public abstract class A {
    @Inject
    private HelperA ha;

    public void handle() {
        ha.handle();
        childHandle();
        //
    }

    public abstract void childHandle();
}

public class B extends A {
    @Inject
    private HalperB hb;

    @Override
    public void childHandle() {
        //
    }
}

public class C extends A {
    @Inject
    private HalperC hc;

    @Override
    public void childHandle() {
        //
    }
}