Jetty.project: [9.4.12] java.util.concurrent.TimeoutException: Idle timeout expired: 30000/30000 ms

[Vod9nou]

Hello, dear developers.
Can you help to understand what happened.
We have a weak internet connection to the server (several proxies). And, when loading some content in the microservice, we get this error.

What does this timeout affect, how can I raise it using application.yaml Spring BOOT, and how can I avoid this error?
Thank you in advance!

java.util.concurrent.TimeoutException: Idle timeout expired: 30000/30000 ms

java.io.IOException: java.util.concurrent.TimeoutException: Idle timeout expired: 30000/30000 ms
    at org.eclipse.jetty.util.SharedBlockingCallback$Blocker.block(SharedBlockingCallback.java:235) [jetty-util-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.server.HttpOutput.write(HttpOutput.java:216) ~[jetty-server-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.server.HttpOutput.write(HttpOutput.java:514) ~[jetty-server-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.springframework.cloud.sleuth.instrument.web.TraceServletOutputStream.write(TraceServletOutputStream.java:120) ~[spring-cloud-sleuth-core-1.2.6.RELEASE.jar!/:1.2.6.RELEASE]
    at org.springframework.security.web.util.OnCommittedResponseWrapper$SaveContextServletOutputStream.write(OnCommittedResponseWrapper.java:639) ~[spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at com.fasterxml.jackson.core.json.UTF8JsonGenerator._flushBuffer(UTF8JsonGenerator.java:2039) ~[jackson-core-2.8.11.jar!/:2.8.11]
    at com.fasterxml.jackson.core.json.UTF8JsonGenerator._writeStringSegment2(UTF8JsonGenerator.java:1354) ~[jackson-core-2.8.11.jar!/:2.8.11]
    at com.fasterxml.jackson.core.json.UTF8JsonGenerator._writeStringSegment(UTF8JsonGenerator.java:1301) ~[jackson-core-2.8.11.jar!/:2.8.11]
    at com.fasterxml.jackson.core.json.UTF8JsonGenerator.writeString(UTF8JsonGenerator.java:457) ~[jackson-core-2.8.11.jar!/:2.8.11]
    at com.fasterxml.jackson.databind.ser.std.StringSerializer.serialize(StringSerializer.java:49) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFieldsUsing(MapSerializer.java:736) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:534) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:30) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:704) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:689) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serializeContents(IndexedListSerializer.java:119) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize(IndexedListSerializer.java:79) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize(IndexedListSerializer.java:18) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:704) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:689) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serializeContents(IndexedListSerializer.java:119) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize(IndexedListSerializer.java:79) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize(IndexedListSerializer.java:18) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:704) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:689) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:149) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:112) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:25) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:704) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:689) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serializeContents(IndexedListSerializer.java:119) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize(IndexedListSerializer.java:79) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize(IndexedListSerializer.java:18) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:704) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:689) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:292) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1429) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:951) ~[jackson-databind-2.8.11.2.jar!/:2.8.11.2]
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:285) ~[spring-web-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.http.converter.AbstractGenericHttpMessageConverter.write(AbstractGenericHttpMessageConverter.java:106) ~[spring-web-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:231) ~[spring-webmvc-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:174) ~[spring-webmvc-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:81) ~[spring-web-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:113) ~[spring-webmvc-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:849) ~[spring-webmvc-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:760) ~[spring-webmvc-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967) ~[spring-webmvc-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) ~[spring-webmvc-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) ~[spring-webmvc-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) ~[spring-webmvc-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) ~[javax.servlet-api-3.1.0.jar!/:3.1.0]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) ~[spring-webmvc-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) ~[javax.servlet-api-3.1.0.jar!/:3.1.0]
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:865) ~[jetty-servlet-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1655) [jetty-servlet-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55) [spring-boot-1.5.17.RELEASE.jar!/:1.5.17.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationProcessingFilter.doFilter(OAuth2AuthenticationProcessingFilter.java:176) [spring-security-oauth2-2.0.16.RELEASE.jar!/:na]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:66) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177) [spring-security-web-4.2.9.RELEASE.jar!/:4.2.9.RELEASE]
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:111) [spring-boot-actuator-1.5.17.RELEASE.jar!/:1.5.17.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) [spring-web-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) [spring-web-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) [spring-web-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.springframework.cloud.sleuth.instrument.web.TraceFilter.doFilter(TraceFilter.java:186) [spring-cloud-sleuth-core-1.2.6.RELEASE.jar!/:1.2.6.RELEASE]
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) [spring-web-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:103) [spring-boot-actuator-1.5.17.RELEASE.jar!/:1.5.17.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.20.RELEASE.jar!/:4.3.20.RELEASE]
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533) [jetty-servlet-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146) [jetty-server-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548) [jetty-security-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) [jetty-server-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257) [jetty-server-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595) [jetty-server-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255) [jetty-server-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1340) [jetty-server-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203) [jetty-server-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473) [jetty-servlet-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564) [jetty-server-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201) [jetty-server-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1242) [jetty-server-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144) [jetty-server-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) [jetty-server-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.server.Server.handle(Server.java:503) [jetty-server-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:364) [jetty-server-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260) [jetty-server-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305) [jetty-io-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) [jetty-io-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118) [jetty-io-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333) [jetty-util-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310) [jetty-util-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168) [jetty-util-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126) [jetty-util-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366) [jetty-util-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765) [jetty-util-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683) [jetty-util-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]
Caused by: java.util.concurrent.TimeoutException: Idle timeout expired: 30000/30000 ms
    at org.eclipse.jetty.io.IdleTimeout.checkIdleTimeout(IdleTimeout.java:166) ~[jetty-io-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at org.eclipse.jetty.io.IdleTimeout$1.run(IdleTimeout.java:50) ~[jetty-io-9.4.12.v20180830.jar!/:9.4.12.v20180830]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_131]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_131]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) ~[na:1.8.0_131]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) ~[na:1.8.0_131]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_131]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_131]
    ... 1 common frames omitted

[olamy]

Please use user mailing list to ask questions.
GitHub is used for issues only.
https://www.eclipse.org/jetty/mailinglists.html

[sbordet]

@Vod9nou the stack trace indicates that the server was writing some content, but the TCP connection got congested, so the write blocked.

To unblock the congestion, the client must read (and communicate that to the server via TCP ACKs).

Apparently this did not happen for 30 seconds, so Jetty closed the connection due to idle timeout.

As for configuring the idle timeout to a larger value, you should ask to the Spring Boot Project.

Using the code you would do:

Server server = ...;
ServerConnector connector = new ServerConnector(server, ...);
connector.setIdleTimeout(60 * 1000);