SparkUI executor tab failing

[xtordoir]

The spark UI fails to display executors. More precisely, the call to localhost:4040/api/v1/applications is returning the following error:

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: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.servlets.gzip.GzipHandler.handle(GzipHandler.java:479)
	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:748)

Looks like jersey-client 1 vs 2 conflict

[vidma]

which versions?
in the case of version conflict, generally I would expect a more weird exception than NullPointerException. but who knows... :)

@xtordoir you might be interested in this quite recent commit: e21b668 which introduced jersey-client as a new SN dependency.
try reverting the commit.