Why use the @In annotion?

[c_eric_ray]

I'm working through the SEAM tutorial and it makes pretty good since, but I have this one question. What is the purpose of doing this...

@In
private MyObject mo;

versus just

private MyObject mo;

Thanks,
Eric

[pmuir]

Have you read http://docs.jboss.com/seam/1.0.1.GA/reference/en/html/concepts.html#d0e2511 and the examples in Chapter 1?

For your example, a JSF input component with a value="#{mo}" would have the value entered by the user injected into your backing bean.

[c_eric_ray]

Yes, I've read through the documentation, those sections in particular I have read several times.

I thought JSF did that for you automatically, through binding. So

<h:inputText value=#{mo.field}>

binds the value enterd by the user in the backing bean variable.

I still don't understand the why about using @In or not using it. I guess I don't understand what using @In does over binding JSF data to beans. Is there a difference? Or is this just how SEAM does the same thing to add more Contexts.

Thanks again,
Eric

[gavin.king]

JSF automatically binds form fields to objects.

It does not automatically wire together managed bean components, unless you tell it to.

You use @In to wire components together. This is quite different to binding form data to a component.

[c_eric_ray]

I see. This then replaces the managed bean configuration in the faces-config.xml file. Excellent. Thanks all.

Eric