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Java Forum / JavaBeans / November 2004Passing an instance of a Bean between JSP pages
Hi, I have made a shopping cart stateful session bean. In one JSP page, it simply adds some strings to the vector in the cart bean. I want to be able to click on a link to another page, which can then retrieve those strings. I have been trying to read up on doing this, but can't quite figure it out from what I have read. Below is the code which I use to create an instance of the Cart. How do I retrieve this instance from another JSP page. Do I need to call request.getSomethingOrOther, or do I need to do something with the SessionContext. I am comfused. Any help would be great. Cheers, David System.setProperty("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory"); System.setProperty("java.naming.provider.url", "localhost:1099"); Object reference = null; try{ InitialContext jndiContext = new InitialContext(); reference = jndiContext.lookup("y0210323/Cart"); } catch(NamingException e){e.printStackTrace();} try{ CartRemoteHome home = (CartRemoteHome)PortableRemoteObject.narrow(reference, CartRemoteHome.class); CartRemote shoppingCart = home.create("Duke DeEarl","123"); .........................etc > Hi, I have made a shopping cart stateful session bean. In one JSP > page, it simply adds some strings to the vector in the cart bean. I [quoted text clipped - 7 lines] > do something with the SessionContext. I am comfused. Any help would be > great. You need to pass the EJB reference to the next page, which is typically achieved by storing it in the (HTTP) session on the first page and then retrieving it from there on the second. This scales poorly compared with alternatives, however (see my response to your other question); a stateful session bean is not really the right tool for the job. John Bollinger jobollin@indiana.edu > You need to pass the EJB reference to the next page, which is typically > achieved by storing it in the (HTTP) session on the first page and then [quoted text clipped - 4 lines] > John Bollinger > jobollin@indiana.edu Unfortunately I am doing a degree and a unit requires me to implement a sales system using EJB's, so I have no choice in the technology I can use. I know how to pass objects from page to page using the HTTP session, however I am having difficulty in figuring out how to get the reference to the instance of my session bean. From what I can find it seems that I need to call getEJBObject() on the SessionContext? So in my JSP that wants to retrieve the instance I call: CartRemote cart = (CartRemote) request.getSessionContext().getEJBObject(); Is this right? I can't currently test it because the server has gone down, so any insight into whether this would be correct would be great. Cheers, David >>You need to pass the EJB reference to the next page, which is typically >>achieved by storing it in the (HTTP) session on the first page and then [quoted text clipped - 10 lines] > session, however I am having difficulty in figuring out how to get the > reference to the instance of my session bean. One of the alternatives I suggested was to use a _stateless_ session bean or entity bean to access cart information stored in a backend database (instead of trying to keep the cart information in the conversational state of a stateful session bean). That would be an EJB-based solution, would it not? Furthermore, EJB is completely unsuited to be the primary technology for any UI, so you must be using other technologies than just EJB anyway. For a web-based UI you are going to have to use servlets / JSP, and you are going to want to use session-scope data to thread together a user session with your application, even if the only such data is EJB references. The question is how much information you will maintain there, and how much you maintain on the other side of your EJBs -- not whether you use servlet-style session-scope data in the first place. As for the reference, you already have it. It is the value that you get back from the create() method of your local home interface; you surely store it in some variable typed as the bean's local interface. John Bollinger jobollin@indiana.edu > You need to pass the EJB reference to the next page, which is typically > achieved by storing it in the (HTTP) session on the first page and then [quoted text clipped - 4 lines] > John Bollinger > jobollin@indiana.edu Unfortunately I am doing a degree and a unit requires me to implement a sales system using EJB's, so I have no choice in the technology I can use. I know how to pass objects from page to page using the HTTP session, however I am having difficulty in figuring out how to get the reference to the instance of my session bean. From what I can find it seems that I need to call getEJBObject() on the SessionContext? So in my JSP that wants to retrieve the instance I call: CartRemote cart = (CartRemote) request.getSessionContext().getEJBObject(); Is this right? I can't currently test it because the server has gone down, so any insight into whether this would be correct would be great. Cheers, David Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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