@Configuration @ConditionalOnClass(MathUtils.class) @EnableConfigurationProperties(MathUtilsProperties.class) public class MathUtilsAutoConfiguration { @Bean @ConditionalOnMissingBean public MathUtils mathUtils() { return new MathUtils(); } } @ConfigurationProperties(prefix = "math.utils") public class MathUtilsProperties { } public class MathUtils { } @SpringBootApplication public class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); } } math.utils.enabled=true @RestController public class MathUtilsController { private final MathUtils mathUtils; public MathUtilsController(MathUtils mathUtils) { this.mathUtils = mathUtils; } @GetMapping("/add") public int add(@RequestParam int a, @RequestParam int b) { return mathUtils.add(a, b); } }


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