Jpa under the controller can be used but the custom class methods can not have been submitted to the empty why

The controller jpa code normal

 

//controller class already annotation Resource method 
@ RequestMapping ("/reg ") 
Public String reg (it request, HttpServletResponse response, @ Valid the UserInfo backstageUser, BindingResult BindingResult) {

The UserInfo user=userDao. GetOne (1); 
System. The out. Println (" system111: "+ user. GetName ());//here can normal to get the data 


CommonUtil111 aa=new CommonUtil111 (); 
Aa. Aa (request);//call the method will be an error 
} 

CommonUtil111

 
Public class CommonUtil111 {
@ the Resource 
Public UserDao UserDao; 

Public String aa (it request) {
The UserInfo w=userDao. GetOne (1);//there can not have been submitted to the Java lang. NullPointerException: null 
System. The out. Println (" system444: "+ w.g etName ()); 
Return ""; 
} 
} 

UserDao

 

Public interface UserDao extends JpaRepository {

} 

CodePudding user response:

What a great god help me see otherwise good trouble ah

CodePudding user response:

Use the @autowired UserDao UserDao

CodePudding user response:

Null fault is still the same

CodePudding user response:

Know how to solve