Can't inject a bean of a collection type [SPR-12412]

[spring-projects-issues]

Christopher Smith opened SPR-12412 and commented

I have a bean that takes as an optional autowired argument a Collection<String> of "interesting" keys to watch for. Spring has a hard assumption that this means that the DI container should collect beans of type String and autowire that; there's no way (at least in JavaConfig, and this looks to be a DI algorithm problem) to autowire a bean of type Collection<String>.

The specific error is

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [java.lang.String] found for dependency [collection of java.lang.String]

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Affects: 4.1.1

Reference URL: https://github.com/chrylis/SPR-12412

Issue Links:

• @Autowired does not work for target bean of type Collection [SPR-12180] #16794 @Autowired does not work for target bean of type Collection ("duplicates")

[spring-projects-issues]

Juergen Hoeller commented

This looks like a duplicate of #16794: See my comment there for workarounds, and let's continue the discussion there...

Juergen

[spring-projects-issues]

Christopher Smith commented

I do think this is a duplicate, I just couldn't find it with JIRA's special little search parameters.

[sbrannen]

If you have shown interest in this issue, you may also be interested in the following which is currently scheduled for inclusion in Spring Framework 6.1.

• Direct autowiring of existing collection subtype bean if ApplicationContext contains beans of type T #30022