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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 31326] New: - Event-aware cache: registry persistence at shutdown fails (StoreEventRegistryImpl)
Date Tue, 21 Sep 2004 05:26:06 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=31326

Event-aware cache: registry persistence at shutdown fails (StoreEventRegistryImpl)

           Summary: Event-aware cache: registry persistence at shutdown
                    fails (StoreEventRegistryImpl)
           Product: Cocoon 2
           Version: 2.1.5
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: Major
          Priority: Other
         Component: blocks
        AssignedTo: dev@cocoon.apache.org
        ReportedBy: oliver.powell@tvnz.co.nz
                CC: cmoss@tvnz.co.nz


Related to bug #23585

Event registry persistence (using StoreEventRegistryImpl) to the default JCS 
cache when tomcat shuts down fails. I get the following stack trace in the 
logs:

WARN    (2004-09-21) 12:28.53:455   [core.manager] (Unknown-URI) Unknown-
thread/ExcaliburComponentManager: disposing of handler for unreleased 
component. role [org.apache.cocoon.caching.EventRegistry]
DEBUG   (2004-09-21) 12:28.53:455   [core.manager] (Unknown-URI) Unknown-
thread/DefaultComponentFactory: ComponentFactory decommissioning instance of 
org.apache.cocoon.caching.impl.StoreEventRegistryImpl.
DEBUG   (2004-09-21) 12:28.53:458   [core.store] (Unknown-URI) Unknown-
thread/JCSDefaultStore: Store object 
org.apache.cocoon.caching.impl.EventRegistryDataWrapper@1d4640 with key 
EVENTREGWRAPPER
WARN    (2004-09-21) 12:28.53:459   [core.manager] (Unknown-URI) Unknown-
thread/ThreadSafeComponentHandler: Error decommissioning component: 
org.apache.cocoon.caching.impl.StoreEventRegistryImpl
java.lang.NullPointerException
        at org.apache.cocoon.components.store.impl.JCSDefaultStore.store
(JCSDefaultStore.java:276)
        at org.apache.cocoon.caching.impl.StoreEventRegistryImpl.persist
(StoreEventRegistryImpl.java:44)
        at 
org.apache.cocoon.caching.impl.AbstractDoubleMapEventRegistry.dispose
(AbstractDoubleMapEventRegistry.java:154)
        at org.apache.avalon.framework.container.ContainerUtil.dispose
(ContainerUtil.java:345)
        at 
org.apache.avalon.excalibur.component.DefaultComponentFactory.decommission
(DefaultComponentFactory.java:336)
        at 
org.apache.avalon.excalibur.component.ThreadSafeComponentHandler.dispose
(ThreadSafeComponentHandler.java:165)
        at 
org.apache.avalon.excalibur.component.ExcaliburComponentManager.dispose
(ExcaliburComponentManager.java:621)
        at org.apache.cocoon.components.CocoonComponentManager.dispose
(CocoonComponentManager.java:468)
        at org.apache.avalon.framework.container.ContainerUtil.dispose
(ContainerUtil.java:345)
        at org.apache.cocoon.Cocoon.dispose(Cocoon.java:499)
        at org.apache.avalon.framework.container.ContainerUtil.dispose
(ContainerUtil.java:345)
        at org.apache.cocoon.servlet.CocoonServlet.disposeCocoon
(CocoonServlet.java:1488)
        at org.apache.cocoon.servlet.CocoonServlet.destroy
(CocoonServlet.java:498)
        at org.apache.catalina.core.StandardWrapper.unload
(StandardWrapper.java:1270)
        at org.apache.catalina.core.StandardWrapper.stop
(StandardWrapper.java:1595)
        at org.apache.catalina.core.ContainerBase.removeChild
(ContainerBase.java:995)
        at org.apache.catalina.core.StandardContext.removeChild
(StandardContext.java:3094)
        at org.apache.catalina.startup.ContextConfig.stop
(ContextConfig.java:693)
        at org.apache.catalina.startup.ContextConfig.lifecycleEvent
(ContextConfig.java:255)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent
(LifecycleSupport.java:166)
        at org.apache.catalina.core.StandardContext.stop
(StandardContext.java:4443)
        at org.apache.catalina.core.ContainerBase.removeChild
(ContainerBase.java:995)
        at org.apache.catalina.core.StandardHostDeployer.remove
(StandardHostDeployer.java:606)
        at org.apache.catalina.core.StandardHost.remove(StandardHost.java:955)
        at org.apache.catalina.startup.HostConfig.undeployApps
(HostConfig.java:1053)
        at org.apache.catalina.startup.HostConfig.stop(HostConfig.java:1030)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent
(HostConfig.java:396)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent
(LifecycleSupport.java:166)
        at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1166)
        at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1178)
        at org.apache.catalina.core.StandardEngine.stop
(StandardEngine.java:526)
        at org.apache.catalina.core.StandardService.stop
(StandardService.java:581)
        at org.apache.catalina.core.StandardServer.stop
(StandardServer.java:2379)
        at org.apache.catalina.startup.Catalina.stop(Catalina.java:643)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:618)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:297)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:398)

I added some debug and confirmed that it is the JCSCacheAccess member 
variable 'this.jcs' that is null in JCSDefaultStore.

The reason it is null looks to be because the JCS Store is actually disposed 
of during the shutdown process BEFORE StoreEventRegistryImpl.dispose() is 
invoked. Here is an excerpt from the logs:

WARN    (2004-09-21) 12:28.51:997   [core.manager] (Unknown-URI) Unknown-
thread/ExcaliburComponentManager: disposing of handler for unreleased 
component. role [org.apache.excalibur.store.Store]
DEBUG   (2004-09-21) 12:28.51:997   [core.manager] (Unknown-URI) Unknown-
thread/DefaultComponentFactory: ComponentFactory decommissioning instance of 
org.apache.cocoon.components.store.impl.JCSDefaultStore.

Note the timestamps - they are 2 seconds before the Event registry disposal 
logs.

My config (cocoon.xconf):
  ...
  <store logger="core.store">
    <parameter name="maxobjects" value="1"/>
    <parameter name="use-cache-directory" value="true"/>
  </store>
  ...
  <component class="org.apache.cocoon.caching.impl.EventAwareCacheImpl" 
               role="org.apache.cocoon.caching.Cache/EventAware"/>
  <component role="org.apache.cocoon.caching.EventRegistry"
               class="org.apache.cocoon.caching.impl.StoreEventRegistryImpl"/>
  ...

It seems to me the solution is to somehow indicate to the container that the 
EventRegistry is dependent on the Cache store, so they get disposed of 
correctly. But I'm not yet sure how this would be done in the Avalon/Excalibur 
framework. (I guess I could always hard-code the JCS dispose method to 
dispose/cache the Event registry first! uggh)

Has anyone else run into this? Any suggestions?

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