以下是我启动tomcat时的信息,虽然不影响程序的运行(目前),但总感觉是哪没设计好,请高手指点一下是什么原因:

以下是我启动tomcat时的信息,虽然不影响程序的运行(目前),但总感觉是哪没设计好,请高手指点一下是什么原因:
2005-12-2 9:49:21 org.apache.catalina.session.StandardManager doLoad
服务器: IOException while loading persisted sessions: java.io.WriteAbortedExcept
ion: writing aborted; java.io.NotSerializableException: models.MobileBean
java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException
: 2005-12-2 9:49:22 org.apache.catalina.session.StandardManager start
服务器: Exception loading sessions from persistent storage
java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException
: models.MobileBean
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1268)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:322)
        at java.util.ArrayList.readObject(ArrayList.java:548)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:809
)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1733)        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1
636)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1264)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:322)
        at org.apache.catalina.session.StandardSession.readObject(StandardSessio
n.java:1401)
        at org.apache.catalina.session.StandardSession.readObjectData(StandardSe
ssion.java:895)
        at org.apache.catalina.session.StandardManager.doLoad(StandardManager.ja
va:450)
        at org.apache.catalina.session.StandardManager.load(StandardManager.java
:377)
        at org.apache.catalina.session.StandardManager.start(StandardManager.jav
a:690)
        at org.apache.catalina.core.ContainerBase.setManager(ContainerBase.java:
542)
        at org.apache.catalina.startup.ContextConfig.managerConfig(ContextConfig
.java:350)
        at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:65
5)
        at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfi
g.java:254)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:166)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4
212)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase
.java:866)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:85
0)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)        at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDep
loyer.java:316)
        at org.apache.catalina.core.StandardHost.install(StandardHost.java:859)
        at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.j
ava:723)
        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:473
)
        at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1002)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java
:393)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:166)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1133)        at org.apache.catalina.core.StandardHost.start(StandardHost.java:816)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1125)        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:518
)
        at org.apache.catalina.core.StandardService.start(StandardService.java:5
19)
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:234
3)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:297)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:398)
Caused by: java.io.NotSerializableException: models.MobileBean
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
        at java.util.ArrayList.writeObject(ArrayList.java:530)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:78
0)
        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:12
94)
        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.jav
a:1245)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
        at org.apache.catalina.session.StandardSession.writeObject(StandardSessi
on.java:1471)
        at org.apache.catalina.session.StandardSession.writeObjectData(StandardS
ession.java:912)
        at org.apache.catalina.session.StandardManager.doUnload(StandardManager.
java:572)
        at org.apache.catalina.session.StandardManager.unload(StandardManager.ja
va:518)
        at org.apache.catalina.session.StandardManager.stop(StandardManager.java
:720)
        at org.apache.catalina.core.StandardContext.stop(StandardContext.java:44
26)
        at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java
:995)
        at org.apache.catalina.core.StandardHostDeployer.remove(StandardHostDepl
oyer.java:599)
        at org.apache.catalina.core.StandardHost.remove(StandardHost.java:939)
        at org.apache.catalina.startup.HostConfig.undeployApps(HostConfig.java:1
047)
        at org.apache.catalina.startup.HostConfig.stop(HostConfig.java:1024)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java
:395)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:166)
        at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1165)
        at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1177)
        at org.apache.catalina.core.StandardEngine.stop(StandardEngine.java:523)        at org.apache.catalina.core.StandardService.stop(StandardService.java:57
5)
        at org.apache.catalina.core.StandardServer.stop(StandardServer.java:2377
)
        at org.apache.catalina.startup.Catalina.stop(Catalina.java:623)
        at org.apache.catalina.startup.Catalina$CatalinaShutdownHook.run(Catalin
a.java:666)