我用jb8+struts建立了一个系统，其中DM是DATAMOUDLE，有时候在启动的时候会出现下列错误，虽不影响使用，但感觉心里不塌实，请诸位大虾指教。
StandardManager[/tkGroup]: IOException while loading persisted sessions: java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: tkbf.tkGroup.myClass.DM
java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: tkbf.tkGroup.myClass.DM
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1278)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
at org.apache.catalina.session.StandardSession.readObject(StandardSession.java:1268)
at org.apache.catalina.session.StandardSession.readObjectData(StandardSession.java:810)
at org.apache.catalina.session.StandardManager.load(StandardManager.java:411)
at org.apache.catalina.session.StandardManager.start(StandardManager.java:617)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1104)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:3371)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:638)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:343)
at org.apache.catalina.core.StandardService.start(StandardService.java:388)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:506)
at org.apache.catalina.startup.Catalina.start(Catalina.java:781)
at org.apache.catalina.startup.Catalina.execute(Catalina.java:681)
at org.apache.catalina.startup.Catalina.process(Catalina.java:179)
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:324)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:243)
Caused by: java.io.NotSerializableException: tkbf.tkGroup.myClass.DM
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1330)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1302)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1245)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
at org.apache.catalina.session.StandardSession.writeObject(StandardSession.java:1338)
at org.apache.catalina.session.StandardSession.writeObjectData(StandardSession.java:827)
at org.apache.catalina.session.StandardManager.unload(StandardManager.java:507)
at org.apache.catalina.session.StandardManager.stop(StandardManager.java:654)
at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1184)
at org.apache.catalina.core.StandardContext.stop(StandardContext.java:3495)
at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:984)
at org.apache.catalina.core.StandardHost.remove(StandardHost.java:815)
at org.apache.catalina.startup.HostConfig.undeployApps(HostConfig.java:422)
at org.apache.catalina.startup.HostConfig.stop(HostConfig.java:402)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:234)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:155)
at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1151)
at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1163)
at org.apache.catalina.core.StandardService.stop(StandardService.java:435)
at org.apache.catalina.core.StandardServer.stop(StandardServer.java:535)
at org.apache.catalina.startup.Catalina.start(Catalina.java:799)
... 7 more
StandardManager[/tkGroup]: Exception loading sessions from persistent storage
java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: tkbf.tkGroup.myClass.DM
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1278)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
at org.apache.catalina.session.StandardSession.readObject(StandardSession.java:1268)
at org.apache.catalina.session.StandardSession.readObjectData(StandardSession.java:810)
at org.apache.catalina.session.StandardManager.load(StandardManager.java:411)
at org.apache.catalina.session.StandardManager.start(StandardManager.java:617)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1104)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:3371)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:638)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:343)
at org.apache.catalina.core.StandardService.start(StandardService.java:388)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:506)
at org.apache.catalina.startup.Catalina.start(Catalina.java:781)
at org.apache.catalina.startup.Catalina.execute(Catalina.java:681)
at org.apache.catalina.startup.Catalina.process(Catalina.java:179)
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:324)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:243)
Caused by: java.io.NotSerializableException: tkbf.tkGroup.myClass.DM
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1330)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1302)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1245)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
at org.apache.catalina.session.StandardSession.writeObject(StandardSession.java:1338)
at org.apache.catalina.session.StandardSession.writeObjectData(StandardSession.java:827)
at org.apache.catalina.session.StandardManager.unload(StandardManager.java:507)
at org.apache.catalina.session.StandardManager.stop(StandardManager.java:654)
at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1184)
at org.apache.catalina.core.StandardContext.stop(StandardContext.java:3495)
at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:984)
at org.apache.catalina.core.StandardHost.remove(StandardHost.java:815)
at org.apache.catalina.startup.HostConfig.undeployApps(HostConfig.java:422)
at org.apache.catalina.startup.HostConfig.stop(HostConfig.java:402)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:234)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:155)
at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1151)
at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1163)
at org.apache.catalina.core.StandardService.stop(StandardService.java:435)
at org.apache.catalina.core.StandardServer.stop(StandardServer.java:535)
at org.apache.catalina.startup.Catalina.start(Catalina.java:799)
... 7 more
ContextConfig[/tkGroup]: Added certificates -> request attribute Valve
StandardWrapper[/tkGroup:default]: Loading container servlet default
2002-5-13 13:45:49 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config='org.apache.struts.util.LocalStrings', returnNull=true
2002-5-13 13:45:49 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config='org.apache.struts.action.ActionResources', returnNull=true
2002-5-13 13:45:50 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config='tkbf.tkGroup.ApplicationResources', returnNull=true
StandardWrapper[/tkGroup:invoker]: Loading container servlet invoker
WebappLoader[]: Deploying class repositories to work directory D:\lt\Tomcat\work
WebappLoader[]: Reloading checks are enabled for this Context
StandardManager[]: Seeding random number generator class java.security.SecureRandom
StandardManager[]: Seeding of random number generator has been completed
ContextConfig[]: Added certificates -> request attribute Valve
StandardWrapper[:default]: Loading container servlet default
StandardWrapper[:invoker]: Loading container servlet invoker
HttpConnector[8080] Starting background thread
----signIn reset
2002-5-13 13:45:56 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config='org.apache.struts.taglib.html.LocalStrings', returnNull=true
2002-5-13 13:45:56 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config='org.apache.struts.util.LocalStrings', returnNull=true
2002-5-13 13:45:56 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config='org.apache.struts.taglib.html.LocalStrings', returnNull=true
2002-5-13 13:45:56 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config='org.apache.struts.taglib.html.LocalStrings', returnNull=true
2002-5-13 13:45:56 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config='org.apache.struts.taglib.html.LocalStrings', returnNull=true
2002-5-13 13:45:56 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config='org.apache.struts.taglib.html.LocalStrings', returnNull=true
2002-5-13 13:45:56 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config='org.apache.struts.taglib.html.LocalStrings', returnNull=true
2002-5-13 13:45:56 org.apache.struts.util.PropertyMessageResources <init>
信息: Initializing, config='org.apache.struts.taglib.html.LocalStrings', returnNull=true
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