2016-01-14 07:59:52,948 INFO  [com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsPoller] (default task-9) Starting HystrixMetricsPoller
2016-01-14 07:59:52,955 INFO  [com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet] (default task-9) Starting poller
2016-01-14 07:59:58,472 INFO  [com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsPoller] (default task-9) Stopping the HystrixMetricsPoller
2016-01-14 07:59:58,473 ERROR [com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet] (default task-9) Failed to write. Will stop polling.: java.lang.NullPointerException
	at io.undertow.server.protocol.http.HttpResponseConduit.write(HttpResponseConduit.java:638)
	at io.undertow.conduits.ChunkedStreamSinkConduit.doWrite(ChunkedStreamSinkConduit.java:163)
	at io.undertow.conduits.ChunkedStreamSinkConduit.write(ChunkedStreamSinkConduit.java:127)
	at org.xnio.conduits.ConduitStreamSinkChannel.write(ConduitStreamSinkChannel.java:150)
	at io.undertow.channels.DetachableStreamSinkChannel.write(DetachableStreamSinkChannel.java:240)
	at io.undertow.server.HttpServerExchange$WriteDispatchChannel.write(HttpServerExchange.java:2000)
	at io.undertow.servlet.spec.ServletOutputStreamImpl.writeBufferBlocking(ServletOutputStreamImpl.java:567)
	at io.undertow.servlet.spec.ServletOutputStreamImpl.flushInternal(ServletOutputStreamImpl.java:482)
	at io.undertow.servlet.spec.ServletOutputStreamImpl.flush(ServletOutputStreamImpl.java:469)
	at io.undertow.servlet.spec.ServletPrintWriter.flush(ServletPrintWriter.java:72)
	at io.undertow.servlet.spec.ServletPrintWriterDelegate.flush(ServletPrintWriterDelegate.java:94)
	at io.undertow.servlet.spec.HttpServletResponseImpl.flushBuffer(HttpServletResponseImpl.java:456)
	at com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet.handleRequest(HystrixMetricsStreamServlet.java:161)
	at com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet.doGet(HystrixMetricsStreamServlet.java:87)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
	at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
	at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
	at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at org.keycloak.adapters.undertow.UndertowAuthenticatedActionsHandler.handleRequest(UndertowAuthenticatedActionsHandler.java:66)
	at org.wildfly.swarm.keycloak.runtime.SecurityContextServletExtension$2$1.handleRequest(SecurityContextServletExtension.java:66)
	at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
	at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.security.handlers.AuthenticationConstraintHandler.handleRequest(AuthenticationConstraintHandler.java:51)
	at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
	at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
	at io.undertow.servlet.handlers.security.ServletSecurityConstraintHandler.handleRequest(ServletSecurityConstraintHandler.java:56)
	at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
	at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
	at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
	at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at org.keycloak.adapters.undertow.ServletPreAuthActionsHandler.handleRequest(ServletPreAuthActionsHandler.java:69)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:284)
	at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:263)
	at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
	at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:174)
	at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202)
	at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:793)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

2016-01-14 07:59:58,483 ERROR [io.undertow.request] (default task-9) UT005071: Undertow request failed HttpServerExchange{ GET /hystrix.stream request {Accept=[text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8], Accept-Language=[en-US,en;q=0.8], Cache-Control=[max-age=0], Accept-Encoding=[gzip, deflate, sdch], User-Agent=[Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36], Connection=[keep-alive], Cookie=[JSESSIONID=U9YWdvjkmqkKON0lwJH_R8vr4SWgmNN9UrEd5Mu7.31569aab92d8], Upgrade-Insecure-Requests=[1], Host=[192.168.99.100]} response {Connection=[keep-alive], Cache-Control=[no-cache, no-store, max-age=0, must-revalidate], Pragma=[no-cache], Transfer-Encoding=[chunked], Content-Type=[text/event-stream;charset=UTF-8], Date=[Thu, 14 Jan 2016 07:59:52 GMT]}}: java.lang.NullPointerException
	at io.undertow.server.protocol.http.HttpResponseConduit.write(HttpResponseConduit.java:638)
	at io.undertow.conduits.ChunkedStreamSinkConduit.doWrite(ChunkedStreamSinkConduit.java:169)
	at io.undertow.conduits.ChunkedStreamSinkConduit.writeFinal(ChunkedStreamSinkConduit.java:237)
	at org.xnio.conduits.ConduitStreamSinkChannel.writeFinal(ConduitStreamSinkChannel.java:104)
	at io.undertow.channels.DetachableStreamSinkChannel.writeFinal(DetachableStreamSinkChannel.java:195)
	at io.undertow.server.HttpServerExchange$WriteDispatchChannel.writeFinal(HttpServerExchange.java:1979)
	at io.undertow.servlet.spec.ServletOutputStreamImpl.writeBufferBlocking(ServletOutputStreamImpl.java:565)
	at io.undertow.servlet.spec.ServletOutputStreamImpl.close(ServletOutputStreamImpl.java:600)
	at io.undertow.servlet.spec.ServletPrintWriter.close(ServletPrintWriter.java:117)
	at io.undertow.servlet.spec.ServletPrintWriterDelegate.close(ServletPrintWriterDelegate.java:99)
	at io.undertow.servlet.spec.HttpServletResponseImpl.closeStreamAndWriter(HttpServletResponseImpl.java:470)
	at io.undertow.servlet.spec.HttpServletResponseImpl.responseDone(HttpServletResponseImpl.java:560)
	at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:331)
	at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:263)
	at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
	at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:174)
	at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202)
	at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:793)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)