[jboss-user] [JBoss Seam] - @Out-jection fails to work in certain conditions - Beware!
Hi,
This is an interesting example and I would be grateful if anyone could shed some light on
this extremely strange behaviour.
It seems that in the following example, if an item is an @Entity Pojo on an action class
and the entity manager is @In-jected to the same action class (you don't have to use
it) then @Out-jection will fail.
The following simple example will illustrate.
This simple page will display the value of an item if the item is not null
| <body>
| <f:view>
| <h:form>
| <div><h:commandLink value="New Item"
action="#{testPage.newItem}" /></div>
| <s:div rendered="#{testPage.item != null}">
| #{testPage.item.name}
| </s:div>
| <h:commandLink value="Clear Item"
action="#{testPage.clearItem}" />
| </h:form>
| </f:view>
| </body>
|
The testPage action class is as follows
| @Name("testPage")
| @Scope(ScopeType.CONVERSATION)
| public class TestPageAction {
|
| @In EntityManager entityManager;
|
| private Item item;
|
| public Item getItem() {
| return item;
| }
|
| public void setItem(Item item) {
| this.item = item;
| }
|
| @Create
| @Begin(join=true)
| public void newItem() {
| item = new Item();
| item.setName("some item");
| }
|
| public void clearItem() {
| item = null;
| }
| }
|
Item is as follows
| @Entity
| public class Item {
|
| @Id
| @GeneratedValue
| private long id;
|
| private String name;
|
| public String getName() {
| return name;
| }
|
| public void setName(String name) {
| this.name = name;
| }
|
| public long getId() {
| return id;
| }
|
| public void setId(long id) {
| this.id = id;
| }
| }
|
Now this example will fail to remove the item text when you click the Clear Item link and
it seems it is because the outjection failed to outject a null value for the item.
Now the interesting this is if you do ANY of the following the example will work:
1. Change item to a non @Entity pojo - example works or
2. Comment out the injection of the EntityManager - example works
Can anyone shed some light on this? I've spent a lot of time stepping through the seam
source and even though after the invoke of the action method the item is set to null it
mysteriously gets reset back to a value before outjection occurs.
Any help would be appreciated
Thanks
Troy
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