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https://issues.apache.org/jira/browse/SPARK-15869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15327822#comment-15327822
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Shixiong Zhu edited comment on SPARK-15869 at 6/13/16 5:47 PM:
---------------------------------------------------------------

Do you have a reproducer? "outputOpId" must not be `null`.


was (Author: zsxwing):
Do you have a reproducer?

> HTTP 500 and NPE on streaming batch details page
> ------------------------------------------------
>
>                 Key: SPARK-15869
>                 URL: https://issues.apache.org/jira/browse/SPARK-15869
>             Project: Spark
>          Issue Type: Bug
>          Components: Streaming, Web UI
>    Affects Versions: 2.0.0
>            Reporter: Maciej BryƄski
>
> When I'm trying to show details of streaming batch I'm getting NPE.
> Sample link:
> http://127.0.0.1:4040/streaming/batch/?id=1465553700000
> Error:
> {code}
> HTTP ERROR 500
> Problem accessing /streaming/batch/. Reason:
>     Server Error
> Caused by:
> java.lang.NullPointerException
>       at 
> scala.collection.convert.Wrappers$JCollectionWrapper.iterator(Wrappers.scala:59)
>       at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
>       at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
>       at 
> scala.collection.TraversableLike$class.groupBy(TraversableLike.scala:320)
>       at scala.collection.AbstractTraversable.groupBy(Traversable.scala:104)
>       at 
> org.apache.spark.streaming.ui.BatchPage.generateJobTable(BatchPage.scala:273)
>       at org.apache.spark.streaming.ui.BatchPage.render(BatchPage.scala:358)
>       at org.apache.spark.ui.WebUI$$anonfun$2.apply(WebUI.scala:81)
>       at org.apache.spark.ui.WebUI$$anonfun$2.apply(WebUI.scala:81)
>       at org.apache.spark.ui.JettyUtils$$anon$2.doGet(JettyUtils.scala:83)
>       at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
>       at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
>       at 
> org.spark_project.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
>       at 
> org.spark_project.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)
>       at 
> org.spark_project.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
>       at 
> org.spark_project.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
>       at 
> org.spark_project.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
>       at 
> org.spark_project.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
>       at 
> org.spark_project.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)
>       at 
> org.spark_project.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
>       at org.spark_project.jetty.server.Server.handle(Server.java:499)
>       at 
> org.spark_project.jetty.server.HttpChannel.handle(HttpChannel.java:311)
>       at 
> org.spark_project.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
>       at 
> org.spark_project.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
>       at 
> org.spark_project.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
>       at 
> org.spark_project.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
>       at java.lang.Thread.run(Thread.java:745)
> {code}



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