Phil Webb opened SPR-13963 and commented

Upgrading Spring Boot to Framework to 4.3is not currently possible due to failure in EndpointAutoConfigurationTests.

It appears that this line in EndpointAutoConfiguration:

@Autowired(required = false)
private Map<String, HealthIndicator> healthIndicators = new HashMap<String, HealthIndicator>();

No longer works correctly as String values end up in the map.

I believe that commit 3f74a74481d is ultimately responsible as rolling this back seems to fix the issue.

Affects: 4.3 RC1

Issue Links:

• Allow for normal bean wiring semantics for types assignable to Map [SPR-7915] #12570 Allow for normal bean wiring semantics for types assignable to Map
• Self reference fallback in 4.3 is not meant to apply to collection elements [SPR-14965] #19532 Self reference fallback in 4.3 is not meant to apply to collection elements
• Can't autowire BiMap: container resolves non-matching Map of value beans [SPR-15117] #19684 Can't autowire BiMap: container resolves non-matching Map of value beans

Referenced from: commits 48ee9b5, 1b53edf