Equivalent of javax.enterprise.inject.Instance in Spring Boot for dynamic injection

Question

I'm migrating code from JEE to SpringBoot. I was using cool dynamic injection in JEE with javax.enterprise.inject.Instance class:

Just annotating:

@Inject
private Instance<CCIntentHandler> allMycandidates;

Will make allMycandidates be filled with all classes inheriting CCIntentHandler interface in my classpath which then I can iterate simply with:

Iterator<CCIntentHandler> iterator = allMycandidates.iterator()

Nothing more needed. How can I achieve this in Spring Boot?

Thanks

Answer 1

Spring will inject all instances of Foo if you @Autowire a List<Foo>.

So, the Spring equivalent of ...

@Inject
private Instance<CCIntentHandler> allMycandidates;

... is:

@Autowire
private List<CCIntentHandler> allMycandidates;

Update 1 in response to this comment:

Do CCIntentHandler interface or classes implementing this interface need any Spring annotations?

Spring must be aware of any instances of CCIntentHandler, this could achieved as follows:

• Annotate each class implementing CCIntentHandler with @Component and ensure that these classes are scanned by Spring Boot

Or

• Provide a public method to return each class implementing CCIntentHandler and annotate each of these public methods with @Bean and ensure that the class which contains these public methods is annotated with @Configuration and that this configuration class is scanned by Spring Boot.

More details on bean declaration and dependency injection in the docs.