Could you please help understand the below mentioned correlated stack traces from the PEGA and Tomcat logs.

PEGA LOG:

2018-01-25 11:15:21,610 [0.140.72-8887-exec-9] [ ] [ ] [ ] (tent.StaticContentResolverImpl) ERROR - Caught unhandled error in StaticContentResolver handling request aInput = {}

com.pega.pegarules.pub.context.RequestorLockException: PRRuntimeException

at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorOrThreadLocked(PRSessionProviderImpl.java:2290)

at com.pega.pegarules.exec.internal.basic.staticcontent.StaticContentResolverImpl.getRequestorHashInfomation(StaticContentResolverImpl.java:691)

at com.pega.pegarules.exec.internal.basic.staticcontent.StaticContentResolverImpl.getRequestorHashInfomation(StaticContentResolverImpl.java:682)

at com.pega.pegarules.exec.internal.basic.staticcontent.StaticContentResolverImpl.processRequest(StaticContentResolverImpl.java:610)

at com.pega.pegarules.exec.internal.basic.staticcontent.StaticContentResolverImpl.processRequest(StaticContentResolverImpl.java:500)

at com.pega.pegarules.exec.internal.basic.staticcontent.StaticContentResolverImpl.processRequest(StaticContentResolverImpl.java:496)

at com.pega.pegarules.web.staticcontent.StaticContentClient.getRequestorHashInfoForThisRequest(StaticContentClient.java:836)

at com.pega.pegarules.web.staticcontent.StaticContentClient.retrieveFile(StaticContentClient.java:408)

at com.pega.pegarules.web.impl.WebStandardImpl.runStaticContentRequest(WebStandardImpl.java:1265)

at com.pega.pegarules.web.impl.WebStandardImpl.doPost(WebStandardImpl.java:344)

at sun.reflect.GeneratedMethodAccessor106.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:367)

at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:408)

at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:223)

at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethod(AppServerBridgeToPega.java:272)

at com.pega.pegarules.internal.web.servlet.WebStandardBoot.doPost(WebStandardBoot.java:121)

at com.pega.pegarules.internal.web.servlet.WebStandardBoot.doGet(WebStandardBoot.java:92)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:612)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)

at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1736)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1695)

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.lang.Thread.run(Unknown Source)

Caused by: java.lang.InterruptedException: Requestor has been destroyed or recycled

at com.pega.pegarules.session.internal.mgmt.PRRequestorImpl.lockAttempt(PRRequestorImpl.java:987)

at com.pega.pegarules.session.internal.PRSessionProviderImpl.getLockOnRequestor(PRSessionProviderImpl.java:1366)

at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorOrThreadLocked(PRSessionProviderImpl.java:2270)

... 40 more

Tomcat log:

Jan 25, 2018 11:15:21 AM com.pega.pegarules.internal.bootstrap.PRBootstrap

SEVERE: Problem during method invocation (doPost)

java.lang.IllegalStateException: removeAttribute: Session already invalidated

at org.apache.catalina.session.StandardSession.removeAttribute(StandardSession.java:1373)

at org.apache.catalina.session.StandardSession.removeAttribute(StandardSession.java:1348)

at org.apache.catalina.session.StandardSessionFacade.removeAttribute(StandardSessionFacade.java:171)

at com.pega.pegarules.web.impl.WebStandardImpl.sendOutput(WebStandardImpl.java:766)

at com.pega.pegarules.web.impl.WebStandardImpl.doPost(WebStandardImpl.java:405)

at sun.reflect.GeneratedMethodAccessor106.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:367)

at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:408)

at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:223)

at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethod(AppServerBridgeToPega.java:272)

at com.pega.pegarules.internal.web.servlet.WebStandardBoot.doPost(WebStandardBoot.java:121)

at com.pega.pegarules.internal.web.servlet.WebStandardBoot.doGet(WebStandardBoot.java:92)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:612)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)

at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1736)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1695)

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.lang.Thread.run(Unknown Source)