Invalid BSON field name userage

 mongodb 做数据更新时 报错 ：Invalid BSON field name userage

java.lang.IllegalArgumentException: Invalid BSON field name userage

  at org.bson.AbstractBsonWriter.writeName(AbstractBsonWriter.java:532)
  at org.bson.codecs.BsonDocumentCodec.encode(BsonDocumentCodec.java:114)
  at org.bson.codecs.BsonDocumentCodec.encode(BsonDocumentCodec.java:41)
  at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:60)
  at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:29)
  at com.mongodb.operation.BulkWriteBatch$WriteRequestEncoder.encode(BulkWriteBatch.java:398)
  at com.mongodb.operation.BulkWriteBatch$WriteRequestEncoder.encode(BulkWriteBatch.java:377)
  at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:63)
  at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:29)

        UpdateResult result = collection.updateOne(Filters.eq("username", "zhangsan1"),new Document("$set",new Document("usersex", "男").append("userdesc","VERY GOOD")).append("userage",66));

检查后发现 多条件更新 append应该跟在 操作符的document后面