# Pega 8.4.4 PreProd staging UAT post upgrade startup hazelcast configuration class not found error **URL:** \ **Category:** General\ **Tags:** updates, 8-4-4, dev-designer-studio, healthcare-and-life-sciences, lead-system-architect\ **Created:** [November 19, 2021, 10:05pm UTC](https://forums.pega.com/t/pega-8-4-4-preprod-staging-uat-post-upgrade-startup-hazelcast-configuration-class-not-found-error/1914 "2021-11-19T22:05:35Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![SENTHILM](https://avatars.discourse-cdn.com/v4/letter/s/43a26b/32.png) [@SENTHILM](https://forums.pega.com/u/SENTHILM)\ **Post date:** [November 19, 2021, 10:05pm UTC](https://forums.pega.com/t/pega-8-4-4-preprod-staging-uat-post-upgrade-startup-hazelcast-configuration-class-not-found-error/1914/1 "2021-11-19T22:05:35Z")
**RESOLVED** - I have searched pega community forum for similar issue and did not find any. So thought of sharing the root cause for other members reference. **Issue:** Pega 8.4.4 instance running in tomcat7 oracle 19c upgraded from Pega 7.2.2. Failed to start and received ClassNotFoundException com.hazelcast.config.InvalidConfigurationException. Even though there is no such class in any of the hazelcast jar in pr\_engineclasses table we were unable to find any solution for a while. we were looking for possbile hazelcast miss configuration based on java trace detail Caused by: java.lang.ClassNotFoundException: com.hazelcast.config.InvalidConfigurationException **Root cause** : This error was due to missing tomcat work (work\catalina\localhost) directory where tomcat extracts the prweb.war file during startup. **Fix:** Created tomcat work directory structure with necessary file permissions. Resolved the issue and able to start Pega 8.4.4 instance successfully REF: tomcat catalina.log =============== End Bootstrap Configuration =============== 05-Nov-2021 16:57:18.986 SEVERE [main] com.pega.pegarules.internal.bootstrap.PRBootstrap. Problem during method invocation (contextInitialized) java.lang.ExceptionInInitializerError at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineStartup.initEngine(EngineStartup.java:389) at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.\_initEngine\_privact(EngineImpl.java:180) at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.doStartup(EngineImpl.java:152) at com.pega.pegarules.web.servlet.WebAppLifeCycleListener.\_contextInitialized\_privact(WebAppLifeCycleListener.java:210) at com.pega.pegarules.web.servlet.AbstractLifeCycleListener.\_contextInitialized\_privact(AbstractLifeCycleListener.java:145) at com.pega.pegarules.web.servlet.AbstractLifeCycleListener.contextInitialized(AbstractLifeCycleListener.java:76) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:385) at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:427) at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:225) at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethod(AppServerBridgeToPega.java:274) at com.pega.pegarules.internal.web.servlet.WebAppLifeCycleListenerBoot.contextInitialized(WebAppLifeCycleListenerBoot.java:92) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4678) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5139) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:717) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:690) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:705) at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:978) at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1848) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:112) at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:773) at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:427) at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1576) at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:309) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123) at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:423) at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:366) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:936) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.startup.Catalina.start(Catalina.java:633) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:343) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:474) Caused by: java.lang.RuntimeException: Unable to create PRModulesProvider at com.pega.pegarules.common.PREngineProvider.(PREngineProvider.java:205) … 56 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.pega.pegarules.common.PREngineProvider.(PREngineProvider.java:203) … 56 more Caused by: java.lang.: com/hazelcast/config/InvalidConfigurationException at com.pega.platform.modules.internal.ModulesBridgeImpl.getModules(ModulesBridgeImpl.java:188) at com.pega.platform.modules.internal.ModulesBridgeImpl.(ModulesBridgeImpl.java:167) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at java.lang.Class.newInstance(Class.java:442) at com.pega.platform.modules.PRModulesProvider.initialize(PRModulesProvider.java:37) … 61 more Caused by: java.lang.ClassNotFoundException: com.hazelcast.config.InvalidConfigurationException at com.pega.pegarules.internal.bootstrap.phase2.PRBaseLoader.findClass(PRBaseLoader.java:324) at java.lang.ClassLoader.loadClass(ClassLoader.java:418) at com.pega.pegarules.internal.bootstrap.phase2.PRBaseLoader.loadClass(PRBaseLoader.java:249) at java.lang.ClassLoader.loadClass(ClassLoader.java:351) at com.pega.pegarules.bootstrap.loader.PRAppLoader.loadClass(PRAppLoader.java:681) at com.pega.pegarules.bootstrap.loader.PRAppLoader.loadClass(PRAppLoader.java:550) … 69 more ---
**Author:** ![patwk](https://avatars.discourse-cdn.com/v4/letter/p/c37758/32.png) [@patwk](https://forums.pega.com/u/patwk)\ **Post date:** [March 16, 2022, 8:31am UTC](https://forums.pega.com/t/pega-8-4-4-preprod-staging-uat-post-upgrade-startup-hazelcast-configuration-class-not-found-error/1914/2 "2022-03-16T08:31:33Z")
@MarissaRogers Fix is already updated. I think we should be good to resolve this.