Hello,

I got a Null Pointer Exception on the production server today. Below is the stack trace found in the PegaRULES.log.

The operation team didn't get any issue reports from end users, so the steps to reproduce the issue are unknown.

What might be the possible cause for this curious NPE ?

2018-05-08 10:28:44,763 [ WebContainer : 6] [TABTHREAD2] [ ] [ AppName:01.02.01] (ngineinterface.service.HttpAPI) ERROR hostname|ipaddress userid - client ip address: com.pega.pegarules.pub.PRRuntimeError

com.pega.pegarules.pub.PRRuntimeError: PRRuntimeError

at com.pega.pegarules.session.internal.mgmt.base.ThreadRunner.runActivitiesAlt(ThreadRunner.java:712)

at com.pega.pegarules.session.internal.mgmt.PRThreadImpl.runActivitiesAlt(PRThreadImpl.java:465)

at com.pega.pegarules.session.internal.engineinterface.service.HttpAPI.runActivities(HttpAPI.java:3203)

at com.pega.pegarules.session.external.engineinterface.service.EngineAPI.processRequestInner(EngineAPI.java:391)

at sun.reflect.GeneratedMethodAccessor51.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)

at java.lang.reflect.Method.invoke(Method.java:508)

at com.pega.pegarules.session.internal.PRSessionProviderImpl.performTargetActionWithLock(PRSessionProviderImpl.java:1297)

at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:1034)

at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:889)

at com.pega.pegarules.session.external.engineinterface.service.EngineAPI.processRequest(EngineAPI.java:331)

at com.pega.pegarules.session.internal.engineinterface.service.HttpAPI.invoke(HttpAPI.java:829)

at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl._invokeEngine_privact(EngineImpl.java:331)

at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.invokeEngine(EngineImpl.java:274)

at com.pega.pegarules.session.internal.engineinterface.etier.ejb.EngineBean.invokeEngine(EngineBean.java:225)

at sun.reflect.GeneratedMethodAccessor28.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)

at java.lang.reflect.Method.invoke(Method.java:508)

at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:370)

at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:411)

at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:224)

at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingException(AppServerBridgeToPega.java:246)

at com.pega.pegarules.internal.etier.ejb.EngineBeanBoot.invokeEngine(EngineBeanBoot.java:168)

at com.pega.pegarules.internal.etier.interfaces.EJSLocalStatelessEngineBMT_f2439d86.invokeEngine(Unknown Source)

at com.pega.pegarules.priv.context.JNDIEnvironment.invokeEngineInner(JNDIEnvironment.java:278)

at com.pega.pegarules.priv.context.JNDIEnvironment.invokeEngine(JNDIEnvironment.java:223)

at com.pega.pegarules.web.impl.WebStandardImpl.makeEtierRequest(WebStandardImpl.java:589)

at com.pega.pegarules.web.impl.WebStandardImpl.doPost(WebStandardImpl.java:378)

at sun.reflect.GeneratedMethodAccessor50.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)

at java.lang.reflect.Method.invoke(Method.java:508)

at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:370)

at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:411)

at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:224)

at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethod(AppServerBridgeToPega.java:273)

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

at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)

at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1233)

at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:782)

at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:481)

at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:178)

at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1114)

at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:87)

at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:949)

at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1817)

at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:200)

at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:463)

at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:530)

at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:316)

at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:88)

at com.ibm.ws.ssl.channel.impl.SSLReadServiceContext$SSLReadCompletedCallback.complete(SSLReadServiceContext.java:1820)

at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:175)

at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)

at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)

at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)

at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)

at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)

at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)

at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1892)

Caused by:

java.lang.NullPointerException

at com.pegarules.generated.activity.ra_action_pzdogridaction_84f3e7348d7bf2bad1ec28065f8afa87.step1_circum0(ra_action_pzdogridaction_84f3e7348d7bf2bad1ec28065f8afa87.java:355)

at com.pegarules.generated.activity.ra_action_pzdogridaction_84f3e7348d7bf2bad1ec28065f8afa87.perform(ra_action_pzdogridaction_84f3e7348d7bf2bad1ec28065f8afa87.java:70)

at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3553)

at com.pegarules.generated.activity.ra_action_reloadsection_2a07dae44b0da69c8dd529e9fcfd3cfb.step5_circum0(ra_action_reloadsection_2a07dae44b0da69c8dd529e9fcfd3cfb.java:739)

at com.pegarules.generated.activity.ra_action_reloadsection_2a07dae44b0da69c8dd529e9fcfd3cfb.perform(ra_action_reloadsection_2a07dae44b0da69c8dd529e9fcfd3cfb.java:138)

at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3553)

at com.pega.pegarules.session.internal.mgmt.base.ThreadRunner.runActivitiesAlt(ThreadRunner.java:646)

... 59 more