Java.lang.ClassCastException:com.sun.proxy. $Proxy * cannot be cast to*** problem solution

Clinical manifestations:

1. Use spring AOP dynamic proxy;
2. The Bean class that is managed with spring inherits from an interface;
3. The spring container has the ID of the bean you want to proxy, but the ID cannot be cast to the Bean class.

cases:
To define a proxy class:

@Transactional@Repositorypublic UserDaoImpl implements UserDao extends BaseDaoImpl{/*没有实现任何接口*/}

Get the proxy class:

new ClassPathXmlApplicationContext("applicationContext.xml");UserDaoImpl userDaoImpl = (UserDaoImpl)ctx.getBean("userDaoImpl");

Error:

java.lang.ClassCastException:com.sun.proxy.$Proxy12 cannot be cast to UserDaoImpl

causes:
There are two proxy methods for spring AOP, one is the regular JDK, the other is cglib, and my Userdao has an interface Iuserdao, when the proxy object implements at least one interface, the proxy object is dynamically created by default using the JDK when the proxy object does not implement any interfaces. You will use the Cglib method. Click here to view more >>>
Treatment Methods
If your proxy object does not have a method to implement the interface, it converts the proxy object into an interface.
The code to get the proxy class is:

ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
UserDao userDao = (UserDaoImpl)ctx.getBean("userDaoImpl");


Java.lang.ClassCastException:com.sun.proxy. $Proxy * cannot be cast to*** problem solution