public boolean existBean(final String className) {
        String beanName = this.getBeanName(className);
        return this.applicationContext.containsBean(beanName);
    }
Exist spring bean boolean.
Only applies to successful beans registered by the {@linkplain #registerBean(BeanDefinition, ClassLoader)} method.

@param className the class name
@return the boolean
shenyu-plugin/shenyu-plugin-api/src/main/java/org/apache/shenyu/plugin/api/utils/SpringBeanUtils.java