The bean 'xxx' could not be injected as a 'com.github.service.xx' because it is a JDK dynamic proxy

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最新推荐文章于 2024-06-15 13:19:19 发布

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分类专栏：错误杂记文章标签： ScopedProxyMode @EnableAspectJAutoProxy 代理方式出错

本文链接：https://blog.youkuaiyun.com/z394642048/article/details/84759331

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本文详细介绍了在Spring框架中，因CGLib动态代理与JDK动态代理不兼容导致的问题及其解决方案。通过添加@EnableAspectJAutoProxy(proxyTargetClass=true)注解或使用@Scope(proxyMode=ScopedProxyMode.TARGET_CLASS)，可以有效解决服务层注入失败的问题。

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Description:

The bean 'pltresService' could not be injected as a 'com.github.service.PltresService' because it is a JDK dynamic proxy that implements:


Action:

Consider injecting the bean as one of its interfaces or forcing the use of CGLib-based proxies by setting proxyTargetClass=true on @EnableAsync and/or @EnableCaching.

分析可知，因为有些service使用了CGLib这种动态代理而不是JDK原生的代理，所以导致问题的出现。

解决方法：

①在启动类上添加@EnableAspectJAutoProxy(proxyTargetClass = true)注解：

@EnableCaching
@SpringBootApplication
@EnableDiscoveryClient  // springcloud 客户端
@EnableFeignClients    // feign 客户端特殊标识，默认集成ribbon。是一个http客户端
@EnableHystrix     // hystrix 断路器  可以和feign配合使用，则@EnableFeignClients @EnableHystrix2个注解都得加上
@EnableAspectJAutoProxy(proxyTargetClass = true)
public class Application {

	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
	}

}

②在报错的service上添加@Scope(proxyMode = ScopedProxyMode.TARGET_CLASS)注解：

@Service
@Scope(proxyMode = ScopedProxyMode.TARGET_CLASS)
public class PltresService {

    @Resource
    private PltresMapper pltresMapper;

    …… …… ……

}

分析ScopedProxyMode可以发现不同的参数值就对应了不同的代理类型。

public enum ScopedProxyMode {

	/**
	 * Default typically equals {@link #NO}, unless a different default
	 * has been configured at the component-scan instruction level.
	 */
	DEFAULT,

	/**
	 * Do not create a scoped proxy.
	 * <p>This proxy-mode is not typically useful when used with a
	 * non-singleton scoped instance, which should favor the use of the
	 * {@link #INTERFACES} or {@link #TARGET_CLASS} proxy-modes instead if it
	 * is to be used as a dependency.
	 */
	NO,

	/**
	 * Create a JDK dynamic proxy implementing <i>all</i> interfaces exposed by
	 * the class of the target object.
	 */
	INTERFACES,

	/**
	 * Create a class-based proxy (uses CGLIB).
	 */
	TARGET_CLASS;

}