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I have the following code (attempting to log a user in programatically): List<GrantedAuthority> authorities = new ArrayList<GrantedAuthority>(); authorities.add(new GrantedAuthorityImpl("ROLE_ADMIN")); ... User tempUser = new User(correctUsername, correctPassword, true, true, true, true, // logging them in... authorities // type is List<GrantedAuthority> ); ... Authentication authentication = new UsernamePasswordAuthenticationToken(tempUser, authorities); // I'm using authorities again (List<GrantedAuthority>) // is this the right spot for it? ... // this is the line causing the error authentication.setAuthenticated(true); When I try to run that I get the following: java.lang.IllegalArgumentException: Cannot set this token to trusted - use constructor which takes a GrantedAuthority list instead Note that I'm using the authorities list of GrantedAuthority s both in the User and Authentication objects. I'm not sure where I should be using those. I'm trying to replicate the answer for another SO question but am running into the exception posted above. Other similar questions that didn't quite answer my question: How to programmatically log user in with Spring Security 3.1 Programmatically login in a user using spring security After some searching the c

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