Superclass has no null constructors but no arguments were given

[color=red]org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.lj.cms.service.IndexService]: 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


Caused by:
java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given[/color]

 <aop:config>

<aop:aspect ref="indexService">


<aop:pointcut id="generateTopPoint"

expression="execution(* com.lj.cms.service.ChannelService.add*(..))||

execution(* com.lj.cms.service.ChannelService.delete*(..))||

execution(* com.lj.cms.service.ChannelService.update*(..))"/>

<aop:after method="generateTop" pointcut-ref="generateTopPoint"/>
	</aop:aspect>
	</aop:config> 


<bean id="ftlPath" class="java.lang.String">

<constructor-arg value="/ftl"></constructor-arg>
	</bean>

	<bean id="outPath" class="java.lang.String">

<constructor-arg value="/jsp/template"></constructor-arg>
	</bean>


	@Autowired(required=true)
	public IndexService(String ftlPath,String outPath)
	{


if(util==null){ 

this.outPath = outPath;

util=FreemarkerUtil.getInstance(ftlPath);//ftlPath在beans.xml中配置了依赖注入，值为/ftl

}
	}

上述代码原本运行时是没有错误的。
后来因为需求把 <aop:config> 的内容去掉了。
结果就一直报如上错误。


弄了半天， 最后在stackoverflow上找到原因：
[url]http://stackoverflow.com/questions/13711347/spring-constructor-dependency-injection-issues[/url]

Classes to be proxied by CGLIB (for AOP support) must have no-args constructors.

These no-args constructors don't have to be public and it doesn't affect anything else - you can use other constructors as usually:


因此只要加入

public IndexService()
{
}

问题就解决了。

最后

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