MP-Config with EJB or CDI?

[Ralph Soika]

Hi,

I try to implement a custom Microprofile Config Source. My property source is some data stored in a database.

After some testing with Wildlfy 15 it seems that a custom config Source is not part of the CDI lifecylce.

I did not find a way to get a JPA Entity Manger or a EJB injected. It looks to me that the Custom Config Source is created as a plain old Java bean.

My question is: is this behavior expected or is this because of a wildfly specific implementation?

I found a similar unanswered question on Stackoverflow.  

Does anybody knows how to inject EJBs into a custom config source?

Thanks for help

===
Ralph

[Alasdair Nottingham]

I recall in the early days a lot of discussion around this area and they were made POJO’s because if an EJB (which is a CDI bean) expected config to be injected into it at startup based on a ConfigSource that had dependencies on EJB’s you could get into startup looping issues.

I guess you could use JNDI to look it up, but again it may not be available when the ConfigSource is first loaded.

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[Ralph Soika]

Thanks for that information, this makes sense.

I solved the problem by simply declaring my local properties object static. Now I can overload the properties later when my CDI/EJB code is @PostConstruct ed

This works! I added my code example here.

Am Freitag, 7. Juni 2019 17:54:22 UTC+2 schrieb Alasdair Nottingham:

I recall in the early days a lot of discussion around this area and they were made POJO’s because if an EJB (which is a CDI bean) expected config to be injected into it at startup based on a ConfigSource that had dependencies on EJB’s you could get into startup looping issues.

I guess you could use JNDI to look it up, but again it may not be available when the ConfigSource is first loaded.

On Jun 7, 2019, at 11:51 AM, Ralph Soika <ralph...@imixs.com> wrote:

Hi,

I try to implement a custom Microprofile Config Source. My property source is some data stored in a database.

After some testing with Wildlfy 15 it seems that a custom config Source is not part of the CDI lifecylce.

I did not find a way to get a JPA Entity Manger or a EJB injected. It looks to me that the Custom Config Source is created as a plain old Java bean.

My question is: is this behavior expected or is this because of a wildfly specific implementation?

I found a similar unanswered question on Stackoverflow.  

Does anybody knows how to inject EJBs into a custom config source?

Thanks for help

===
Ralph

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[Emily Jiang]

Thank you Ralph for sharing your experiment! Would you like to write a blog on this: your problem, your solution, your finding? We can get this published under microprofile.io. Thoughts?

Thanks

Emily

[Ralpus]

He Emily,

I have written a short Blog here: https://ralph.blog.imixs.com/2019/06/11/microprofile-customconfigsource-with-database/

Let me know what you think. You can share it if you like.

Best regards

Ralph

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[Phillip Krüger]

Hi Ralph

Also have a look at the DB Config Source in the MicroProfile-ext project:

https://github.com/microprofile-extensions/config-ext/tree/master/configsource-db

Cheers

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[Emily Jiang]

Thank you Ralph! I like your blog. Can you publish under microprofile.io/blog by clicking on "Become a MicroProfile Author" and then follow the instruction there?

Thanks

Emily

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[Rhuan Henrique]

Hi @Ralpus 

In your post the custom ConfigSource is a singleton EJB, but another way to do that is getting EntityManager programmatically or creatting a EJB separated from ConfigSource and getting this EJB programatically using CDI. Using CDI you can get using this code to getnEJB programmatically.

         javax.enterprise.inject.spi.CDI.current().select(Ejb.class).get();

Thank you for share your experience!

Rhuan Rocha

SouJava Rio

  

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