Hello, I am working on troubleshooting an issue where I am seeing the following Stack trace in a set of logs. Once this first message occurs, thousands of the same message are logged for several hours. I am trying to track down the origin of the issue. The issue is in the ExpiresFilter where the servletOutputStream in the XServletOutputStream inner class is null. I am not sure if that is the root cause of the issue or something else that has happened to cause this. I have spent several hours trying to reproduce the issue, but unsuccessful. However, it has been seen several times. I am thinking it is actually related to a resource expiring because it usually manifests on a Monday morning after a weekend of being idle. The expiresFilter settings in Tomcat are the default settings.
Tomcat Server Version information Server version name: Apache Tomcat/8.5.54 Server built: Apr 3 2020 14:06:10 UTC Server version number: 8.5.54.0 OS Name: Linux OS Version: 4.14.173-137.228.amzn2.x86_64 Architecture: amd64 JVM Version: 1.8.0_202-b08 [2021/04/26 10:58:15.486][ INFO][com.loftware.comet.modelstatus.ModelStatusConsumer](ActiveMQ Session Task-50127) Exception handling the message: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.NullPointerException java.lang.RuntimeException: java.lang.RuntimeException: java.lang.NullPointerException at org.atmosphere.cpr.AtmosphereResponseImpl.write(AtmosphereResponseImpl.java:812) ~[atmosphere-runtime-2.4.24.jar:2.4.24] at org.atmosphere.cpr.AtmosphereResponseImpl.write(AtmosphereResponseImpl.java:784) ~[atmosphere-runtime-2.4.24.jar:2.4.24] at org.atmosphere.cpr.AtmosphereResourceImpl.write(AtmosphereResourceImpl.java:592) ~[atmosphere-runtime-2.4.24.jar:2.4.24] at com.loftware.comet.modelstatus.ModelStatusConsumer.onMessage(ModelStatusConsumer.java:145) [classes/:2019.3.4-9-1] at org.apache.activemq.ActiveMQMessageConsumer.dispatch(ActiveMQMessageConsumer.java:1404) [activemq-client-5.15.10.jar:5.15.10] at org.apache.activemq.ActiveMQSessionExecutor.dispatch(ActiveMQSessionExecutor.java:131) [activemq-client-5.15.10.jar:5.15.10] at org.apache.activemq.ActiveMQSessionExecutor.iterate(ActiveMQSessionExecutor.java:202) [activemq-client-5.15.10.jar:5.15.10] at org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:133) [activemq-client-5.15.10.jar:5.15.10] at org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:48) [activemq-client-5.15.10.jar:5.15.10] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_202] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_202] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_202] Caused by: java.lang.RuntimeException: java.lang.NullPointerException at org.atmosphere.cpr.AtmosphereResponseImpl.write(AtmosphereResponseImpl.java:812) ~[atmosphere-runtime-2.4.24.jar:2.4.24] at org.atmosphere.cpr.AtmosphereResponseImpl.write(AtmosphereResponseImpl.java:784) ~[atmosphere-runtime-2.4.24.jar:2.4.24] at org.atmosphere.cpr.AtmosphereInterceptorWriter.writeReady(AtmosphereInterceptorWriter.java:92) ~[atmosphere-runtime-2.4.24.jar:2.4.24] at org.atmosphere.cpr.AtmosphereInterceptorWriter.invokeInterceptor(AtmosphereInterceptorWriter.java:83) ~[atmosphere-runtime-2.4.24.jar:2.4.24] at org.atmosphere.cpr.AtmosphereInterceptorWriter.write(AtmosphereInterceptorWriter.java:69) ~[atmosphere-runtime-2.4.24.jar:2.4.24] at org.atmosphere.cpr.AtmosphereInterceptorWriter.write(AtmosphereInterceptorWriter.java:64) ~[atmosphere-runtime-2.4.24.jar:2.4.24] at org.atmosphere.cpr.AtmosphereResponseImpl$Stream.write(AtmosphereResponseImpl.java:957) ~[atmosphere-runtime-2.4.24.jar:2.4.24] at org.atmosphere.cpr.AtmosphereResponseImpl.write(AtmosphereResponseImpl.java:803) ~[atmosphere-runtime-2.4.24.jar:2.4.24] ... 11 more Caused by: java.lang.NullPointerException at org.apache.coyote.http11.Http11OutputBuffer$SocketOutputBuffer.doWrite(Http11OutputBuffer.java:623) ~[tomcat-coyote.jar:8.5.54] at org.apache.coyote.http11.filters.ChunkedOutputFilter.doWrite(ChunkedOutputFilter.java:119) ~[tomcat-coyote.jar:8.5.54] at org.apache.coyote.http11.Http11OutputBuffer.doWrite(Http11OutputBuffer.java:225) ~[tomcat-coyote.jar:8.5.54] at org.apache.coyote.Response.doWrite(Response.java:600) ~[tomcat-coyote.jar:8.5.54] at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:360) ~[catalina.jar:8.5.54] at org.apache.catalina.connector.OutputBuffer.flushByteBuffer(OutputBuffer.java:841) ~[catalina.jar:8.5.54] at org.apache.catalina.connector.OutputBuffer.append(OutputBuffer.java:746) ~[catalina.jar:8.5.54] at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:407) ~[catalina.jar:8.5.54] at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:385) ~[catalina.jar:8.5.54] at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:96) ~[catalina.jar:8.5.54] at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:89) ~[catalina.jar:8.5.54] at org.springframework.security.web.context.SaveContextOnUpdateOrErrorResponseWrapper$SaveContextServletOutputStream.write(SaveContextOnUpdateOrErrorResponseWrapper.java:453) ~[spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.apache.catalina.filters.ExpiresFilter$XServletOutputStream.write(ExpiresFilter.java:1006) ~[catalina.jar:8.5.54] at org.atmosphere.cpr.AtmosphereResponseImpl.write(AtmosphereResponseImpl.java:803) ~[atmosphere-runtime-2.4.24.jar:2.4.24] at org.atmosphere.cpr.AtmosphereResponseImpl.write(AtmosphereResponseImpl.java:784) ~[atmosphere-runtime-2.4.24.jar:2.4.24] at org.atmosphere.cpr.AtmosphereInterceptorWriter.writeReady(AtmosphereInterceptorWriter.java:92) ~[atmosphere-runtime-2.4.24.jar:2.4.24] at org.atmosphere.cpr.AtmosphereInterceptorWriter.invokeInterceptor(AtmosphereInterceptorWriter.java:83) ~[atmosphere-runtime-2.4.24.jar:2.4.24] at org.atmosphere.cpr.AtmosphereInterceptorWriter.write(AtmosphereInterceptorWriter.java:69) ~[atmosphere-runtime-2.4.24.jar:2.4.24] at org.atmosphere.cpr.AtmosphereInterceptorWriter.write(AtmosphereInterceptorWriter.java:64) ~[atmosphere-runtime-2.4.24.jar:2.4.24] at org.atmosphere.cpr.AtmosphereResponseImpl$Stream.write(AtmosphereResponseImpl.java:957) ~[atmosphere-runtime-2.4.24.jar:2.4.24] at org.atmosphere.cpr.AtmosphereResponseImpl.write(AtmosphereResponseImpl.java:803) ~[atmosphere-runtime-2.4.24.jar:2.4.24] ... 11 more Any help on ideas of what could be causing it would be greatly appreciated. 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