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because it is a JDK dynamic prox

because it is a JDK dynamic prox

作者: 墨色尘埃 | 来源:发表于2019-01-10 17:03 被阅读89次
    Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
    2017-08-01 09:37:14.845 ERROR 12264 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 
     
    ***************************
    APPLICATION FAILED TO START
    ***************************
     
    Description:
     
    The bean 'AdapterSchemeVersionService' could not be injected as a 'com.yihu.hos.rest.services.standard.adapter.AdapterSchemeVersionService' 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.
    

    出现这种异常可能有两个原因:
    1.使用spring-boot做事务管理时,出现异常:The bean 'xxx' could not be injected as a 'xx.xxxx' because it is a JDK dynamic proxy that implements:

    搞了半天发现是因为代理的原因
    解决方法:
    ① 使用 @Transactional
    开启@Transactional 注解支持,两种方式,一种是通过xml的方式

        <annotation-driven transaction-manager="txManager">
            <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
                <property name="dataSource" ref="dataSource"/>
            </bean>
        </annotation-driven>
    

    ② 另外一种是使用@EnableTransactionManagement,将该注解标注在@Configuration类上,等价于上面的<tx:annotation-driven/>
    Spring推荐奖该注解标记在类(方法)而不是接口,将注解标记在接口上时,只有使用动态代理的时候才会生效,需要标记proxy-target-class="true"或者mode="aspectj",如下:

    @RestController
    @SpringBootApplication
    @EnableCaching
    /**
     * 在 SpringBootApplication 上使用@ServletComponentScan 注解后,Servlet、Filter、Listener
     * 可以直接通过 @WebServlet、@WebFilter、@WebListener 注解自动注册,无需其他代码。
     * */
    @ServletComponentScan
    @EnableScheduling
    @EnableTransactionManagement(proxyTargetClass = true)
    @EnableSwagger2
    public class App {
    
    }
    
    1. CGLib 方式实现AOP代理问题
      当我们需要使用CGLIB来实现AOP的时候,需要配置spring.aop.proxy-target-class=true,不然默认使用的是标准Java的实现,就会报错。
      解决方法:在yml文件中加入
    spring:
    
      aop:
        proxy-target-class: true
    

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