ninja.AssetsController | error streaming file

[Masanori Nakase]

The logger reports suddenly but often an IOException and its stack trace. Every asset is successfully rendered on the web browser. The images are drawn and the CSS styles are applied. It seems that the IOException is caught and can be handled no longer. What should I do to erase this error log?   

2020-10-04 08:08:52.129 | [1853235632@qtp-589873731-2] | ninja.AssetsController | error streaming file

java.io.IOException: Closed

at org.mortbay.jetty.AbstractGenerator$Output.write(AbstractGenerator.java:632)

at org.mortbay.jetty.AbstractGenerator$Output.write(AbstractGenerator.java:580)

at com.google.common.io.ByteStreams.copy(ByteStreams.java:113)

at ninja.AssetsController.streamOutUrlEntity(AssetsController.java:154)

at ninja.AssetsController.access$200(AssetsController.java:45)

at ninja.AssetsController$1.render(AssetsController.java:95)

at ninja.utils.ResultHandler.handleRenderable(ResultHandler.java:87)

at ninja.utils.ResultHandler.handleResult(ResultHandler.java:60)

at ninja.NinjaDefault.onRouteRequest(NinjaDefault.java:111)

at conf.Ninja.onRouteRequest(Ninja.java:68)

at ninja.servlet.NinjaServletDispatcher.service(NinjaServletDispatcher.java:86)

at com.google.inject.servlet.ServletDefinition.doServiceImpl(ServletDefinition.java:290)

at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:280)

at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:184)

at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:89)

at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:85)

at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:121)

at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:133)

at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)

at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)

at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)

at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)

at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)

at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)

at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)

at org.mortbay.jetty.Server.handle(Server.java:326)

at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)

at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)

at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)

at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)

at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)

at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)

at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)