When I start tomcat6 and struts2,sometimes when I start tomcat,it will raise following error,but sometimes when I start tomcat6,it don't raise any error! I am puzzled with it for a very long time!!! Anyone could tell the reason and how to solve it? Error information is following: Exception loading sessions from persistent storage java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: org.apache.catalina.connector.RequestFacade at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1333) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1945) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1869) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java :1753) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at java.util.ArrayList.readObject(ArrayList.java:593) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke( NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1846) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java :1753) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1945) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1869) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java :1753) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at org.apache.catalina.session.StandardSession.readObject( StandardSession.java:1440) at org.apache.catalina.session.StandardSession.readObjectData( StandardSession.java:943) at org.apache.catalina.session.StandardManager.doLoad(StandardManager.java :394) at org.apache.catalina.session.StandardManager.load(StandardManager.java :321) at org.apache.catalina.session.StandardManager.start(StandardManager.java :637) at org.apache.catalina.core.ContainerBase.setManager(ContainerBase.java :432) at org.apache.catalina.core.StandardContext.start(StandardContext.java :4257) at org.apache.catalina.core.ContainerBase.addChildInternal( ContainerBase.java:760) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525) at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java :920) at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java :883) at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492) at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138) at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java :311) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent( LifecycleSupport.java:120) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022) at org.apache.catalina.core.StandardHost.start(StandardHost.java:719) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443) at org.apache.catalina.core.StandardService.start(StandardService.java:451) at org.apache.catalina.core.StandardServer.start(StandardServer.java:710) at org.apache.catalina.startup.Catalina.start(Catalina.java:552) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke( NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413) Caused by: java.io.NotSerializableException: org.apache.catalina.connector.RequestFacade at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1156) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java :1509) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1474) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java :1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) at java.util.ArrayList.writeObject(ArrayList.java:570) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke( NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1461) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java :1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java :1509) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1474) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java :1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) at org.apache.catalina.session.StandardSession.writeObject( StandardSession.java:1516) at org.apache.catalina.session.StandardSession.writeObjectData( StandardSession.java:960) at org.apache.catalina.session.StandardManager.doUnload( StandardManager.java:517) at org.apache.catalina.session.StandardManager.unload(StandardManager.java :463) at org.apache.catalina.session.StandardManager.stop(StandardManager.java :667) at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4498) at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java :893) at org.apache.catalina.startup.HostConfig.undeployApps(HostConfig.java :1180) at org.apache.catalina.startup.HostConfig.stop(HostConfig.java:1151) at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java :313) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent( LifecycleSupport.java:120) at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1055) at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1067) at org.apache.catalina.core.StandardEngine.stop(StandardEngine.java:448) at org.apache.catalina.core.StandardService.stop(StandardService.java:513) at org.apache.catalina.core.StandardServer.stop(StandardServer.java:744) at org.apache.catalina.startup.Catalina.stop(Catalina.java:602) at org.apache.catalina.startup.Catalina.start(Catalina.java:577) ... 6 more 2006-12-24 19:30:11 org.apache.coyote.http11.Http11Protocol start Info: Starting Coyote HTTP/1.1 on http-8080
