fedora core 4 issues

need help:

have installed on an up to date Fedora Core 4 with fedora's gcj, and tomcat5.
when starting tomcat, i see the below in catalina.out:

Is there a good work around for this?  My first instinct is to get rid of
 gcj, but I don't see a simple means of accomplishing that.

any help would be appreciated,

Ben

---- Begin error message ----


INFO: Installing web application at context path /jamm from URL
file:/var/lib/tomcat5/webap
ps/jamm
Nov 29 07:22:07 ERROR [main] session.ManagerBase - IOException while loading
persisted sessions: java.io.IOException: Unknown marker on stream: 4
java.io.IOException: Unknown marker on stream: 4
   at java.io.ObjectInputStream.readObject() (/usr/lib/libgcj.so.6.0.0)
   at
org.apache.catalina.session.StandardSession.readObject(java.io.ObjectInputStr
eam) (/u
sr/lib/libcatalina-5.0.30.jar.so)
   at
org.apache.catalina.session.StandardSession.readObjectData(java.io.ObjectInpu
tStream) (/usr/lib/libcatalina-5.0.30.jar.so)
   at org.apache.catalina.session.StandardManager.doLoad()
(/usr/lib/libcatalina-5.0.30.jar
.so)
   at org.apache.catalina.session.StandardManager.load()
(/usr/lib/libcatalina-5.0.30.jar.s
o)
   at org.apache.catalina.session.StandardManager.start()
(/usr/lib/libcatalina-5.0.30.jar.
so)
   at
org.apache.catalina.core.ContainerBase.setManager(org.apache.catalina.Manager
) (/usr/
lib/libcatalina-5.0.30.jar.so)
   at org.apache.catalina.startup.ContextConfig.managerConfig()
(/usr/lib/libcatalina-5.0.3
0.jar.so)
   at org.apache.catalina.startup.ContextConfig.start()
(/usr/lib/libcatalina-5.0.30.jar.so
)
   at
org.apache.catalina.startup.ContextConfig.lifecycleEvent(org.apache.catalina.
Lifecycl eEvent) (/usr/lib/libcatalina-5.0.30.jar.so)
   at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(java.lang.String
, java.l
ang.Object) (/usr/lib/libcatalina-5.0.30.jar.so)
   at org.apache.catalina.core.StandardContext.start()
(/usr/lib/libcatalina-5.0.30.jar.so)
   at
org.apache.catalina.core.ContainerBase.addChildInternal(org.apache.catalina.C
ontainer ) (/usr/lib/libcatalina-5.0.30.jar.so)
   at
org.apache.catalina.core.ContainerBase.addChild(org.apache.catalina.Container
) (/usr/
lib/libcatalina-5.0.30.jar.so)
   at
org.apache.catalina.core.StandardHost.addChild(org.apache.catalina.Container)
(/usr/l
ib/libcatalina-5.0.30.jar.so)
   at org.apache.catalina.core.StandardHostDeployer.install(java.lang.String,
java.net.URL)
 (/usr/lib/libcatalina-5.0.30.jar.so)
   at org.apache.catalina.core.StandardHost.install(java.lang.String,
java.net.URL) (/usr/l
ib/libcatalina-5.0.30.jar.so)
   at org.apache.catalina.startup.HostConfig.deployDirectories(java.io.File,
java.lang.Stri
ng[]) (/usr/lib/libcatalina-5.0.30.jar.so)
   at org.apache.catalina.startup.HostConfig.deployApps()
(/usr/lib/libcatalina-5.0.30.jar.
so)
   at org.apache.catalina.startup.HostConfig.start()
(/usr/lib/libcatalina-5.0.30.jar.so)
   at
org.apache.catalina.startup.HostConfig.lifecycleEvent(org.apache.catalina.Lif
ecycleEv ent) (/usr/lib/libcatalina-5.0.30.jar.so)
   at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(java.lang.String
, java.l
ang.Object) (/usr/lib/libcatalina-5.0.30.jar.so)
   at org.apache.catalina.core.ContainerBase.start()
(/usr/lib/libcatalina-5.0.30.jar.so)
   at org.apache.catalina.core.StandardHost.start()
(/usr/lib/libcatalina-5.0.30.jar.so)
   at org.apache.catalina.core.ContainerBase.start()
(/usr/lib/libcatalina-5.0.30.jar.so)
   at org.apache.catalina.core.StandardEngine.start()
(/usr/lib/libcatalina-5.0.30.jar.so)
   at org.apache.catalina.core.StandardService.start()
(/usr/lib/libcatalina-5.0.30.jar.so)
   at org.apache.catalina.core.StandardServer.start()
(/usr/lib/libcatalina-5.0.30.jar.so)
   at org.apache.catalina.startup.Catalina.start()
(/usr/lib/libcatalina-5.0.30.jar.so)
   at java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[])
(/usr/lib/libgc
j.so.6.0.0)
   at org.apache.catalina.startup.Bootstrap.start()
(/usr/lib/libtomcat-bootstrap-5.0.30.ja
r.so)
   at org.apache.catalina.startup.Bootstrap.main(java.lang.String[])
(/usr/lib/libtomcat-bootstrap-5.0.30.jar.so)
   at gnu.java.lang.MainThread.call_main() (/usr/lib/libgcj.so.6.0.0)
   at gnu.java.lang.MainThread.run() (/usr/lib/libgcj.so.6.0.0)

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