[jbosscache-dev] Bug in 2.1.1.CR4 CacheLoader region-based unmarshalling

[Brian Stansberry]

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)

-- 
Brian Stansberry
Lead, AS Clustering
JBoss, a division of Red Hat
brian.stansberry at redhat.com