@Property annotation to "autowire" properties [SPR-5659]

[spring-projects-issues]

Bruno Navert opened SPR-5659 and commented

We (Morgan Stanley) have developed code to support a new annotation, similar to @Autowired: @Property
This, combined with a BeanPostProcessor instance, will inject property values into fields/setters automatically, as if the bean had been registered in XML with ${xxx} placeholders.

The code uses a PropertyPlaceholderConfigurer subclass to be able to programmatively get the value of a given property name, using the same logic of system property override/fallback.

Benefits are clear: beans can then be annotated with @Component, and there's no need to define them in XML anymore when they depend on a property. Without this, @Autowired takes care of all the dependencies, but the moment you need a property, you still need to define your bean in XML in order to use the ${xxx} placeholder syntax. With this new annotation, everything can be done through code.

Since this code is very generic, we feel it would be best to be integrated into the core Spring framework.

Code will be attached to this JIRA issue as soon as we get legal approval internally to share it.

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Affects: 2.5.4

1 votes, 2 watchers

[spring-projects-issues]

Juergen Hoeller commented

This sounds very similar to our new @Value annotation in Spring 3.0, in particular now in the upcoming 3.0 M3 where @Value values support not only #{...} expressions but ${...} placeholders as well. Please have a look at M3 once it's out early next week. If this is basically what you had in mind, then let's further refine @Value if you encounter any gaps.

Juergen

[spring-projects-issues]

Bruno Navert commented

Thanks, I'll take a look next week and update this Jira then.

[spring-projects-issues]

Juergen Hoeller commented

FYI, 3.0 M3 will be going out around SpringOne Europe (next week) now.

For the time being, I assume that @Value does the job for you as of M3. Let's reopen this issue if that turns out not to be the case.

Juergen

[spring-projects-issues]

Ricardo Gladwell commented

Created a project to support configuration property injection for Spring 2.5+:

https://code.google.com/p/spring-property-annotations/