Hi, I'm working with Tomcat 10.1.
When a user starts using the store in my web application, I save the ShopCart object on the "cart" session attribute. I want the "cart" attributes to return to the session after restarting the app. To enable session persistence I added <Manager pathname="SESSIONS.ser" /> to the Context. It loads the StandardManager. And this works fine - after reload / restart the object "ShopCart" is back in the session. I want to experiment with PersistentManager. Tomcat docs says: " The persistence across restarts provided by the *StandardManager* is a simpler implementation than that provided by the *PersistentManager*. If robust, production quality persistence across restarts is required then the *PersistentManager* should be used with an appropriate configuration. " I hope for a Listener of deserialization of the session attributes. The new Manager configuration looks like this: <Manager className="org.apache.catalina.session.PersistentManager" maxActiveSessions="2" saveOnRestart="true"> <Store className="org.apache.catalina.session.FileStore" directory= "c:\tomcat10\sessionperm"/> </Manager> But it doesn't work. After restart I get this exception: java.lang.ClassNotFoundException: ....ShopCart at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1332) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1144) at java.base/java.lang.Class.forName0(Native Method) at java.base/java.lang.Class.forName(Class.java:534) at java.base/java.lang.Class.forName(Class.java:513) at org.apache.catalina.util.CustomObjectInputStream.resolveClass(CustomObjectInputStream.java:158) at java.base/java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:2061) at java.base/java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1927) at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2252) at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1762) at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:540) at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:498) at org.apache.catalina.session.StandardSession.doReadObject(StandardSession.java:1198) at org.apache.catalina.session.StandardSession.readObjectData(StandardSession.java:831) at org.apache.catalina.session.FileStore.load(FileStore.java:203) at org.apache.catalina.session.StoreBase.processExpires(StoreBase.java:138) at org.apache.catalina.session.PersistentManagerBase.processExpires(PersistentManagerBase.java:409) at org.apache.catalina.session.ManagerBase.backgroundProcess(ManagerBase.java:587) at org.apache.catalina.core.StandardContext.backgroundProcess(StandardContext.java:4787) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1172) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1176) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1176) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1154) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572) at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:358) at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63) at java.base/java.lang.Thread.run(Thread.java:1583) I guess this means that the two managers use ClassLoader differently. How to get the PersistentManager to work in this case? Best regards, -- Jakub Królikowski
