What is the BeanRegistrar contract introduced in Spring Framework 7?

BeanRegistrar is a new programmatic bean-registration contract added in Spring Framework 7 that gives developers a cleaner, code-first alternative to cramming complex registration logic into @Bean methods. Spring's own guidance discourages registering several beans from a single @Bean method or returning a broad supertype, since that limits flexibility - BeanRegistrar exists precisely for the cases those rules get in the way of.

class MetricsRegistrar implements BeanRegistrar {
    @Override
    public void register(BeanRegistry registry, Environment env) {
        registry.registerBean("meterRegistry", MeterRegistry.class,
            spec -> spec.supplier(ctx -> new SimpleMeterRegistry()));
    }
}

It's especially useful for conditional or dynamic bean registration, such as registering a different set of beans depending on active profiles or discovered configuration.

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