Just a try, but did you try putting any @Nullable annotation on the field?
On Jan 12, 2011, at 2:46 AM, Ambience wrote:
> I need to inject a field only if it is available in the current scope,
> and null otherwise. For example:
>
> public class Thinger implements Provider<SomeSuch> {
> public @Inject(optional=true) HttpServletRequest request;
>
> public SomeSuch get() {
> return request == null ? new WhosIt() : WhatsIt();
> }
> }
> However, if HttpServletRequest is bound (which it is) but not in
> scope, I get a ProvisioningException. I have not been able to find an
> elegant way to do this so I am relegated to do something like.
>
> HttpServletRequest request = null;
> try {
> request = injector.getInstance(HttpServletRequest.class);
> } catch(ProvisioningException e) {}
>
> Which just feels all manner of wrong. Is there a proper way to do this?
>
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