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java.lang.NullPointerException: 	at javax.xml.bind.DatatypeConverter.printBase64Binary(DatatypeConverter.java:547)	at io.jsonwebtoken.impl.Base64Codec.encode(Base64Codec.java:21)	at io.jsonwebtoken.impl.Base64UrlCodec.encode(Base64UrlCodec.java:22)	at io.jsonwebtoken.impl.DefaultJwtBuilder.base64UrlEncode(DefaultJwtBuilder.java:350)	at io.jsonwebtoken.impl.DefaultJwtBuilder.compact(DefaultJwtBuilder.java:296)