On Fri, May 24, 2024 at 11:23 AM Mark Thomas <ma...@apache.org> wrote:
> Can you provide the simplest web application (with source) that > replications the problem? > > Mark > > > On 23/05/2024 23:45, Jakub Królikowski wrote: > > 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 > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > > Hi Mark, It seems to me that this can be tested on any application. In Tomcat 10.1, if any session attribute is an instance of a new public class (unknown to Tomcat and to Tomcat class loader), implementing java.io.Serializable, then on reloading the application PersistanceManager (configured as in the first message) crashes with ClassNotFoundException. StandardManager works. I don't know if this problem occurred in earlier versions of Tomcat. If you fail to reproduce this bug, let me know, I will prepare a simple web app. Best regards, Jakub
