Spring Autowire resolution mechanism doesn't work with generic covariance [SPR-15855]

lhbaccount opened SPR-15855 and commented

GenericTypeAwareAutowireCandidateResolver doesn't work with generic covariance

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Affects: 4.3.10

Comment From: spring-projects-issues

Juergen Hoeller commented

Could you sketch a sample here? Just wondering what kind of covariance you would be using...

Comment From: spring-projects-issues

lhbaccount commented

https://github.com/sl-wxx/spring-framework-issues/tree/master/SPR-15855

This is a sample.

Comment From: spring-projects-issues

Yanming Zhou commented

Java doesn't supports such generic covariance

List<java.lang.reflect.Executable> list = new ArrayList<java.lang.reflect.Method>();  //compile error

Comment From: spring-projects-issues

Juergen Hoeller commented

We're strictly following Java semantics there, so indeed: If the corresponding assignment is rejected by the Java compiler, it will have to be rejected by Spring's type matching as well.