使用IDEA运行sparkStreaming时报错Exception in thread "main" java.lang.NullPointerException

Exception in thread "main" java.lang.NullPointerException   
at java.io.Reader.<init>(Reader.java:78)    
at java.io.InputStreamReader.<init>(InputStreamReader.java:129)     
at scala.io.BufferedSource.reader(BufferedSource.scala:24)  
at scala.io.BufferedSource.bu

由于IDEA没有设置resources源，导致程序读取不到文件

val namesResource = this.getClass.getResourceAsStream("/names.csv")

解决办法是：在IDEA上设置数据源文件夹位置
具体设置如下：

图片.png

图片.png

源代码：

import java.io.PrintWriter
import java.net.ServerSocket
import org.apache.log4j.{Level, Logger}//设置打印内容的级别

import scala.util.Random

object StreamingProducer {

  def main(args: Array[String]) {
    Logger.getLogger("org").setLevel(Level.ERROR)//只打印ERROR级别的日志

    val random = new Random()

    // Maximum number of events per second
    val MaxEvents = 6

    // Read the list of possible names
    val namesResource = this.getClass.getResourceAsStream("/names.csv")
    val names = scala.io.Source.fromInputStream(namesResource)
      .getLines()
      .toList
      .head
      .split(",")
      .toSeq

    // Generate a sequence of possible products
    val products = Seq(
      "iPhone Cover" -> 9.99,
      "Headphones" -> 5.49,
      "Samsung Galaxy Cover" -> 8.95,
      "iPad Cover" -> 7.49
    )

    /** Generate a number of random product events */
    def generateProductEvents(n: Int) = {
      (1 to n).map { i =>
        val (product, price) = products(random.nextInt(products.size))
        val user = random.shuffle(names).head
        (user, product, price)
      }
    }

    // create a network producer
    val listener = new ServerSocket(9999)
    println("Listening on port: 9999")

    while (true) {
      val socket = listener.accept()
      new Thread() {
        override def run = {
          println("Got client connected from: " + socket.getInetAddress)
          val out = new PrintWriter(socket.getOutputStream(), true)

          while (true) {
            Thread.sleep(1000)
            val num = random.nextInt(MaxEvents)
            val productEvents = generateProductEvents(num)
            productEvents.foreach{ event =>
              out.write(event.productIterator.mkString(","))
              out.write("\n")
            }
            out.flush()
            println(s"Created $num events...")
          }
          socket.close()
        }
      }.start()
    }
  }
}