public static Builder newBuilder() {
    return new Builder();
  }
Returns a new JwtValidator.Builder.

<p>By default, the JwtValidator requires that a token has a valid expiration claim, no issuer
and no audience claim. This can be changed using the expect...(),  ignore...() and
allowMissingExpiration() methods.

<p>If present, the JwtValidator also validates the not-before claim. The validation time can
be changed using the setClock() method.
java_src/src/main/java/com/google/crypto/tink/jwt/JwtValidator.java