@Override
	public Collection<GrantedAuthority> getAuthorities() {
		return ImmutableList.of(new SimpleGrantedAuthority(getUser().getRole().getShortName()));
	}
Return provided authorities. It returns one Role from {@link User} in the {@link GrantedAuthority} list.

@return {@link GrantedAuthority} list
ngrinder-controller/src/main/java/org/ngrinder/security/SecuredUser.java