具体的问题是：

java.lang.ClassNotFoundException: com.imooc.bigdata.SparkWordCountApp
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)
	at org.apache.spark.util.Utils$.classForName(Utils.scala:238)
	at org.apache.spark.deploy.SparkSubmit.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:810)
	at org.apache.spark.deploy.SparkSubmit.doRunMain$1(SparkSubmit.scala:167)
	at org.apache.spark.deploy.SparkSubmit.submit(SparkSubmit.scala:195)
	at org.apache.spark.deploy.SparkSubmit.doSubmit(SparkSubmit.scala:86)
	at org.apache.spark.deploy.SparkSubmit$$anon$2.doSubmit(SparkSubmit.scala:924)
	at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:933)
	at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

这个问题我搜了很多次，也试了不同的方法去解决，但是就不行。
我的command是：

./bin/spark-submit --class com.imooc.bigdata.SparkWordCountApp\
 --master yarn\
  --name SparkWordCountApp\
   /home/hadoop/lib/sparksql-train-1.0.jar\
   hdfs://hadoop000:8020/pk/wc.data hdfs://hadoop000:8020/pk/out

我也核对了我scala的文件文件名和文件里的内容，都是SparkWordCountApp。