3 Replies Latest reply on Jan 6, 2012 6:44 AM by prasad.deshpande

    As7 HelloWorld Problem lookup Exception

    leafjungle
    leafjungle Jan 5, 2012 11:13 PM

      Hello, I am a new commer to EJB 3.0 and Jboss.

      I write the following code:

       

      Header 1Header 2

      Cart.java

      -------------------------------------------------------

      package com.lijun.ejb.cart;

       

       

      import java.io.Serializable;

      import java.util.List;

       

       

      public interface Cart extends Serializable {

                public void addItem(String productName);

       

                public List<String> getALlItems();

      }

      CartBean.java

      -------------------------------------------------------------------------------------------------------------------------------------

      package com.lijun.ejb.cart;

       

       

      import java.util.ArrayList;

      import java.util.List;

       

       

      import javax.ejb.Remote;

      import javax.ejb.Stateful;

       

       

      @Stateful

      @Remote({Cart.class})

      public class CartBean implements Cart {

                private static final long serialVersionUID = 3813488272549276156L;

                private List<String> itemList=new ArrayList<String>();

       

                @Override

                public void addItem(String productName) {

                          this.itemList.add(productName);

                }

       

       

                @Override

                public List<String> getALlItems() {

                          return this.itemList;

                }

       

       

      }


      test.jsp

      -----------------------------------------------------------------------------------------------------------------------------------------------

      <%@ page language="java" pageEncoding="UTF-8"%>

      <%@ page import="com.lijun.ejb.cart.*,javax.naming.*,java.util.*" %>

      <%

      String path = request.getContextPath();

      String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

      %>

       

       

      <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

      <html>

        <head>

          <base href="<%=basePath%>">

          <title>Hello World</title>

        </head>

        <body>

          <%

                    out.println("welcome to beijing<br/>");

                    try{

                              out.println("no exception....<br/>");

                              InitialContext ctx=new InitialContext();

                              Cart cart=(Cart)session.getAttribute("cart");

                              if(cart==null){

                                        out.println("cart is null, now create....<br/>");

                                        cart=(CartBean)ctx.lookup("CartBean/remote");

                                        session.setAttribute("cart",cart);

                              }

                              out.println("add to cart.....<br/>");

                              long x=Math.round(Math.random()*100);

                              cart.addItem("C++ Primer "+x);

         

                              out.println("all item list......<br/>");

                              List<String> allItems=cart.getALlItems();

                              out.println("item list:<br/>");

                              int index=1;

                              for(String name:allItems){

                                        out.println(index+"          "+name+"<br/>");

                              }

                    }catch(Exception e){

                              out.println("exception....");

                              out.println(e.getMessage());

                              out.println(e.getStackTrace().toString());

                    }

          %>

        </body>

      </html>

       

      And I run JBosss 7:

      http://localhost:8080/EjbProject3/test.jsp

      The result is:

      welcome to beijing

      no exception....

      cart is null, now create....

      exception.... CartBean/remote -- service jboss.naming.context.java.CartBean.remote [Ljava.lang.StackTraceElement;@13b8479

       

      It means that when lookup, exception occurs.

      What's the problem?