I want to use the @ViewScoped - scope in my application for the backing beans of some web pages. Also I use CDI to inject the dependecies into the backing beans.
However, when I use a backing bean annotated like this
@ManagedBean
@ViewScoped
@Inject
someDependency (...)
the @Inject annotation will not inject anything and i get a NullPointerException as soon as i am accessing the dependency.
However, when I decorate the backing bean with
@Named
@ViewScoped
@Inject
someDependency (...)
the injection works fine, but now the @ViewScoped is ignored as it is not part of CDI / Weld.
How can I use @ViewScoped together with CDI Weld?
Answer
The problem is that you are mixing simple managed beans with CDI managed beans and they don't work together. Managed Beans is a simple framework for defining beans and their injected beans. CDI is a separate beast with all sorts of extra goodness.
However, Managed beans can't use CDI Injection points but can use the ViewScope while CDI beans use CDI injection points and all that good stuff but the ViewScope isn't available.
To resolve the issue you have to either go with CDI and use the Seam-Faces library to use view scope, or drop CDI and stick with simple managed beans which is a simple implementation.
Cheers,
Andy