Re: [jakartabatch-dev] CDI based job instantiation

["Scott Kurz" <skurz@xxxxxxxxxx>]

Not sure what CDI mode you're using, but in Open Liberty, at least, you'd typically need to add a bean-defining annotation like @Dependent since batch artifacts aren't "specially" scanned automatically.
Wouldn't be surprised if JBeret is the same.

And yes, @Dependent is a bit weird since batch defines its own lifecycle for artifacts.. but CDI does fit in in a bit of a unique way.

------------------------------------------------------
Scott Kurz
WebSphere Batch and Developer Experience
skurz@xxxxxxxxxx
--------------------------------------------------------

Martijn Dashorst ---02/11/2020 09:44:12 AM---All, Not sure if this is the right list, but given my current experience, a

From: Martijn Dashorst <martijn.dashorst@xxxxxxxxx>
To: jakartabatch-dev@xxxxxxxxxxx
Date: 02/11/2020 09:44 AM
Subject: [EXTERNAL] [jakartabatch-dev] CDI based job instantiation
Sent by: jakartabatch-dev-bounces@xxxxxxxxxxx

---

All,

Not sure if this is the right list, but given my current experience, a batch job has some but not all capabilities of CDI injection at its disposal.

@Named
public class ExampleBatchlet extends AbstractBatchlet {
    @Inject
    private ExampleService service;

    @Override
    public String process() {
        service.doSomething(); // <-- NullPointerException
    }
}

@ApplicationScoped
public class ExampleService {
    public void doSomething() {}
}

This should IMO work, but my Jakarta Batch implementation, jberet, only injects artifacts that are JobContext, StepContext or BatchProperty [1]. 

Now this can be a bug in JBeret, or a bug in the specification, where it doesn't explicitly require full injectability of CDI beans. (The factory also doesn't take into account setter and constructor based injection).

Martijn


[1] https://github.com/jberet/jsr352/blob/master/jberet-core/src/main/java/org/jberet/creation/AbstractArtifactFactory.java#L67
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