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Spring mvc works with AdminDaoImpl but not if you implement the AdminDao

 
Greenhorn
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I can persist an admin to the database when i dont implement the interface but when i implement it, i get this error.



adminDao


AdminDaoImpl



but when i do this it works, but i dont want to to it this way i want to implement the interface


adminservice


Please can anyone help me with this, it must be a way to get it to work when implementing the interface ?
 
Rancher
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Eclipse IDE Spring Tomcat Server
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You should code your service to the interface not to the implementation. In other words, in admin service, declare ar as AdminService
 
mike molin
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i get the same problem if i code it to the adminservice, as long as i dont implement the interface it works, but as soon as i implement it i get the same error
 
Jayesh A Lalwani
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Sorry, my mistake. In AdminService, declare are as AdminDAO, not as AdminDAOImpl
 
mike molin
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Thank you so much now it works :-)
But why does it work when i use the Dao and not the DaoImpl
 
Jayesh A Lalwani
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When you have an AOP annotation on a class that implements an interface, spring creates a java proxy class that implements the interface. When the proxy is called, it calls the aspect and your class. If your class doesn't implement interface, spring cannot use java proxy, so it falls back to using cglib, which creates a class that extends your class. So, the differrence is when you implement interface spring creates a class that implements the interface, when you don't implement interface, spring creates a class that extends your class

Now, during auto wiring, if it has a proxy class that implements the AdminDAO interface, it cannot inject it I to a property of type admindaoimpl. Once you changed your auto wiring to inject the interface, it worked
 
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