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val sc = SparkContext.getOrCreate()
val cl = new UserListClassLoader(sc.jars.map(new URL(_)).toArray,
    Thread.currentThread.getContextClassLoader, List(
      "org.apache.parquet.hadoop.OurCustomParquetOutputFormat",
      "org.apache.parquet.hadoop.CodecFactory",
      "org.apache.parquet.hadoop.ParquetFileWriter",
      "org.apache.parquet.hadoop.ParquetRecordWriter",
      "org.apache.parquet.hadoop.InternalParquetRecordWriter",
      "org.apache.parquet.hadoop.ColumnChunkPageWriteStore",
      "org.apache.parquet.hadoop.MemoryManager"
    ))

val format = cl.
  loadClass("org.apache.parquet.hadoop.OurCustomParquetOutputFormat").
  newInstance().asInstanceOf[FileOutputFormat[Void, T]]