Seeing problems in region-based marshalling/unmarshalling with FileCacheLoader[1]. Looking at the code, it looks like when doing a write with region-based marshalling enabled, the cache loader isn't writing the region Fqn as the leading part of the stream. That might be by design, as its OK if we're *sure* the correct CL will always be assigned to the thread before *any* attempt is made to read from the persistent store. It's breaking down though in the FileCacheLoader.doUnmarshall call, which is calling into the marshaller and letting it decide whether region-based marshalling is in effect. The marshaller thinks it is, and tries to unmarshall a leading region Fqn. This fails. Here's a stack trace showing a failed read from the persistent store. Read is occuring in preparation for a write, but it's the read that is failing: 2008-04-20 01:06:27,996 ERROR [org.jboss.web.tomcat.service.session.JBossCacheManager] (ContainerBackgroundProcessor[StandardEngine[jboss.web]]) processExpires(): failed removing unloaded session 0Fm8CDBXTJp40M0Wfvjw6Q__ java.lang.ClassCastException: java.util.HashMap at org.jboss.cache.marshall.CacheMarshaller200.objectFromObjectStreamRegionBased(CacheMarshaller200.java:175) at org.jboss.cache.marshall.CacheMarshaller200.objectFromObjectStream(CacheMarshaller200.java:115) at org.jboss.cache.marshall.VersionAwareMarshaller.objectFromObjectStream(VersionAwareMarshaller.java:324) at org.jboss.cache.loader.FileCacheLoader.doUnmarshall(FileCacheLoader.java:473) at org.jboss.cache.loader.AbstractCacheLoader.regionAwareUnmarshall(AbstractCacheLoader.java:221) at org.jboss.cache.loader.FileCacheLoader.loadAttributes(FileCacheLoader.java:426) at org.jboss.cache.loader.FileCacheLoader.put(FileCacheLoader.java:247) at org.jboss.cache.loader.FileCacheLoader.put(FileCacheLoader.java:238) at org.jboss.cache.interceptors.PassivationInterceptor.handleEvictMethod(PassivationInterceptor.java:53) at org.jboss.cache.interceptors.MethodDispacherInterceptor.invoke(MethodDispacherInterceptor.java:126) at org.jboss.cache.interceptors.Interceptor.nextInterceptor(Interceptor.java:111) at org.jboss.cache.interceptors.MethodDispacherInterceptor.invoke(MethodDispacherInterceptor.java:58) at org.jboss.cache.interceptors.Interceptor.nextInterceptor(Interceptor.java:111) at org.jboss.cache.interceptors.PessimisticLockInterceptor.handleEvictMethod(PessimisticLockInterceptor.java:341) at org.jboss.cache.interceptors.MethodDispacherInterceptor.invoke(MethodDispacherInterceptor.java:126) at org.jboss.cache.interceptors.PessimisticLockInterceptor.invoke(PessimisticLockInterceptor.java:81) at org.jboss.cache.interceptors.Interceptor.nextInterceptor(Interceptor.java:111) at org.jboss.cache.interceptors.MethodDispacherInterceptor.invoke(MethodDispacherInterceptor.java:58) at org.jboss.cache.interceptors.Interceptor.nextInterceptor(Interceptor.java:111) at org.jboss.cache.interceptors.MethodDispacherInterceptor.invoke(MethodDispacherInterceptor.java:58) at org.jboss.cache.interceptors.Interceptor.nextInterceptor(Interceptor.java:111) at org.jboss.cache.interceptors.TxInterceptor.handleNonTxMethod(TxInterceptor.java:456) at org.jboss.cache.interceptors.TxInterceptor.handleEvictMethod(TxInterceptor.java:200) at org.jboss.cache.interceptors.MethodDispacherInterceptor.invoke(MethodDispacherInterceptor.java:126) at org.jboss.cache.interceptors.Interceptor.nextInterceptor(Interceptor.java:111) at org.jboss.cache.interceptors.CacheMgmtInterceptor.handleEvictMethod(CacheMgmtInterceptor.java:64) at org.jboss.cache.interceptors.MethodDispacherInterceptor.invoke(MethodDispacherInterceptor.java:126) at org.jboss.cache.interceptors.Interceptor.nextInterceptor(Interceptor.java:111) at org.jboss.cache.interceptors.InvocationContextInterceptor.invoke(InvocationContextInterceptor.java:73) at org.jboss.cache.invocation.AbstractInvocationDelegate.invoke(AbstractInvocationDelegate.java:123) at org.jboss.cache.invocation.AbstractInvocationDelegate.invoke(AbstractInvocationDelegate.java:64) at org.jboss.cache.invocation.CacheInvocationDelegate.evict(CacheInvocationDelegate.java:380) at org.jboss.cache.invocation.CacheInvocationDelegate.evictChildren(CacheInvocationDelegate.java:355) at org.jboss.cache.invocation.CacheInvocationDelegate.evict(CacheInvocationDelegate.java:340) at org.jboss.web.tomcat.service.session.JBossCacheWrapper.evictSubtree(JBossCacheWrapper.java:273) at org.jboss.web.tomcat.service.session.JBossCacheService.evictSession(JBossCacheService.java:388) at org.jboss.web.tomcat.service.session.JBossCacheManager.processUnloadedSessionPassivation(JBossCacheManager.java:1795) at org.jboss.web.tomcat.service.session.JBossCacheManager.processExpires(JBossCacheManager.java:1554) at org.jboss.web.tomcat.service.session.JBossManager.backgroundProcess(JBossManager.java:895) at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1316) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590) at java.lang.Thread.run(Thread.java:595)