dubbo-config/dubbo-config-spring/src/main/java/org/apache/dubbo/config/spring/util/AnnotatedBeanDefinitionRegistryUtils.java [191:214]:
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    public static BeanNameGenerator resolveAnnotatedBeanNameGenerator(BeanDefinitionRegistry registry) {
        BeanNameGenerator beanNameGenerator = null;

        if (registry instanceof SingletonBeanRegistry) {
            SingletonBeanRegistry singletonBeanRegistry = SingletonBeanRegistry.class.cast(registry);
            beanNameGenerator =
                    (BeanNameGenerator) singletonBeanRegistry.getSingleton(CONFIGURATION_BEAN_NAME_GENERATOR);
        }

        if (beanNameGenerator == null) {

            if (logger.isInfoEnabled()) {

                logger.info("BeanNameGenerator bean can't be found in BeanFactory with name ["
                        + CONFIGURATION_BEAN_NAME_GENERATOR + "]");
                logger.info("BeanNameGenerator will be a instance of " + AnnotationBeanNameGenerator.class.getName()
                        + " , it maybe a potential problem on bean name generation.");
            }

            beanNameGenerator = new AnnotationBeanNameGenerator();
        }

        return beanNameGenerator;
    }
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dubbo-config/dubbo-config-spring/src/main/java/org/apache/dubbo/config/spring/beans/factory/annotation/ServiceAnnotationPostProcessor.java [296:320]:
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    private BeanNameGenerator resolveBeanNameGenerator(BeanDefinitionRegistry registry) {

        BeanNameGenerator beanNameGenerator = null;

        if (registry instanceof SingletonBeanRegistry) {
            SingletonBeanRegistry singletonBeanRegistry = SingletonBeanRegistry.class.cast(registry);
            beanNameGenerator =
                    (BeanNameGenerator) singletonBeanRegistry.getSingleton(CONFIGURATION_BEAN_NAME_GENERATOR);
        }

        if (beanNameGenerator == null) {

            if (logger.isInfoEnabled()) {

                logger.info("BeanNameGenerator bean can't be found in BeanFactory with name ["
                        + CONFIGURATION_BEAN_NAME_GENERATOR + "]");
                logger.info("BeanNameGenerator will be a instance of " + AnnotationBeanNameGenerator.class.getName()
                        + " , it maybe a potential problem on bean name generation.");
            }

            beanNameGenerator = new AnnotationBeanNameGenerator();
        }

        return beanNameGenerator;
    }
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