异常:

Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'java.lang.reflect.InvocationHandler' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}

Description:

Parameter 0 of constructor in com.sun.proxy.$Proxy77 required a bean of type 'java.lang.reflect.InvocationHandler' that could not be found.
Action:

Consider defining a bean of type 'java.lang.reflect.InvocationHandler' in your configuration.

错误代码：

@Component
public class XHGAProxyScan2 implements ApplicationContextAware,InitializingBean {
    ApplicationContext applicationContext;
    @Override
    public void afterPropertiesSet() throws Exception { }
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
        String name = "testApiService";
        //被代理对象
        Object proxyB = (TestApi) () -> {
            System.out.println("------new :↓------");
            return "new Object: hello";
        };
        Class<?> interfaceClass = TestApi.class;
        XHGAProxy xhgaProxy = new XHGAProxy<>(proxyB);
        //代理对象
        Object proxyA = Proxy.newProxyInstance(interfaceClass.getClassLoader(),
                new Class[]{interfaceClass}, xhgaProxy);
        // 进行注册步骤：
        ConfigurableApplicationContext configurableApplicationContext = (ConfigurableApplicationContext) applicationContext;
        DefaultListableBeanFactory beanFactory =
                (DefaultListableBeanFactory) configurableApplicationContext.getBeanFactory();
        BeanDefinitionBuilder beanDefinitionBuilder =
                BeanDefinitionBuilder.genericBeanDefinition(proxyA.getClass());
        //-------↓添加以下代码
        /*beanDefinitionBuilder.addConstructorArgValue(Proxy.getInvocationHandler(proxyA));
        AbstractBeanDefinition beanDefinition = beanDefinitionBuilder.getBeanDefinition();
        beanDefinition.setBeanClass(proxyA.getClass());*/
        //-------↑
        beanFactory.registerBeanDefinition(name, beanDefinitionBuilder.getRawBeanDefinition());
    }

解决方法:

      将上面注释的代码取消注释：

//-------↓添加以下代码
beanDefinitionBuilder.addConstructorArgValue(Proxy.getInvocationHandler(proxyA));
AbstractBeanDefinition beanDefinition = beanDefinitionBuilder.getBeanDefinition();
beanDefinition.setBeanClass(proxyA.getClass());
//-------↑

参考以下博客完美解决问题：

 小眼儿： https://www.cnblogs.com/hujunzheng/p/8527338.html