non utility static methods

I have a method which extract the loggedin user details from springsecuritycontext object.

I have read that only utility methods(which does certain calculation) should be static .

Here is my method , it doesn't seems to be a utility method but I don't find any reason why I shouldn't make it static as I am using it in multiple beans

public static int getSignedUpUser()
    {
        final SecurityContext ctx = SecurityContextHolder.getContext();

        if(ctx != null)
        {
            final Authentication auth = ctx.getAuthentication();

            if(auth != null)
            {
                final Object principal = auth.getPrincipal();


                if(principal instanceof AUser)
                {
                    final AUser au = (AUser)principal;
                    return au.getId();
                }
            }
        }

        return 0;
    }
}