public <A extends Annotation> A getAnnotation(final Class<A> annotationClass) {
        return AnnotatedElementUtils.findMergedAnnotation(beanClass, annotationClass);
    }
Gets annotation from Bean Class.

@param annotationClass annotation class
@param <A>             class extend Annotation
@return annotation
shenyu-client/shenyu-client-core/src/main/java/org/apache/shenyu/client/core/register/ApiBean.java