Jersey 2.26+: configure() not called after converting HK2's Factory to Supplier

Question

For simplifying our web services I'd like to introduce a custom MyObj class using the Jersey framework in version 2.34 and want to inject the created instances via the @Context annotation.

I have two questions:

1. Assuming a web service method @GET test(@Context MyObj obj), how can I control when instances of MyObj are created in respect to the execution of existing servlet request filters?

2. To create instances of MyObj, I already have a working example based on HK2's Factory's (see below). Since I observed that my factory class gets instantiated twice, and Jersey 2.26+ recomments to use the newer approach based on Supplier's, I tried to convert my example. Unfortunately, configure() won't be called in the provided Binder implements Supplier class, and thus, no objects get created. How can I get this working? (Btw., In both cases, Binder and BinderHK are registered via jersey.config.server.provider.classnames in my web.xml.)

Thank you for any help.

Working HK2 Factory example:

public class MyObjHK {}

import org.glassfish.hk2.utilities.binding.AbstractBinder;
import org.glassfish.jersey.process.internal.RequestScoped;
public class BinderHK
extends AbstractBinder {
    @Override protected void configure() {
        bindFactory(MyObjFactoryHK.class).to(MyObjHK.class).in(RequestScoped.class);
    }
}

import org.glassfish.hk2.api.Factory;
public class MyObjFactoryHK
implements Factory<MyObjHK> {
    @Override public MyObjHK provide() {return new MyObjHK();} // ok
    @Override public void dispose(MyObjHK instance) {};
}

public class API_HK2 {
    @GET
    public static Response myobjhk(@Context MyObjHK obj) {
        System.out.println("called hk, obj="+obj); // ok
        return Response.ok().build();
    }
}

Not working Supplier example:

public class MyObj {}

import org.glassfish.jersey.internal.inject.AbstractBinder;
import org.glassfish.jersey.process.internal.RequestScoped;
public class Binder
extends AbstractBinder {
    @Override protected void configure() { // not called ???
        bindFactory(MyObjFactory.class).to(MyObj.class).in(RequestScoped.class);
    }
}

import java.util.function.Supplier;
public class MyObjFactory
implements Supplier<MyObj> { 
    @Override public MyObj get() {return new MyObj();}
}

public class API {
    @GET
    public static Response myobj(@Context MyObj obj) {
        System.out.println("called, obj="+obj); // null ???
        return Response.ok().build();
    }
}

Answer 1

The binder isn't something that can be registered with the jersey.config..classnames init-param. You need to either register it with a ResourceConfig or with Feature (and register the Feature with the init-param)

@Provider
public class MyFeature implements Feature {
    @Override
    pubic boolean configure(FeatureContext ctx) {
        ctx.register(new MyBinder());
        return true;
    }
}