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java.lang.NullPointerException: 	at javax.xml.bind.DatatypeConverter.printBase64Binary(	at io.jsonwebtoken.impl.Base64Codec.encode(	at io.jsonwebtoken.impl.Base64UrlCodec.encode(	at io.jsonwebtoken.impl.DefaultJwtBuilder.base64UrlEncode(	at io.jsonwebtoken.impl.DefaultJwtBuilder.compact(