Java EJB注入-JNDI查找失败

因此，我开始用Netbeans 8.2开发一个JavaEE企业应用程序。它是关于一个商店，你有一个购物车，你必须正确地存储每个客户的会话

在NetBeans中，我有：

shopejb

和

shopwar

Shop ejb

包含以下类：

• CartLocal.java

  package cart;
  
  @Local
  public interface CartLocal{
  }
  

  package cart;
  
  @Stateful
  @StatefulTimeout(unit = TimeUnit.MINUTES, value = 20)
  public class CartBean implements CartLocal{
  }
  

  import cart.CartLocal;
  import java.io.*;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  import javax.naming.InitialContext;
  import javax.naming.NamingException;
  import javax.servlet.*;
  import javax.servlet.annotation.WebServlet;
  import javax.servlet.http.*;
  
  @WebServlet(name = "Servlet", urlPatterns = {"/Servlet"})
  public class Servlet extends HttpServlet {
  
  private static final String CARRITO_SESSION_KEY = "shoppingCart";
  
  public Servlet() {
      super();
  }
  
  @Override
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
      CartLocal carrito = (CartLocal) request.getSession().getAttribute(CARRITO_SESSION_KEY);
  
      try {
          if (carrito == null) {
              InitialContext ic = new InitialContext();
              carrito = (CartLocal) ic.lookup("java:global/Shop/Shop-ejb/CartBean!cart.CartLocal");
  
              request.getSession().setAttribute(CARRITO_SESSION_KEY, carrito);
          }
      } catch (NamingException ex) {
          Logger.getLogger(Servlet.class.getName()).log(Level.SEVERE, null, ex);
      }
  }
  

• CartBean.java

  package cart;
  
  @Local
  public interface CartLocal{
  }
  

  package cart;
  
  @Stateful
  @StatefulTimeout(unit = TimeUnit.MINUTES, value = 20)
  public class CartBean implements CartLocal{
  }
  

  import cart.CartLocal;
  import java.io.*;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  import javax.naming.InitialContext;
  import javax.naming.NamingException;
  import javax.servlet.*;
  import javax.servlet.annotation.WebServlet;
  import javax.servlet.http.*;
  
  @WebServlet(name = "Servlet", urlPatterns = {"/Servlet"})
  public class Servlet extends HttpServlet {
  
  private static final String CARRITO_SESSION_KEY = "shoppingCart";
  
  public Servlet() {
      super();
  }
  
  @Override
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
      CartLocal carrito = (CartLocal) request.getSession().getAttribute(CARRITO_SESSION_KEY);
  
      try {
          if (carrito == null) {
              InitialContext ic = new InitialContext();
              carrito = (CartLocal) ic.lookup("java:global/Shop/Shop-ejb/CartBean!cart.CartLocal");
  
              request.getSession().setAttribute(CARRITO_SESSION_KEY, carrito);
          }
      } catch (NamingException ex) {
          Logger.getLogger(Servlet.class.getName()).log(Level.SEVERE, null, ex);
      }
  }
  

然后，

shopwar

包含以下servlet：

• Servlet.java

  package cart;
  
  @Local
  public interface CartLocal{
  }
  

  package cart;
  
  @Stateful
  @StatefulTimeout(unit = TimeUnit.MINUTES, value = 20)
  public class CartBean implements CartLocal{
  }
  

  import cart.CartLocal;
  import java.io.*;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  import javax.naming.InitialContext;
  import javax.naming.NamingException;
  import javax.servlet.*;
  import javax.servlet.annotation.WebServlet;
  import javax.servlet.http.*;
  
  @WebServlet(name = "Servlet", urlPatterns = {"/Servlet"})
  public class Servlet extends HttpServlet {
  
  private static final String CARRITO_SESSION_KEY = "shoppingCart";
  
  public Servlet() {
      super();
  }
  
  @Override
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
      CartLocal carrito = (CartLocal) request.getSession().getAttribute(CARRITO_SESSION_KEY);
  
      try {
          if (carrito == null) {
              InitialContext ic = new InitialContext();
              carrito = (CartLocal) ic.lookup("java:global/Shop/Shop-ejb/CartBean!cart.CartLocal");
  
              request.getSession().setAttribute(CARRITO_SESSION_KEY, carrito);
          }
      } catch (NamingException ex) {
          Logger.getLogger(Servlet.class.getName()).log(Level.SEVERE, null, ex);
      }
  }
  

我正在使用GlasshFish，当我访问

http://localhost:8080/Shop-war/Servlet

我在NetBeans控制台上遇到以下错误：

Grave:   javax.naming.NamingException: Lookup failed for 'java:global/Shop/Shop-ejb/CartBean!cart.CartLocal' in SerialContext[myEnv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialInitContextFactory, java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl, java.naming.factory.url.pkgs=com.sun.enterprise.naming} [Root exception is javax.naming.NameNotFoundException: Shop]

---

我知道

查找

失败，但我尝试了多种方法，但都没有结果。希望您能帮助我。

您需要在web.xml上设置一个

标记：

例如：

<ejb-local-ref>
        <ejb-ref-name>CartLocal</ejb-ref-name>
        <ejb-ref-type>Session</ejb-ref-type>
        <local>cat.CartLocal</local>
        <ejb-link>CartLocal</ejb-link>
</ejb-local-ref>

---

谢谢你的回答，修复了我的错误，但我不明白为什么这是有效的，而我的代码不是