我有一个 Spring Web 应用程序，它被配置为使用 JDK 代理进行 AOP。 AOP 注释(例如@Transactional)在接口(interface)上声明，而不是在实现类上声明。

应用程序本身工作正常，但是当我运行单元测试时，它似乎试图将 CGLIB 用于 AOP 功能(而不是 JDK 代理)。这会导致测试失败 - 我在下面附加了堆栈跟踪。

我不明白为什么在运行测试时使用CGLIB，因为Spring配置与应用程序运行时基本相同。一个可能的显着差异是测试配置使用 DataSourceTransactionManager而不是 JTA 事务管理器。测试类本身都扩展了 AbstractJUnit4SpringContextTests , 会不会是这个类以某种方式硬连接到使用 CGLIB？

Caused by: org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class $Proxy25]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Cannot subclass final class class $Proxy25
    at org.springframework.aop.framework.Cglib2AopProxy.getProxy(Cglib2AopProxy.java:213)
    at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:110)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:488)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:363)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:324)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:361)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1343)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:473)
    ... 79 more
Caused by: java.lang.IllegalArgumentException: Cannot subclass final class class $Proxy25
    at net.sf.cglib.proxy.Enhancer.generateClass(Enhancer.java:446)
    at net.sf.cglib.transform.TransformingClassGenerator.generateClass(TransformingClassGenerator.java:33)
    at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
    at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
    at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)
    at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:285)
    at org.springframework.aop.framework.Cglib2AopProxy.getProxy(Cglib2AopProxy.java:201)
    ... 86 more

编辑:其中一位评论员要求我发布 Spring 配置。我在下面以缩写形式包含了它(即省略了不相关的 bean 和 XML 命名空间)。

spring-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans>                 
    <!-- ANNOTATION SUPPORT -->
    <!-- Include basic annotation support -->
    <context:annotation-config/>        

    <!-- CONTROLLERS -->
    <!-- Controllers, force scanning -->
    <context:component-scan base-package="com.onebigplanet.web.controller,com.onebigplanet.web.ws.*"/>  

    <!-- Post-processor for @Aspect annotated beans, which converts them into AOP advice -->
    <bean class="org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator">
        <property name="proxyTargetClass" value="true"/>
    </bean>

    <!-- An @Aspect bean that converts exceptions thrown in POJO service implementation classes to runtime exceptions  -->
    <bean id="permissionAdvisor" class="com.onebigplanet.web.advisor.PermissionAdvisor"/>
    <bean id="businessIntelligenceAdvisor" class="com.onebigplanet.web.advisor.bi.BusinessIntelligenceAdvisor"/>        

    <!-- Finds the controllers and sets an interceptor on each one -->
    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping">
        <property name="interceptors">
            <list>
                <bean class="com.onebigplanet.web.interceptor.PortalInterceptor"/>              
            </list>
        </property>
    </bean> 

    <!-- METHOD HANDLER ADAPTER --> 
    <!-- Finds mapping of url through annotation on methods of Controller -->
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="cacheSeconds" value="0"/>
        <property name="webBindingInitializer">
            <bean class="com.onebigplanet.web.binder.WebBindingInitializer"/>
        </property>
    </bean> 
</beans>

applicationContext-service.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans> 
    <!-- Declares a bunch of bean post-processors -->
    <context:annotation-config/>

    <context:component-scan base-package="com.onebigplanet.service.impl,com.onebigplanet.dao.impl.mysql" annotation-config="false"/>    

    <!-- Property configurer -->
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="/WEB-INF/obp-service.properties" />
    </bean> 

    <!-- Post-processor for @Aspect annotated beans, which converts them into AOP advice -->
    <bean class="org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator"/>

    <!-- An @Aspect bean that converts exceptions thrown in service implementation classes to runtime exceptions  -->
    <bean id="exceptionAdvisor" class="com.onebigplanet.service.advisor.ExceptionAdvisor"/>
    <bean id="cachingAdvisor" class="com.onebigplanet.service.advisor.CacheAdvisor"/>   
    <bean id="businessIntelligenceAffiliateAdvisor" class="com.onebigplanet.service.advisor.BusinessIntelligenceAffiliateAdvisor"/>

    <!-- Writable datasource -->
    <jee:jndi-lookup id="dataSource" jndi-name="java:/ObpDS"/>

    <!-- ReadOnly datasource -->
    <jee:jndi-lookup id="readOnlyDataSource" jndi-name="java:/ObpReadOnlyDS"/>  

    <!-- Map the transaction manager to allow easy lookup of a UserTransaction -->
    <bean id="transactionManager" class="org.springframework.transaction.jta.JtaTransactionManager"/>

    <!-- Annotation driven transaction management -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

applicationContext-test.xml 这仅在运行单元测试时包含。它的目的是覆盖其他配置文件中声明的一些 bean。

<?xml version="1.0" encoding="UTF-8"?>
<beans>         
    <!-- Overwrite the property configurer bean such that it reads the test properties file instead -->
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="/obp-test.properties"/>
    </bean> 

    <!-- All DAOs should use the test datasource -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="${testDataSource.driverClassName}"/>
        <property name="url" value="${testDataSource.url}"/>
        <property name="username" value="${testDataSource.username}"/>
        <property name="password" value="${testDataSource.password}"/>
    </bean>

    <bean id="readOnlyDataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="${testDataSource.driverClassName}"/>
        <property name="url" value="${testDataSource.url}"/>
        <property name="username" value="${testDataSource.username}"/>
        <property name="password" value="${testDataSource.password}"/>
    </bean>

    <!-- 
        Overwrite the JTA transaction manager bean defined in applicationContent-service.xml with this one because
        the implementation of the former is provided by JBoss
    -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>
<beans>

最佳答案

听起来您引用的是实现类而不是接口(interface)。有一个 excerpt here有更多的细节。

Spring 论坛帖子:"Mixing JDK and CGLIB proxies"

一篇很棒的博文解释了 pros and cons of JDK vs. CGLIB proxies .

关于java - 运行 Spring 单元测试的 AOP 问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/341624/