scala 无法从 JAR 文件加载主类
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Cannot load main class from JAR file
提问by sirine
I have an application Spark-scala, I tried to dispaly a simple message "Hello my App". when I compile it by sbt compile it's fine, also I run it by sbt run it's fine, I displayed my message with success but he display an error; like this:
我有一个应用程序 Spark-scala，我试图显示一条简单的消息“你好我的应用程序”。当我通过 sbt compile 编译它时，它很好，我也通过 sbt run 运行它很好，我成功地显示了我的消息，但他显示了错误；像这样：
Hello my application!
16/11/27 15:17:11 ERROR Utils: uncaught error in thread SparkListenerBus, stopping SparkContext
java.lang.InterruptedException
ERROR ContextCleaner: Error in cleaning thread
java.lang.InterruptedException
at org.apache.spark.ContextCleaner$$anon.run(ContextCleaner.scala:67)
16/11/27 15:17:11 INFO SparkUI: Stopped Spark web UI at http://10.0.2.15:4040
[success] Total time: 13 s, completed Nov 27, 2016 3:17:12 PM
16/11/27 15:17:12 INFO DiskBlockManager: Shutdown hook called
I can't understand, it's fine or no! Also when i try to load my file jar after the run, he dispaly also an error:
看不懂，好不好！此外，当我尝试在运行后加载我的文件 jar 时，他也显示了一个错误：
my command line look like:
我的命令行看起来像：
spark-submit "appfilms" --master local[4] target/scala-2.11/system-of-recommandation_2.11-1.0.jar
And the error this is:
错误是：
Error: Cannot load main class from JAR file:/root/projectFilms/appfilms
Run with --help for usage help or --verbose for debug output
16/11/27 15:24:11 INFO Utils: Shutdown hook called
Please can you answers me!
请你能回答我吗！
回答by Paul Velthuis
The error is due to the fact that the SparkContext is not stopped, this is required in versions higher than Spark 2.x.
This should be stopped to prevent this error by SparkContext.stop(), or sc.stop(). Inspiration for solving this error is gained from own experiences and the following sources: Spark Context, Spark Listener Bus error
错误是由于 SparkContext 没有停止这一事实，这在高于 Spark 2.x 的版本中是必需的。应通过SparkContext.stop(), 或停止此操作以防止出现此错误sc.stop()。解决此错误的灵感来自于自己的经验和以下来源：Spark Context, Spark Listener Bus error
回答by devD
You forgot to use --class Parameter spark-submit "appfilms" --master local[4] target/scala-2.11/system-of-recommandation_2.11-1.0.jar
您忘记使用 --class 参数 spark-submit "appfilms" --master local[4] target/scala-2.11/system-of-recommandation_2.11-1.0.jar
spark-submit --class "appfilms" --master local[4] target/scala-2.11/system-of-recommandation_2.11-1.0.jar.
spark-submit --class "appfilms" --master local[4] target/scala-2.11/system-of-recommandation_2.11-1.0.jar。
Please note if appfilm belong to any package dont forgot to add package name as below packagename.appfilms
请注意，如果 appfilm 属于任何包，请不要忘记添加如下包名 packagename.appfilms
I believe this will suffice
我相信这就足够了
