spring项目中引入aop不能有private constructors否则报错：No visible constructors in class com.xxx.xxx.controller.

Caused by: org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.xxx.xxx.controller.EsController]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: No visible constructors in class com.xxx.xxx.controller.EsController     at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:212)     at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:109)     at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:447)     at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:333)     at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:293)     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:422)     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1571)     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)     ... 24 more Caused by: java.lang.IllegalArgumentException: No visible constructors in class com.xxx.xxx.controller.EsController     at org.springframework.cglib.proxy.Enhancer.filterConstructors(Enhancer.java:531)     at org.springframework.cglib.proxy.Enhancer.generateClass(Enhancer.java:448)     at org.springframework.cglib.transform.TransformingClassGenerator.generateClass(TransformingClassGenerator.java:33)     at org.springframework.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)     at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)     at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)     at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:317)     at org.springframework.aop.framework.ObjenesisCglibAopProxy.createProxyClassAndInstance(ObjenesisCglibAopProxy.java:57)     at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:202)