Question

我有一个无状态豆

 @Stateless
 public class CalculatorImpl implements Calculator {
 private static final long serialVersionUID = 1L;
 @Override
  public int add(int a, int b) {
return a+b;
  }
    @Override
   public int sub(int a, int b) {
return a-b;
   }
   @Override
   public int mul(int a, int b) {
return a*b;
  }
   @Override
    public float div(int a, int b) {
return a/b;
   }
    }

我已将此部署在glassfish上，界面注释为@Remote

  @Remote
  public interface Calculator extends Serializable{
  public int add(int a, int b)throws RemoteException;
  public int sub(int a, int b)throws RemoteException;
   public int mul(int a, int b)throws RemoteException;
   public float div(int a, int b)throws RemoteException;
  }

当我尝试通过客户端访问它时，即java桌面应用程序：它抛出一个NullpointerException

客户代码：

      MyClient client= new MyClient();
  Properties props = new Properties();
  props.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.enterprise.naming.SerialInitContextFactory");
  props.setProperty("org.omg.CORBA.ORBInitialHost", "localhost");

  // glassfish default port value will be 3700, 
  // but im using tcpviewer to redirect my 50005 port to 3700
  props.setProperty("org.omg.CORBA.ORBInitialPort", "3700");

  InitialContext context = new InitialContext(props);

 client.cart = (ShoppingCart) context
        .lookup("java:global/EJBDemo2EAR/EJBDemo2/CalculatorImpl!com.java.stateless.Calculator");
System.out.println("In doget");
client.cart.buy("soap", 12);
client.cart.getCartContents();

错误是：显示java.lang.NullPointerException at com.sun.enterprise.naming.impl.SerialContext.getORB（SerialContext.java:347） at com.sun.enterprise.naming.impl.SerialContext.getProviderCacheKey（SerialContext.java:354） at com.sun.enterprise.naming.impl.SerialContext.getRemoteProvider（SerialContext.java:384） at com.sun.enterprise.naming.impl.SerialContext.getProvider（SerialContext.java:329）在com.sun.enterprise.naming.impl.SerialContext.lookup（SerialContext.java:477） at com.sun.enterprise.naming.impl.SerialContext.lookup（SerialContext.java:438）在javax.naming.InitialContext.lookup（InitialContext.java:417）在com.java.client.MyClient.main（MyClient.java:30）线程“main”中的异常javax.naming.NamingException：SerialContext中的'java：global / EJBDemo2EAR / EJBDemo2 / CalculatorImpl！com.java.stateless.Calculator'查找失败[myEnv = {org.omg.CORBA.ORBInitialPort = 3700， java.naming.factory.initial = com.sun.enterprise.naming.SerialInitContextFactory，org.omg.CORBA.ORBInitialHost = localhost，java.naming.factory.url.pkgs = com.sun.enterprise.naming，java.naming。 factory.state = com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl} [root异常是javax.naming.NamingException：无法为SerialContext获取SerialContextProvider [myEnv = {org.omg.CORBA.ORBInitialPort = 3700， java.naming.factory.initial = com.sun.enterprise.naming.SerialInitContextFactory，org.omg.CORBA.ORBInitialHost = localhost，java.naming.factory.url.pkgs = com.sun.enterprise.naming，java.naming。 factory.state = com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl} [Root exception is java.lang.NullPointerException]] 在com.sun.enterprise.naming.impl.SerialContext.lookup

Answer 1

在context.lookup中只传递完全限定的接口名称：

client.cart=(ShoppingCart)context.lookup("com.java.stateless.Calculator");

抛出nullpointerexception的EJB远程客户端：无法获取SerialContextProvider

1 个答案: