There is an Oauth2Authentication object that contains user-authority. When I want to get its authority and set it in authority of User object like this:

OAuth2Aut


There is an Oauth2Authentication object that contains user-authority. When I want to get its authority and set it in authority of User object like this:


the following exception is raised:


  
java.lang.ClassCastException:
  java.util.Collections$UnmodifiableRandomAccessList cannot be cast to
  java.util.Set


How do I fix it?

Note:

The type of Authorities of User object is Set<GrantedAuthority>




Restarted Visual Studio twice solved my problem.

First, I restarted but it did not work. Then, I did almost everything but still didn't work.

Then, restarted again solved my problem. 

        

            

javaspring-securityoauth-2.0spring-security-oauth2unmodifiable            
            




         

    

            

                
            
 
    

            2019-03-11T14:09:39.340