); 
       subs.setDescription(row.getString("description")); 
       subs.setParentId(row.getString("parentId")); 
       subs.setOwner(row.getString("owner")); 
       list.add(subs); 
      } 
     } 
     Collections.sort(list, new HierarchyObjectComparator()); 
     return list; 
    } 

    public String create(final AsaBlackSubs subs) { 
     if (subs.getId() == null) { 
      final UUID uuid = UUID.randomUUID(); 
      subs.setId(uuid.toString()); 
     } 
     final Insert query = QueryBuilder.insertInto(CF_NAME) 
       .value("id", UUID.fromString(subs.getId())) 
       .value("name", subs.getName()) 
       .value("operatorId", subs.getOperatorId()) 
       .value("params", subs.getParams()) 
       .value("description", subs.getDescription()) 
       .value("owner", subs.getOwner()) 
       .value("parentId", subs.getParentId()); 
     BasicManager.getInstance().getSession().execute(query); 
     reload(); 
     return subs.getId(); 
    } 

} 

我也有我的地方對象的緩存，通過運營商來分類的抽象緩存類。

public abstract class OperatorsCache<T extends OperatoredObject> { 

    protected List<T> cache; 
    protected Map<String, List<T>> mapByOperator; 

    public abstract List<T> list(); 

    public void reload() { 
     cache = new CopyOnWriteArrayList<>(list()); 
     mapByOperator = cache.parallelStream() 
       .collect(Collectors.groupingBy(OperatoredObject::getOperatorId)); 
    } 

    public List<T> cachedList() { 
     return new ArrayList<>(cache); 
    } 

    public List<T> cachedListByOperator(final String operatorId) { 
     return mapByOperator.getOrDefault(operatorId, new ArrayList<>()); 
    } 

    public T get(final String id) { 
     final Optional<T> any = cache 
       .parallelStream() 
       .filter(obj -> obj.getId().equals(id)) 
       .findAny(); 
     return any.isPresent() ? any.get() : null; 
    } 

} 

所以這樣我可以從戰爭和SAR訪問我的課，從任何地方和緩存將是相同的。這個緩存只有一個對象。經理級本身就是在sar中。 這是一個相當不錯的方式，但我知道單身人士的弱點，所以我決定用焊接依賴注入替代我的單身人士，這是集成在Jboss中的。我這樣做：刪除私人構造函數和getInstance（）方法，並添加@ApplicationScope註釋。在我的網上課，我只是註釋@Inject。就像這樣：

public class CreateAsaSubsb extends BaseAction { 


    @Inject 
    AsaBlackSubsManager manager; 

    public void perform(final HttpServletRequest request, 
         final HttpServletResponse response, final JSONObject jsonObject) throws ServletException, IOException, JSONException 
... 

但是，當我試圖啓動這一切，戰爭應用程序不啓動，我有這樣的例外： org.jboss.weld.exceptions.DeploymentException：類型WELD-001408不滿意的依賴[AsaBlackSubsManager]帶有限定符[@Default]在注入點[[字段] @Inject

我正在尋找答案几天，但我仍然可以弄清楚：我做錯了什麼？

Answer 1

JBoss AS 6是一個Java EE 6應用服務器。根據CDI 1.0 spec（它是Java EE 6的一部分），您必須在存檔中放置beans.xml文件：在WAR-WEB-INF /目錄中，在META-INF /目錄中爲jar。