Restored backup, logs full of errors

Hi there!
Today I had the luck that the SD card in my Raspberry Pi openhab server got corrupted and Openhab simply stopped working. Luckily I used the backup script (the one included with Openhab) to backup my configuration just two days ago. So I just decided to reinstall everything (so fresh install of the latest Openhabian version). After the OS updates and openhab updates (I was running the latest stable 2.4 version of Openhab both when I made the backup and now) I restored the config, and after a few cache cleans and reboots everything started working again.

Everything is now working normally except two things (and I am pretty sure they are related):

  • Basic UI is showing me error: “Offline: waiting for connection to become available” all the time. Everything works just fine, except that error message is there
  • Console is full of these messages:
2019-02-23 21:58:14.403 [WARN ] [org.eclipse.jetty.server.HttpChannel] - /rest/sitemaps/events/694d9cf3-dfe4-4fa4-8386-352a82dcfe39

javax.servlet.ServletException: javax.servlet.ServletException: java.lang.UnsupportedOperationException: Asynchronous processing not supported on Servlet 2.x container.

	at org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:88) ~[?:?]

	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) ~[84:org.eclipse.jetty.server:9.4.11.v20180605]

	at org.eclipse.jetty.server.Server.handle(Server.java:531) ~[84:org.eclipse.jetty.server:9.4.11.v20180605]

	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352) [84:org.eclipse.jetty.server:9.4.11.v20180605]

	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260) [84:org.eclipse.jetty.server:9.4.11.v20180605]

	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281) [75:org.eclipse.jetty.io:9.4.11.v20180605]

	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102) [75:org.eclipse.jetty.io:9.4.11.v20180605]

	at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118) [75:org.eclipse.jetty.io:9.4.11.v20180605]

	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333) [87:org.eclipse.jetty.util:9.4.11.v20180605]

	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310) [87:org.eclipse.jetty.util:9.4.11.v20180605]

	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168) [87:org.eclipse.jetty.util:9.4.11.v20180605]

	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126) [87:org.eclipse.jetty.util:9.4.11.v20180605]

	at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366) [87:org.eclipse.jetty.util:9.4.11.v20180605]

	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:762) [87:org.eclipse.jetty.util:9.4.11.v20180605]

	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:680) [87:org.eclipse.jetty.util:9.4.11.v20180605]

	at java.lang.Thread.run(Thread.java:748) [?:?]

Caused by: javax.servlet.ServletException: java.lang.UnsupportedOperationException: Asynchronous processing not supported on Servlet 2.x container.

	at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:489) ~[169:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]

	at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427) ~[169:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]

	at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388) ~[169:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]

	at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341) ~[169:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]

	at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228) ~[169:org.glassfish.jersey.containers.jersey-container-servlet-core:2.22.2]

	at com.eclipsesource.jaxrs.publisher.internal.ServletContainerBridge.service(ServletContainerBridge.java:76) ~[?:?]

	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:865) ~[85:org.eclipse.jetty.servlet:9.4.11.v20180605]

	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:535) ~[85:org.eclipse.jetty.servlet:9.4.11.v20180605]

	at org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:71) ~[?:?]

	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146) ~[84:org.eclipse.jetty.server:9.4.11.v20180605]

	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548) ~[82:org.eclipse.jetty.security:9.4.11.v20180605]

	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) ~[84:org.eclipse.jetty.server:9.4.11.v20180605]

	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257) ~[84:org.eclipse.jetty.server:9.4.11.v20180605]

	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595) ~[84:org.eclipse.jetty.server:9.4.11.v20180605]

	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255) ~[84:org.eclipse.jetty.server:9.4.11.v20180605]

	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1317) ~[84:org.eclipse.jetty.server:9.4.11.v20180605]

	at org.ops4j.pax.web.service.jetty.internal.HttpServiceContext.doHandle(HttpServiceContext.java:293) ~[?:?]

	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203) ~[84:org.eclipse.jetty.server:9.4.11.v20180605]

	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473) ~[85:org.eclipse.jetty.servlet:9.4.11.v20180605]

	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564) ~[84:org.eclipse.jetty.server:9.4.11.v20180605]

	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201) ~[84:org.eclipse.jetty.server:9.4.11.v20180605]

	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1219) ~[84:org.eclipse.jetty.server:9.4.11.v20180605]

	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144) ~[84:org.eclipse.jetty.server:9.4.11.v20180605]

	at org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:80) ~[?:?]

	... 15 more

Basically they appear almost every second and they make the log absolutely useless. So any ideas on how to get rid of this?