Question

is there a way to use dependency injection to inject all available implementations of a specific interface in spring?

This is kind of the same thing as asked here for .NET.

Though my aim is to use @Autowired for this:

public class Foo{
  @Autowired
  private IDataCollector[] collectors;
}

Is this supported, would this require hacking or should I preferably use another component where all implementations of IDataCollector register themselve and use that accessor component with autowired instead of the array injection?

A reason I can think of why this may not be implemented per default may be, that it would also inject possible mock implementations where inappropriate. Though I m still interested wether this is possible or not. :)

Answer 1

Your example should work fine, as should List<IDataCollector>. Did you give it a try before asking, and found it didn t work?

https://docs.spring.io/spring/docs/current/spring-framework-reference/core.html#beans-autowired-annotation

It is also possible to provide all beans of a particular type from the ApplicationContext by adding the annotation to a field or method that expects an array of that type.

Answer 2

you can inject a List and Spring will convert this for you:

<util:list id="collectors">
  <value>someone@something.com</value>
  <value>someoneelse@something.com</value>
</util:list>

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