#46 storage - serialization errors
In Cewolf 0.9.8 on Tomcat 4.1, my log is full of
serialization errors, especially at startup and shutdown
(see end of message). Other users have reported similar
problems.
I wondered if it was related to the storage param in
web.xml. I've been using TransientSessionStorage (see
below) because I saw it in an example somewhere, but I
don't know if I need to specify a storage option, and if
so, which one I should specify.
I'm not in a clustered environment. I just want to make
sure that the correct chart is returned to each user.
Any suggestions?
---------------------------------------
<servlet>
<servlet-name>CewolfServlet</servlet-name>
<servlet-class>
de.laures.cewolf.CewolfRenderer
</servlet-class>
<!-- sets storage implementation -->
<init-param>
<param-name>storage</param-name>
<param-
value>de.laures.cewolf.storage.TransientSessionStorage
</param-value>
</init-param>
---------------------------------------
2004-06-04 15:43:15 StandardManager[/casper] Cannot
serialize session attribute -1888398799 for session
7442FC28BFF9D5F21C3C88C181A1B122
java.io.NotSerializableException:
de.laures.cewolf.util.RenderedImage
at java.io.ObjectOutputStream.writeObject0
(ObjectOutputStream.java:1054)
at java.io.ObjectOutputStream.defaultWriteFields
(ObjectOutputStream.java:1332)
at java.io.ObjectOutputStream.writeSerialData
(ObjectOutputStream.java:1304)
at java.io.ObjectOutputStream.writeOrdinaryObject
(ObjectOutputStream.java:1247)
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:1441)
at
org.apache.catalina.session.StandardSession.writeObject
Data(StandardSession.java:880)
at org.apache.catalina.session.StandardManager.unload
(StandardManager.java:536)
at org.apache.catalina.session.StandardManager.stop
(StandardManager.java:691)
at org.apache.catalina.core.StandardContext.stop
(StandardContext.java:3688)
at org.apache.catalina.core.ContainerBase.removeChild
(ContainerBase.java:1036)
at
org.apache.catalina.core.StandardHostDeployer.remove
(StandardHostDeployer.java:470)
at org.apache.catalina.core.StandardHost.remove
(StandardHost.java:868)
at org.apache.catalina.startup.HostConfig.undeployApps
(HostConfig.java:758)
at org.apache.catalina.startup.HostConfig.stop
(HostConfig.java:738)
at org.apache.catalina.startup.HostConfig.lifecycleEvent
(HostConfig.java:360)
at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEve
nt(LifecycleSupport.java:166)
at org.apache.catalina.core.ContainerBase.stop
(ContainerBase.java:1221)
...