Injection issue

[monkeyden]

Can anyone tell me why this doesn't work?

Injector:

@In(required = false, create = true)
@Out(required = false, scope = SESSION)
private DefaultPaginator paginator;

@Factory("paginator")
public void loadDefaultPaginator() {
 System.out.println("Loaded the paginator");
 paginator = (DefaultPaginator) Component.getInstance("paginator");
}

Injectee:

@Name("paginator")
@Scope(SESSION)
public class DefaultPaginator implements Paginator {
 public DefaultPaginator() {}
}

I get hundreds of the System.out message before it finally dies with a StackOverflowError.

[christian.bauer]

The @Factory method is not necessary. And I don't think what you think it does is what it is actually for.

[monkeyden]

The @Factory method is not necessary.

This was the next thing I tried after normal @In(create=true) didn't work.

And I don't think what you think it does is what it is actually for.

Care to enlighten me? Given the definition below, I thought I was using it correctly.

Marks a method as a factory method for a context variable. A factory method is called whenever no value is bound to the named context variable, and is expected to initialize the value of the context variable.

[pmuir]

At the very least you are confusing Seam by providing two ways to initialise your paginator (a component and a factory). required=false,create=true doesn't make sense to me

[monkeyden]

Given that the component does not exist on first access, I would like it to be created, injected and save it to session. So how do you suggest it be annotated? The component itself looks correct, I assume.

[pmuir]

@In(create=true) - if it does exist in scope it will be injected, if it doesn't exist it will be created and injected

[monkeyden]

Yeah, I tried that. It didn't work, which is what made me wonder about the requirements of the injected component. I always thought that the injected component just needed a @Name and a no-arg constructor, and Seam would handle the rest (Component.getInstance, I presume).

Caused by: org.jboss.seam.RequiredException: In attribute requires value for component: advancedSearchAction.paginator

[monkeyden]

Can someone at least confirm that these are the base requirements to be able to inject a component? A simple JavaBean should work shouldn't it? The tutorial doesn't explicitly say what is necessary, and my bean doesn't appear to be any different than what I've seen injected in there.

[anescu]

Hi,

I got the same error.
If I put just

@In(create = true)
UserHome lastUpdatedBy;

I get an exception about not-null value for that component (when some other's component list is called - a component reffering the first one)
If I put

@In(required = false, create = true)
UserHome lastUpdatedBy;

I get an exception latter when I try to "add" a new object.
More specific in the wire() method lastUpdatedBy is null and I get a NullPointerException.