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    Exception in thread "main" java.util.Hashtable$Enumerator at Source) at Source) at

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    via Stack Overflow by Matthias

    Your object contains member variables which are themselves not serializable 'ReportDataStoreRegion'. If you really want to serialize your object. One option would be to declare the variable as transient so that it is not serialized.

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writing aborted; org.apache.struts.upload.CommonsMultipartRequestHandler$CommonsFormFile	at	at	at	at	at	at	at java.util.HashMap.writeObject(	at sun.reflect.GeneratedMethodAccessor520.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(	at java.lang.reflect.Method.invoke(	at	at	at	at	at	at	at	at	at	at	at	at	at	at	at	at org.apache.catalina.session.StandardSession.writeObject(	at org.apache.catalina.session.StandardSession.writeObjectData(	at org.apache.catalina.session.StandardManager.doUnload(	at org.apache.catalina.session.StandardManager.unload(	at org.apache.catalina.session.StandardManager.stop(	at org.apache.catalina.core.StandardContext.stop(	at org.apache.catalina.startup.HostConfig.checkResources(	at org.apache.catalina.startup.HostConfig.check(	at org.apache.catalina.startup.HostConfig.lifecycleEvent(	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(	at org.apache.catalina.core.ContainerBase.backgroundProcess(	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(	at org.apache.catalina.core.ContainerBase$	at