Flink用scala写出现Type mismatch

1. 异常

import org.apache.flink.api.scala._
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment
import org.learn.source.SourceFromFile
import org.learn.vo.ClassInfo  

object WordCount {
  def main(args: Array[String]): Unit = {
    val streamEnvironment = StreamExecutionEnvironment.getExecutionEnvironment

    streamEnvironment
      .addSource(new SourceFromFile)
      .map(x => parseJson(x))

    streamEnvironment.execute()
  }
}

IDEA提示错误：

Type mismatch.
Required: MapFunction [String, NotInferedR]
Found:    Function1   [Nothing, ClassInfo]

2. 错误原因

StreamExecutionEnvironment导包错误。

用scala写时，应该导入：

import org.apache.flink.streaming.api.scala.StreamExecutionEnvironment

导入新包后，IDEA错误提示消失。