spark toDF 失败原因总结

错误提示
value toDF is not a member of org.apache.spark.rdd.RDD[(org.apache.spark.ml.

解决办法
val conf = new SparkConf().setAppName(“SimpleParamsExample1”)
val sc = new SparkContext(conf)

val sqlContext= new org.apache.spark.sql.SQLContext(sc)
import sqlContext.implicits._

错误: 找不到或无法加载主类 example.Statistics
译器顺序：右键项目-properties-scala Compiler -Build manager ：
set the compile order to JavaThenScala instead of Mixed

右键项目-properties-scala Compiler -Standard
选择安装的scala 版本