Openhab.log: java.lang.NullPointerException / An I/O error has occurred while writing a response message entity to the container output stream

Tags: #<Tag:0x00007efebb389440> #<Tag:0x00007efebb389350> #<Tag:0x00007efebb389260>
  • Platform information:
    • Hardware: RaspberryPi
    • OS: Raspian 4.19.66
    • Java Runtime Environment: openJDK 1.8.0_181
    • openHAB version: 2.5.4

Dear all,
every few seconds I have a java exception in openhab.log regarding a NullPointerException

2020-05-08 08:30:56.043 [ERROR] [ersey.server.ServerRuntime$Responder] - An I/O error has occurred while writing a response message entity to the container output stream. org.glassfish.jersey.server.internal.process.MappableException: java.lang.NullPointerException at org.glassfish.jersey.server.internal.MappableExceptionWrapperInterceptor.aroundWriteTo(MappableExceptionWrapperInterceptor.java:92) ~[?:?] at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162) ~[bundleFile:?] at org.glassfish.jersey.message.internal.MessageBodyFactory.writeTo(MessageBodyFactory.java:1130) ~[bundleFile:?] at org.glassfish.jersey.server.ServerRuntime$Responder.writeResponse(ServerRuntime.java:711) [bundleFile:?] at org.glassfish.jersey.server.ServerRuntime$Responder.processResponse(ServerRuntime.java:444) [bundleFile:?] at org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:434) [bundleFile:?] at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:329) [bundleFile:?] at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) [bundleFile:?] at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) [bundleFile:?] at org.glassfish.jersey.internal.Errors.process(Errors.java:315) [bundleFile:?] at org.glassfish.jersey.internal.Errors.process(Errors.java:297) [bundleFile:?] at org.glassfish.jersey.internal.Errors.process(Errors.java:267) [bundleFile:?] at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317) [bundleFile:?] at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305) [bundleFile:?] at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154) [bundleFile:?] at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473) [bundleFile:?] at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427) [bundleFile:?] at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388) [bundleFile:?] at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341) [bundleFile:?] at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228) [bundleFile:?] at com.eclipsesource.jaxrs.publisher.internal.ServletContainerBridge.service(ServletContainerBridge.java:76) [bundleFile:?] at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:852) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:544) [bundleFile:9.4.20.v20190813] at org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:71) [bundleFile:?] at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:536) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1581) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1307) [bundleFile:9.4.20.v20190813] at org.ops4j.pax.web.service.jetty.internal.HttpServiceContext.doHandle(HttpServiceContext.java:293) [bundleFile:?] at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:482) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1549) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1204) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) [bundleFile:9.4.20.v20190813] at org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:80) [bundleFile:?] at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.server.Server.handle(Server.java:494) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:374) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:268) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:367) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:782) [bundleFile:9.4.20.v20190813] at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:918) [bundleFile:9.4.20.v20190813] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_181] Caused by: java.lang.NullPointerException at org.openhab.transform.scale.internal.ScaleTransformationService.lambda$0(ScaleTransformationService.java:132) ~[?:?] at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:174) ~[?:1.8.0_181] at java.util.Spliterators$IteratorSpliterator.tryAdvance(Spliterators.java:1812) ~[?:1.8.0_181] at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126) ~[?:1.8.0_181] at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:498) ~[?:1.8.0_181] at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:485) ~[?:1.8.0_181] at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[?:1.8.0_181] at java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:152) ~[?:1.8.0_181] at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_181] at java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:464) ~[?:1.8.0_181] at org.openhab.transform.scale.internal.ScaleTransformationService.getScaleResult(ScaleTransformationService.java:132) ~[?:?] at org.openhab.transform.scale.internal.ScaleTransformationService.formatResult(ScaleTransformationService.java:126) ~[?:?] at org.openhab.transform.scale.internal.ScaleTransformationService.internalTransform(ScaleTransformationService.java:105) ~[?:?] at org.openhab.transform.scale.internal.ScaleTransformationService.internalTransform(ScaleTransformationService.java:1) ~[?:?] at org.eclipse.smarthome.core.transform.AbstractFileTransformationService.transform(AbstractFileTransformationService.java:138) ~[?:?] at org.eclipse.smarthome.core.transform.TransformationHelper.transform(TransformationHelper.java:125) ~[?:?] at org.eclipse.smarthome.core.transform.TransformationHelper.transform(TransformationHelper.java:100) ~[?:?] at org.eclipse.smarthome.io.rest.core.item.EnrichedItemDTOMapper.considerTransformation(EnrichedItemDTOMapper.java:124) ~[?:?] at org.eclipse.smarthome.io.rest.core.item.EnrichedItemDTOMapper.map(EnrichedItemDTOMapper.java:67) ~[?:?] at org.eclipse.smarthome.io.rest.core.item.EnrichedItemDTOMapper.map(EnrichedItemDTOMapper.java:61) ~[?:?] at org.eclipse.smarthome.io.rest.core.internal.item.ItemResource.lambda$0(ItemResource.java:230) ~[?:?] at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[?:1.8.0_181] at java.util.HashMap$KeySpliterator.tryAdvance(HashMap.java:1574) ~[?:1.8.0_181] at java.util.stream.StreamSpliterators$WrappingSpliterator.lambda$initPartialTraversalState$0(StreamSpliterators.java:294) ~[?:1.8.0_181] at java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.fillBuffer(StreamSpliterators.java:206) ~[?:1.8.0_181] at java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.doAdvance(StreamSpliterators.java:169) ~[?:1.8.0_181] at java.util.stream.StreamSpliterators$WrappingSpliterator.tryAdvance(StreamSpliterators.java:300) ~[?:1.8.0_181] at java.util.Spliterators$1Adapter.hasNext(Spliterators.java:681) ~[?:1.8.0_181] at org.eclipse.smarthome.io.rest.Stream2JSONInputStream.fillBuffer(Stream2JSONInputStream.java:93) ~[?:?] at org.eclipse.smarthome.io.rest.Stream2JSONInputStream.read(Stream2JSONInputStream.java:69) ~[?:?] at java.io.InputStream.read(InputStream.java:179) ~[?:1.8.0_181] at java.io.InputStream.read(InputStream.java:101) ~[?:1.8.0_181] at org.glassfish.jersey.message.internal.ReaderWriter.writeTo(ReaderWriter.java:115) ~[bundleFile:?] at org.glassfish.jersey.message.internal.AbstractMessageReaderWriterProvider.writeTo(AbstractMessageReaderWriterProvider.java:79) ~[bundleFile:?] at org.glassfish.jersey.message.internal.InputStreamProvider.writeTo(InputStreamProvider.java:105) ~[bundleFile:?] at org.glassfish.jersey.message.internal.InputStreamProvider.writeTo(InputStreamProvider.java:60) ~[bundleFile:?] at org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.invokeWriteTo(WriterInterceptorExecutor.java:265) ~[bundleFile:?] at org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.aroundWriteTo(WriterInterceptorExecutor.java:250) ~[bundleFile:?] at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162) ~[bundleFile:?] at org.glassfish.jersey.server.internal.JsonWithPaddingInterceptor.aroundWriteTo(JsonWithPaddingInterceptor.java:106) ~[?:?] at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162) ~[bundleFile:?] at org.glassfish.jersey.server.internal.MappableExceptionWrapperInterceptor.aroundWriteTo(MappableExceptionWrapperInterceptor.java:86) ~[?:?] ... 53 more

This is really annoying and disturbs any overview at the system activities.
But I can’t find the reason for this error, nor any useful hints via google.

I already deleted the cache via openhab-cli but nothing changed.

Where to start? How can I get rid of this error?

sincerly
wbuh

Have you tried 2-3 restarts of OH, allowing time for OH to fully start between each restart?

Use sudo systemctl restart openhab2 and keep a browser with frontail open so you can watch the logs.

This is most often about a UI.
Usually it’s about a UI left over from a previous openHAB boot, still trying to communicate with old OH instance.
A browser refresh would shift it.

Done that. I closed firefox and restarted a few times. Did not work.
In the meantime I think this issue is in relation to my other problem, that the items are not loaded into paperUI Control.
Paper UI Control stays empty