EJB - 序列化錯誤，而這樣做的有狀態會話bean

Question

JNDI查找在我的EJB項目中，我有這個會話Bean（有狀態）：

@Stateful 
public class StatefulShopCart implements StatefulShopCartLocal, Serializable { 

    private static final long serialVersionUID = 1L; 

    private transient HashMap<Integer, Integer> cantitati; 
    private Vector<ProdusDTO> produse; 

    /** 
    * Default constructor. 
    */ 
    public StatefulShopCart() { 
     try{ 
      cantitati = new HashMap<Integer, Integer>(); 
      produse = new Vector<ProdusDTO>(); 
     }catch(Exception ex) { 
      System.out.println("[[[ //// Error \\\\ ]]]: "+ex.getMessage()); 
      System.out.println(ex.getStackTrace()); 
     } 
    } 

    @Override 
    public void Adauga(int id) { 
     try { 
      InitialContext ctx = new InitialContext(); 
      StatelessInterogareRemote bean = (StatelessInterogareRemote) ctx 
       .lookup("java:global/ShopEAP/ShopEJB/StatelessInterogare"); 
        ... 
     }catch(Exception ex) { 
      System.out.println("[[[ Error ]]]: "+ex.getMessage()); 
      System.out.println(ex.getStackTrace()); 
     } 
    } 

    @Override 
    public Vector<ProdusDTO> ProduseAdaugate() { 
     return produse; 
    } 

    //@Override 
    public HashMap<Integer, Integer> CantitatiProduse() { 
     return cantitati; 
    } 

    @Override 
    public double ValoareTotala() { 
     StatelessCartLocal beanCart = null; 
     try { 
      InitialContext ctx = new InitialContext(); 
      beanCart = (StatelessCartLocal) ctx 
       .lookup("java:global/ShopEAP/ShopEJB/StatelessCart"); 
     }catch(Exception ex) { 
      System.out.println("+++ Error +++ " + ex.getMessage() + "\r\n" + ex.getStackTrace()); 
     } 
     return beanCart.Calculeaza(produse, cantitati); 
    } 

} 

接口StatefulShopCartLocal：

@Local 
public interface StatefulShopCartLocal { 
    void Adauga(int id); 
    Vector<ProdusDTO> ProduseAdaugate(); 
    HashMap<Integer, Integer> CantitatiProduse(); 
    double ValoareTotala(); 
} 

當我在Application Client Project中查找：

InitialContext ctx = new InitialContext(); 
beanCart = (StatelessCartLocal) ctx 
    .lookup("java:global/ShopEAP/ShopEJB/StatelessCart"); 

我收到此錯誤：

Nov 1, 2011 1:15:46 PM com.sun.enterprise.transaction.JavaEETransactionManagerSimplified initDelegates 
INFO: Using com.sun.enterprise.transaction.jts.JavaEETransactionManagerJTSDelegate as the delegate 
Nov 1, 2011 1:15:47 PM com.sun.enterprise.naming.impl.SerialContext lookup 
SEVERE: enterprise_naming.serialctx_communication_exception 
Nov 1, 2011 1:15:47 PM com.sun.enterprise.naming.impl.SerialContext lookup 
SEVERE: 
java.rmi.MarshalException: CORBA BAD_PARAM 1330446342 Maybe; nested exception is: 
    java.io.NotSerializableException: ----------BEGIN server-side stack trace---------- 
org.omg.CORBA.BAD_PARAM: vmcid: OMG minor code: 6 completed: Maybe 
    at com.sun.corba.ee.impl.logging.OMGSystemException.notSerializable(OMGSystemException.java:990) 
    at com.sun.corba.ee.impl.logging.OMGSystemException.notSerializable(OMGSystemException.java:1005) 
    at com.sun.corba.ee.impl.orbutil.ORBUtility.throwNotSerializableForCorba(ORBUtility.java:753) 
    at com.sun.corba.ee.impl.encoding.CDROutputStream_1_0.write_abstract_interface(CDROutputStream_1_0.java:765) 
    at com.sun.corba.ee.impl.encoding.CDROutputObject.write_abstract_interface(CDROutputObject.java:709) 

... 

at javax.naming.InitialContext.lookup(InitialContext.java:392) 
    at Main.runTest(Main.java:49) 
    at Main.main(Main.java:17) 
Caused by: java.io.NotSerializableException: ----------BEGIN server-side stack trace---------- 
org.omg.CORBA.BAD_PARAM: vmcid: OMG minor code: 6 completed: Maybe 
    at com.sun.corba.ee.impl.logging.OMGSystemException.notSerializable(OMGSystemException.java:990) 
    at com.sun.corba.ee.impl.logging.OMGSystemException.notSerializable(OMGSystemException.java:1005) 

... 

我認爲這是會話bean的序列化問題，但是我做錯了什麼？

謝謝。

Answer 1

我對你怎麼能在這裏訪問會話bean的一個樣本：從遠程客戶端，並從當地一個

http://javastuff.info/?p=110

。

對於你不再需要初始上下文相同的應用程序服務器上的本地接入，可以通過@EJB