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User mentioned (1): @Configuration
User mentioned (0): @Autowired
User mentioned (0): @Component
Low reputation (0.5):

I would like to provide more clearance to your case

first as Cranic Cai pointed out that you should annotate you BaseConfig class with @Configuration annotation so that the spring will pickup and instantiate the object and injected it in Spring Context so you can @Autowired it in all other Spring Context object related.

second if you already directly instantiate a new object in the bean definition like this

@Bean
    @Primary
    RestTemplate restTemplate(@Autowired RestTemplateBuilder restTemplateBuilder) {
        return restTemplateBuilder.errorHandler(
new IPSRestErrorHandler() -> this is a new object will not be autowired from Spring Context
).build();
    }
}

it will not be autowired from your defined class component because you instantiate a new object here. if this is what you want then you can remove completely the @Component annotation from IPSRestErrorHandler class

public class IPSRestErrorHandler extends DefaultResponseErrorHandler { ... }

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