spring AOP中Cglib 代理配置问题，各位指点一下。

[星球本色]

<bean id="aopHelper" class="com.common.AopHelper" ></bean>
<aop:config proxy-target-class="true" >
<!-- 定义一个切面 -->
<aop:aspect ref="aopHelper">
<!-- 定义切入点 -->
<aop:pointcut id="myAspect" expression="execution(* *.insert*(..))" />
<!-- 前置通知 -->
<aop:before pointcut-ref="myAspect" method="before"/>
</aop:aspect>
</aop:config>
意思就是所有的insert开头的方法切到class="com.common.AopHelper"这个类里面。这个类里面就写了一个方法
public void before(){
System.out.println("我已经开始要记录操作行为了。");
}

系统报错
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlMapClientTemplate' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Cannot resolve reference to bean 'sqlMapClient' while setting bean property 'sqlMapClient'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlMapClient': Post-processing of the FactoryBean's object failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.ibatis.sqlmap.engine.impl.SqlMapClientImpl]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:329)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:107)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1391)

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlMapClient': Post-processing of the FactoryBean's object failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.ibatis.sqlmap.engine.impl.SqlMapClientImpl]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:165)

Caused by: org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.ibatis.sqlmap.engine.impl.SqlMapClientImpl]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:217)

Caused by: java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
at org.springframework.cglib.proxy.Enhancer.emitConstructors(Enhancer.java:721)
at org.springframework.cglib.proxy.Enhancer.generateClass(Enhancer.java:499)

2013-2-21 17:16:13 org.apache.catalina.core.StandardContext listenerStart
严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlMapClientTemplate' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Cannot resolve reference to bean 'sqlMapClient' while setting bean property 'sqlMapClient'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlMapClient': Post-processing of the FactoryBean's object failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.ibatis.sqlmap.engine.impl.SqlMapClientImpl]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:329)

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlMapClient': Post-processing of the FactoryBean's object failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.ibatis.sqlmap.engine.impl.SqlMapClientImpl]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:165)

... 30 more
Caused by: org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.ibatis.sqlmap.engine.impl.SqlMapClientImpl]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:217)
at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:110)

... 35 more
Caused by: java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
at org.springframework.cglib.proxy.Enhancer.emitConstructors(Enhancer.java:721)

... 42 more

[diaoyubing]

呵呵，前几天我也遇到了这个问题。下面是解决办法： aop代理分为jdk接口代理和cglib类代理，通过proxy-target-class来控制。 你写了 proxy-target-class="true" ，说明你要代理的是类而不是接口。 而expression="execution(* *.insert*(..))"，是所有有insert*方法的类都要代理，你查一下这些类是不是有的实现了接口，所以就报错了。 你可以把expression详细点不要写的这么宽泛，比如 expression="execution(* com.ssh.user.action.UserAction.*(..))",UserAction类不要实现接口。 这就搞定了，结贴给分吧~

[星球本色]

引用 1 楼 diaoyubing 的回复:

呵呵，前几天我也遇到了这个问题。下面是解决办法： aop代理分为jdk接口代理和cglib类代理，通过proxy-target-class来控制。 你写了 proxy-target-class="true" ，说明你要代理的是类而不是接口。 而expression="execution(* *.insert*(..))"，是所有有insert*方法的类都要代理，你查……

兄弟，我换了一种方式做出来的。这种方式没调出来啊。我那个AopHelper类是不是需要写一些cglib方面的代码啊。

[diaoyubing]

呵呵，不是的，看来还没明白我的意思。 AopHelper类与cglib代理无关。 项目中用的最多的就是cglib代理，最好是弄明白他。可以到网上搜搜“spring事务管理”方面的例子，试验下。