Hi Team,

Any idea about the RCA and resolution steps for the below mentioned exception in the Pega Logs.

AppStack : PRPC731,Tomcat 8.3.15 and MSSQL.

2020-04-09 15:13:36,918 [6.17.13-8037-exec-21] [          ] [                    ] [                    ] (sphere.cpr.AtmosphereFramework) ERROR   - AtmosphereFramework exception java.lang.IllegalStateException: A filter or servlet of the current chain does not support asynchronous operations.     at org.apache.catalina.connector.Request.startAsync(Request.java:1646) ~[catalina.jar:8.5.13]     at org.apache.catalina.connector.RequestFacade.startAsync(RequestFacade.java:1038) ~[catalina.jar:8.5.13]     at org.atmosphere.cpr.AtmosphereRequestImpl.startAsync(AtmosphereRequestImpl.java:631) ~[pratmosphere-runtime- Proprietary information hidden.jar:?]     at org.atmosphere.container.Servlet30CometSupport.suspend(Servlet30CometSupport.java:95) ~[pratmosphere-runtime- Proprietary information hidden.jar:?]     at org.atmosphere.container.Servlet30CometSupport.service(Servlet30CometSupport.java:70) ~[pratmosphere-runtime- Proprietary information hidden.jar:?]     at org.atmosphere.cpr.AtmosphereFramework.doCometSupport(AtmosphereFramework.java:2209) ~[pratmosphere-runtime- Proprietary information hidden.jar:?]     at com.pega.pegarules.session.internal.serverpush.atmosphere.AtmospherePushEngine.handleRequestHook(AtmospherePushEngine.java:315) ~[prprivate.jar:?]     at com.pega.pegarules.session.internal.serverpush.AbstractPushEngine.handleRequest(AbstractPushEngine.java:256) ~[prprivate.jar:?]     at com.pega.pegarules.session.internal.engineinterface.service.AsyncRequestAPI.processRequest(AsyncRequestAPI.java:57) ~[prprivate.jar:?]     at com.pega.pegarules.session.internal.engineinterface.service.AsyncRequestAPI.invoke(AsyncRequestAPI.java:34) ~[prprivate.jar:?]     at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl._invokeEngine_privact(EngineImpl.java:331) ~[prprivate.jar:?]     at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.invokeEngine(EngineImpl.java:274) ~[prprivate.jar:?]     at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.invokeEngine(EngineImpl.java:251) ~[prprivate.jar:?]     at com.pega.pegarules.priv.context.JNDIEnvironment.invokeEngineInner(JNDIEnvironment.java:278) ~[prpublic.jar:?]     at com.pega.pegarules.priv.context.JNDIEnvironment.invokeEngine(JNDIEnvironment.java:223) ~[prpublic.jar:?]     at com.pega.pegarules.web.impl.WebStandardImpl.makeEtierRequest(WebStandardImpl.java:685) ~[prwebj2ee.jar:?]     at com.pega.pegarules.web.impl.WebStandardImpl.doPost(WebStandardImpl.java:400) ~[prwebj2ee.jar:?]     at sun.reflect.GeneratedMethodAccessor106.invoke(Unknown Source) ~[?:?]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_181]     at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_181]     at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:370) ~[prbootstrap-7.2.2-117.jar:7.2.2-117]     at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:411) ~[prbootstrap-7.2.2-117.jar:7.2.2-117]     at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:224) ~[prbootstrap-api-7.2.2-117.jar:7.2.2-117]     at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethod(AppServerBridgeToPega.java:273) ~[prbootstrap-api-7.2.2-117.jar:7.2.2-117]     at com.pega.pegarules.internal.web.servlet.WebStandardBoot.doPost(WebStandardBoot.java:121) ~[prbootstrap-api-7.2.2-117.jar:7.2.2-117]     at com.pega.pegarules.internal.web.servlet.WebStandardBoot.doGet(WebStandardBoot.java:92) ~[prbootstrap-api-7.2.2-117.jar:7.2.2-117]     at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) ~[servlet-api.jar:?]     at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[servlet-api.jar:?]     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230) ~[catalina.jar:8.5.13]     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[catalina.jar:8.5.13]     at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-websocket.jar:8.5.13]     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[catalina.jar:8.5.13]     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[catalina.jar:8.5.13]     at org.apache.catalina.filters.ExpiresFilter.doFilter(ExpiresFilter.java:1230) ~[catalina.jar:8.5.13]     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[catalina.jar:8.5.13]     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[catalina.jar:8.5.13]     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) ~[catalina.jar:8.5.13]     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[catalina.jar:8.5.13]     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:595) ~[catalina.jar:8.5.13]     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) ~[catalina.jar:8.5.13]     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80) ~[catalina.jar:8.5.13]     at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624) ~[catalina.jar:8.5.13]     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) ~[catalina.jar:8.5.13]     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341) ~[catalina.jar:8.5.13]     at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799) ~[tomcat-coyote.jar:8.5.13]     at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) ~[tomcat-coyote.jar:8.5.13]     at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861) ~[tomcat-coyote.jar:8.5.13]     at org.apache.tomcat.util.net.Nio2Endpoint$SocketProcessor.doRun(Nio2Endpoint.java:1697) ~[tomcat-coyote.jar:8.5.13]     at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-coyote.jar:8.5.13]     at org.apache.tomcat.util.net.AbstractEndpoint.processSocket(AbstractEndpoint.java:934) ~[tomcat-coyote.jar:8.5.13]     at org.apache.tomcat.util.net.Nio2Endpoint$Nio2SocketWrapper$4.completed(Nio2Endpoint.java:626) ~[tomcat-coyote.jar:8.5.13]     at org.apache.tomcat.util.net.Nio2Endpoint$Nio2SocketWrapper$4.completed(Nio2Endpoint.java:604) ~[tomcat-coyote.jar:8.5.13]     at org.apache.tomcat.util.net.SecureNio2Channel$1.completed(SecureNio2Channel.java:877) ~[tomcat-coyote.jar:8.5.13]     at org.apache.tomcat.util.net.SecureNio2Channel$1.completed(SecureNio2Channel.java:810) ~[tomcat-coyote.jar:8.5.13]     at sun.nio.ch.Invoker.invokeUnchecked(Unknown Source) ~[?:1.8.0_181]     at sun.nio.ch.Invoker$2.run(Unknown Source) ~[?:1.8.0_181]     at sun.nio.ch.AsynchronousChannelGroupImpl$1.run(Unknown Source) ~[?:1.8.0_181]     at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_181]     at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_181]     at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-util.jar:8.5.13]     at java.lang.Thread.run(Unknown Source) [?:1.8.0_181]