[JBoss Seam] - Tutorial Feedback
by ptmain
These are questions I have regarding the tutorial. They may be answered later in the tutorial (in fact I know some of the answers now), but they caused confusion for me while I read the tutorial because they were unclear at that time.
Although I'd like to get answers in this forum, my goal was to give you some feedback on the tutorial document from someone with no JSF/EJB3/Seam experience.
Section numbers are from the PDF version of the "Reference Manual" with the tutorial embedded in it.
Section 1.2.2 ("How it works") I'm confused about the initial rendering of the register.jsp page. What is the entry point? That is, the index.html forwards (redirects?) to a "register.seam" url. How does it know to render/display the JSP file? Does it just look for a jsp with the same name? (I can't find any references to "register.jsp" in any files in the project, so I'm assuming it's magic.) If I had wanted to go to a java bean first, before displaying the JSP, what url would I have put in the index.html file.
Section 1.4 (ToDo list) I'm just generally confused about how the jsp gets the correct set of tasks from the list of tasks. There seems to be some magical component named "taskInstanceList" that isn't referenced anywhere in the code except for the todo.jsp file. It somehow has a list of only the "todo" tasks, but what would happen if there are other process definitions? For example, the login.java login() method goes directly to the todo.jsp page, without any reference to a particular process definition. Then the jsp page grabs what appears to be the list of all tasks...
Also, the "update" action referenced from the JSP - what's up with that? Is that a magic action? Is it just refreshing the jsp page or is there something else happening?
Incidently, it's annoying that the previously added todo item stays in the input field. While I can see why that happens, I presume that since I'm not using an instance variable on my action bean I can't set it to null after the "createTodo()" method.
Sigh - I assume that all this will be cleared up in later examples - I'm just frustrated by the unkowns.
Section 1.5 - I noticed that I can submit the page by hitting the enter key but it just reloads the page. Interestingly, it sort of submits the form, as it updates the "higher/lower" display. However, it doesn't update the other messages or the number of guesses remaining. I think that means that it's updating my bean's attributes based on the form inputs, but not calling the "guess" method. I assume there's a way in JSF/Seam to handle the form submission via the enter key, since it's a common feature of webapps.
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19 years, 9 months
[Installation, Configuration & Deployment] - multiple class loaders found for pkg
by rdoust
I am still trying to move an EAR which had successfully deployed in JBoss 4.0.1 to JBoss 4.0.4. The EAR contains a WAR and several JARs. I had problems getting the application to work until I found a post by Adrian Brock that explains how to use the pre-4.0.2 classloading configuration. The problem was that I was getting a ClassCastException when using the PortableRemoteObject.narrow method to retrieve a class that would allow access to an EJBHome object. After changing the configuration files to support the pre-4.0.2 classloading, I got past this problem. Now, however, I have a new problem when an EJB attempts to create an instance of a private inner class on initialization. It's getting a java.lang.IllegalAccessException, which to me, sounds like I have more class loading issues. I'm also seeing entries in server.log that say:
multiple class loaders found for pkg: [package name] when the EJB Jar file is deployed.
Is there anyplace that someone can direct me to where I can learn all that I need to know about class loading issues that result from deploying EARs, WARs, and JARs to an EJB container in the post 4.0.1 era?
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19 years, 9 months