One thing behaved strangely after I migrated my code to Seam 2.0 CVS. Say there
is code like this:
| @Stateful
| @Scope(CONVERSATION)
| @Name("strange")
| public class StrangeBacking implements Serializable, Strange{
| @In EntityManager em;
| private List<Something> somethings;
|
| // getter and setter of somethings
|
| public void action1(){
| this.somethings = em.createQuery("...").getResultList();
| }
|
| public void action2(){
| this.somethings = null;
| }
|
| public void action3(){
| // the code does not touch the list somethings;
| }
| }
|
|
In the test.xhtml, there's something like this:
|
| ...
| <h:commandButton action="#{strange.action1}", value="action 1",
type="submit" />
|
| ...
| <h:commandButton action="#{strange.action2}", value="action 2",
type="submit" />
|
| ...
| <s:button action="#{strange.action3}", value="action 3" />
| <h:form rendered="#{strange.somethings == null}">
| ...
| </h:form>
|
Prior to the migration the form was successfully rendered after clicking the
buttons in this sequence: action 1 --> action 2 --> action 3. But today it does
not work. I used SeamTest to see if the list somethings was really nulled out
in the method action2(), the test passed. But when I looked into the seam debug
page, "somethings" always happily sat in the conversation context, not nulled
out!?
My current fix was like this:
| public void action2(){
| this.somethings.clear();
| }
|
| and in the test.xhtml:
|
| <h:form rendered="#{empty strange.somethings}">
| ...
| </h:form>
|
Then the form got rendered. But I do not understand this. Why the list
somethings in the conversation context cannot be nulled out but can be cleared
out? Any enlightenment would be highly appreciated!
Regards,
Ellen
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