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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:

OAuth2Authentication oAuth2Authentication = (OAuth2Authentication) SecurityContextHolder.getContext().getAuthentication();

LinkedHashMap linkedHashMap = (LinkedHashMap) oAuth2Authentication.getUserAuthentication().getDetails();


user.setAuthorities((Set<GrantedAuthority>) oAuth2Authentication.getAuthorities());

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.

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