Ebean and CDI

Pavel Arnošt

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May 6, 2012, 6:01:34 PM5/6/12

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Hi,

would it be difficult to add Contexts and Dependency Injection (CDI - JSR 299) support to Ebean? I looked at Struts2 CDI plugin and it seems quite simple:

http://svn.apache.org/viewvc/struts/struts2/trunk/plugins/cdi/src/main/java/org/apache/struts2/cdi/CdiObjectFactory.java?revision=1294420&view=markup

Process is described at http://docs.jboss.org/weld/reference/latest/en-US/html/extend.html, in sections 16.4 there is an short example.

Is there some type of factory in Ebean that can be extended?

Regards,

Pavel Arnost

Josh Kamau

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May 6, 2012, 6:10:44 PM5/6/12

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Am already using Ebean in a CDI environment ... I just call Ebean.someMethod() ... And it just works.

Josh.

Rob Bygrave

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May 6, 2012, 9:58:20 PM5/6/12

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I'm pretty sure he wants to inject a EbeanServer instance rather than use the Ebean singleton.

Pavel, have a look at the Ebean spring integration. Yes there is a EbeanServerFactory that creates EbeanServer instances.

Cheers, Rob.

Pavel Arnošt

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May 7, 2012, 4:04:56 AM5/7/12

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Hi,

thanks for replies. I have meant injecting domain/entity beans that EbeanServer returns, e.g. I would like to inject instances of class User with MailService ApplicationScoped bean.

Regards,

Pavel

Rob Bygrave

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May 7, 2012, 4:21:11 AM5/7/12

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To clarify, do you mean injecting an application scoped bean (MailService) into a domain/entity bean (User) ... so mailService is a transient field of the User entity bean?

Pavel Arnošt

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May 7, 2012, 6:31:57 AM5/7/12

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Yes, exactly.

edge

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May 7, 2012, 6:41:45 AM5/7/12

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I wouldn't recommend injecting application beans into entities - rather use services to manipulate your beans.

There is no really nice way of injecting beans into you entities as Ebean is creating them - you can of course use an AOP (e.g. AspectJ) to do this but again from experience I wouldn't recommend it.

On Monday, May 7, 2012 12:31:57 PM UTC+2, Pavel Arnošt wrote:

Yes, exactly.

Pavel Arnošt

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May 10, 2012, 10:46:28 AM5/10/12

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I used AspectJ weaving with Spring's @Configurable annotation in the past occasionally and I would like to try CDI as more "standard" approach. Because I have found more discouraging posts about injecting entities with application beans, I will not go against the flow and I will use other objects for injections. Thanks for making it more clear to me.