On Sun, Apr 7, 2019 at 4:03 AM Christopher Dodunski <
chrisfromtapes...@christopher.net.nz> wrote:
> Hi team,
>
Hello!
> The slight hiccup is that this server endpoint (service) depends on
> another service, which I've tried injecting into a field of the endpoint
> class:
>
> @InjectService("VesselStateTracker")
>
Why not just @Inject? Do you have more than one service implementing
VesselStateTracker?
> private VesselStateTracker vesselStateTracker;
>
> The problem is that when Tomcat invokes this endpoint class, the injected
> service is not instantiated (makes sense, as Tapestry is configured to
> ignore calls to the endpoint). So a null pointer exception occurs as soon
> as the endpoint tries to use 'vesselStateTracker' internally.
I'm afraid you're wrong about why the problem is happening. Tapestry-IoC is
the one actually taking care of services and it knows nothing about ignored
paths, which are a Tapestry(-core, the webapp) thing. The problem is that
your endpoint doesn't seem to be a Tapestry-IoC service itself, so it
doesn't get any dependency injection done to it.
> In AppModule I've tried eagerly loading both services after binding them,
> and making the VesselStateTracker field a static field inside the
> endpoint, but this wasn't successful.
>
> Is there a simple solution or work-around to this almost expected problem?
>
I'd try, in your endpoint, to get the Tapestry-IoC registry object from the
ServletContext using the TapestryFilter.REGISTRY_CONTEXT_NAME
(org.apache.tapestry5.application-registry) key, then call
registry.getService(VesselStateTracker.class) on it.
>
> Thanks & regards,
>
> Chris.
>
>
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>
--
Thiago
