Hi,
I'm a newbie with Seam, but I've been having trouble with the DataModel
annotation. I'm not sure if it's a configuration problem, but I've used the
messages example in JBoss Seam 1.0.1 GA as a baseline for my configuration
(took many of the configuration values and jars from there). I'm trying to
upgrade a web app that currently runs on MyFaces 1.1.2, Tomahawk 1.1.2, and
Tomcat 5.5.15. I'm also using Tiles - in particular, with Tiles Support from
Tomahawk.
I haven't done anything fancy yet - I've just tried to modify a simple existing
page. Here's a snippet of code which I'm having problems with:
@Stateful
| @Scope(ScopeType.SESSION)
| @Name("statusData")
| public class StatusBean implements StatusLocal {
| @In
| private Context sessionContext;
|
| @DataModel
| private List status;
|
| @Factory("status")
| private void retrieveStatus() {
| // Bus. logic code - sets status...
| }
|
| @Remove @Destroy
| public void destroy() {
|
| }
| }
The interface only lists the destroy method...
@Local
| public interface StatusLocal {
| public void destroy();
| }
My JSP code attempts to get the DataModel from here...
<h:dataTable value="#{status}" var="varStatus"...
However, I get errors stating that it cannot evaluate the expression:
| ServletException ... .... Cannot get value for expression: #{status}
When I debug in Eclipse, I notice that the StatusBean class is never even
instantiated. Normally, one would think that there is a configuration problem.
However, if I change the bean code to:
@Stateful
| @Scope(ScopeType.SESSION)
| @Name("statusData")
| public class StatusBean implements StatusLocal {
| @In
| private Context sessionContext;
|
| private List myStatus = new ArrayList();
|
| public List getMyStatus() {
| return myStatus;
| }
|
| @Remove @Destroy
| public void destroy() {
|
| }
| }
and for the interface code is:
@Local
| public interface StatusLocal {
| public List getMyStatus();
| public void destroy();
| }
and the JSP is:
<h:dataTable value="#{statusData.myStatus}" var="varStatus"...
It works! When I debug from inside Eclipse, I see that the bean is
instantiated and the getter is called. I also see that the sessionContext
context variable is injected correctly. These two things lead me to believe
that my configuration is somewhat correct. I haven't tried any of the other
annotations and features of Seam, so I hope things aren't broken there either?
What am I doing wrong here? I would really appreciate any assistance, as I'm
pretty much stuck...
BTW, the messages example works within Tomcat 5.5.15 and if I replace the
MyFaces 1.1.3 libs with MyFaces 1.1.2 libs within the messages example, it
still works...
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