<chapter09> jwtfactory부분에서 오류가 뜨네요

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C:\Users\JJS\Downloads\blogapi\src\test\java\shinsunyoung\springbootdeveloper\config\jwt\JwtFactory.java:32: error: cannot find symbol
        return JwtFactory.builder().build();
                         ^
  symbol:   method builder()
  location: class JwtFactory