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Re: [cdi-dev] Guice to CDI migration
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----- Original Message -----
> From: "Amit MENDAPARA - Axelor" <amit@xxxxxxxxxx>
> To: "cdi developer discussions" <cdi-dev@xxxxxxxxxxx>
> Sent: Friday, March 27, 2020 8:27:01 AM
> Subject: Re: [cdi-dev] Guice to CDI migration
>
> Hi all,
>
> So finally I made some progress in my efforts to migrate from guice to cdi. I
> choose to use weld-servlet, resteasy and narayana-jta and integrated it with
> embedded tomcat. Most of the cases are resolved but one where I need to run
> some initialization steps when application starts and it requires
> transaction.
>
> Can someone point me how this can be done? I have tried `@Observes
> @Initialized(ApplicationScoped.class) ServletContext context` event but here
> transaction manager is still not available.
Observing @Initialized(ApplicationScoped.class) is a correct way to perform something once the app is started.
What do you mean by "transaction manager is still not available"? How are you obtaining that and what exception are you seeing?
>
> For a context,
>
> There is an `EntityManagerProducer` that produces `RequestScoped`
> EntityManager.
> There is an implementation of `TransactionServices` as per weld standalone
> quickstart example.
>
> With Guice, we did this with a special eager singleton Servlet and overriding
> it's `init` method.
>
> Regards
> --
> Amit Mendapara
>
>
> On Thu, Mar 12, 2020 at 12:28 AM Emily Jiang < emijiang6@xxxxxxxxxxxxxx >
> wrote:
>
>
>
> Glad it works for you Amit! You are welcome! +1 on the blog idea from Reza!
>
> Thanks
> Emily
>
> On Wed, Mar 11, 2020 at 3:27 PM Amit MENDAPARA - Axelor < amit@xxxxxxxxxx >
> wrote:
>
>
>
> Hi all,
>
> So finally after going through CDI docs (Weld documentation), I gave it a try
> and found that `@Specializes` is the exact replacement for Guice linked
> binding. However, `@Alternative` with `@Priority` can do the same and we can
> have much better control. So that's a better option. Thanks Emily, Matej for
> the hints.
>
> Regards
> --
> Amit Mendapara
>
> Axelor India
> 604, Luxuria Business Hub,
> Near V. R. Mall, Dumas Road,
> Surat - 395007 (India)
> Phone: (+91) 261 297 7840
>
>
> On Wed, Mar 11, 2020 at 8:34 PM Amit MENDAPARA - Axelor < amit@xxxxxxxxxx >
> wrote:
>
>
>
> Thanks Reza,
>
> You are the motivation I am here on this mailing list to discuss this
> migration and I think it can be a good case study for others too. I will
> share my experience for sure. Thank you again.
>
> Regards
> --
> Amit Mendapara
>
> Axelor India
> 604, Luxuria Business Hub,
> Near V. R. Mall, Dumas Road,
> Surat - 395007 (India)
> Phone: (+91) 261 297 7840
>
>
> On Wed, Mar 11, 2020 at 8:28 PM reza_rahman < reza_rahman@xxxxxxxxx > wrote:
>
>
>
> Just a small suggestion - it would be awesome if after the migration is done,
> you could consider writing a blog entry on it. I believe it would be highly
> appreciated in the community. If you gave me a heads up, I would be
> delighted to spread the word on it.
>
> Reza Rahman
> Jakarta EE Ambassador, Author, Blogger, Speaker
>
> Please note views expressed here are my own as an individual community member
> and do not reflect the views of my employer.
>
> Sent via the Samsung Galaxy S7, an AT&T 4G LTE smartphone
>
>
> -------- Original message --------
> From: Amit MENDAPARA - Axelor < amit@xxxxxxxxxx >
> Date: 3/11/20 1:38 AM (GMT-05:00)
> To: cdi developer discussions < cdi-dev@xxxxxxxxxxx >
> Subject: Re: [cdi-dev] Guice to CDI migration
>
> Hi Emily,
>
>
>
>
>
>
> I have tried using "@Alternative" but I have to use qualifiers to inject this
> alternative. Is there any way we can make the CDI container use the
> "EnhancedGreetingServiceImpl" automatically without any qualifiers (without
> any changes in module-a or app itself).
> I don't think you need to use any qualifier here. You need to use `@Priority`
> to enable the alternative. The other way to completely override a bean, you
> can use `@Specializes`. By the way, I am not 100% sure what your use case
> is. A working example helps if you need further assistance.
>
>
> I never used CDI before so it's new to me and I don't know many of it's
> concepts (I know guice very well so at least DI and AOP concepts might be
> similar). So I will try your suggestion but on twitter one user recommended
> me to check `@Specializes` and that seems the proper solution as per it's
> javadoc.
>
> The project I am going to migrate is relatively complex and there are few
> more cases I would like to discuss here. I will try to provide a test case
> example that covers some of them.
>
> Regards
> --
> Amit Mendapara
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>
> --
> Thanks
> Emily
>
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