When using new 10.0.0 connector with kotlin, arrays are converted into ArrayList (in BsonDocumentToRowConverter) and resulting into this error : 

Caused by: java.lang.RuntimeException: Error while encoding: java.lang.RuntimeException: java.util.ArrayList is not a valid external type for schema of array<double>

Versions used

I am using spark-core, spark-sql, spark-catalyst in version 3.2.1 and mongo-spark-connector in 10.0.0

How to reproduce
Insert this document in mongo 

{
  "coordinates": {
    "type": "Point",
    "coordinates": [
      0.0002895,
      50.4227494
    ]
  }
} 

Then try to read it in spark with mongo connector : 

val spark = SparkSession.builder()
    .master("local")
    .appName("Test")
    .config("spark.mongodb.read.connection.uri", "localhost:27017/test")
    .orCreate

val rdd = spark.read().format("mongodb").load()
rdd.printSchema()
rdd.show() 

Debugging the code lead me to think that the problem is coming from ArrayList used in convertToArray function in BsonDocumentToRowConverter. Java ArrayList is not mapped to Kotlin List from what I understand.