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https://issues.apache.org/jira/browse/SPARK-22365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16220631#comment-16220631
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Sean Owen commented on SPARK-22365:
-----------------------------------

Is there no other error following this? a "Caused by" log? if it's really an 
error from inside jersey, I'm not sure if it's attributable to Spark, but still 
bears investigating. If it's actually an NPE from Spark code, then we need to 
see where. Unless anyone can reproduce it, it's hard to say what could be done.

> Spark UI executors empty list with 500 error
> --------------------------------------------
>
>                 Key: SPARK-22365
>                 URL: https://issues.apache.org/jira/browse/SPARK-22365
>             Project: Spark
>          Issue Type: Bug
>          Components: Web UI
>    Affects Versions: 2.2.0
>            Reporter: Jakub Dubovsky
>
> No data loaded on "execturos" tab in sparkUI with stack trace below. Apart 
> from exception I have nothing more. But if I can test something to make this 
> easier to resolve I am happy to help.
> {{java.lang.NullPointerException
>       at 
> org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388)
>       at 
> org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341)
>       at 
> org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228)
>       at 
> org.spark_project.jetty.servlet.ServletHolder.handle(ServletHolder.java:845)
>       at 
> org.spark_project.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1689)
>       at 
> org.apache.hadoop.yarn.server.webproxy.amfilter.AmIpFilter.doFilter(AmIpFilter.java:164)
>       at 
> org.spark_project.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1676)
>       at 
> org.spark_project.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:581)
>       at 
> org.spark_project.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)
>       at 
> org.spark_project.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)
>       at 
> org.spark_project.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112)
>       at 
> org.spark_project.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
>       at 
> org.spark_project.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:461)
>       at 
> org.spark_project.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
>       at 
> org.spark_project.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
>       at org.spark_project.jetty.server.Server.handle(Server.java:524)
>       at 
> org.spark_project.jetty.server.HttpChannel.handle(HttpChannel.java:319)
>       at 
> org.spark_project.jetty.server.HttpConnection.onFillable(HttpConnection.java:253)
>       at 
> org.spark_project.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)
>       at 
> org.spark_project.jetty.io.FillInterest.fillable(FillInterest.java:95)
>       at 
> org.spark_project.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
>       at 
> org.spark_project.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)
>       at 
> org.spark_project.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)
>       at 
> org.spark_project.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)
>       at 
> org.spark_project.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)
>       at 
> org.spark_project.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)
>       at java.lang.Thread.run(Thread.java:748)}}



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