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From "Gary Jarrel" <garyjar...@gmail.com>
Subject Strange Exception
Date Sat, 12 Jan 2008 00:42:10 GMT
Hi All!

'm havign a strange problem under Cayenne 3.0M2 which is very intermitent.
Using a web application backed by Cayenne, the user modifies property
records in the database via a web interface. Everything runs fine until one
of the modifications cause the following exception:

[2008-01-12 11:32:13,174] ERROR org.mortbay.log (JCLLoggerAdapter.java:543)
- Nested in javax.servlet.ServletException: [v.3.0M2 Oct 28 2007 16:09:02]
Commit Exception:
org.apache.cayenne.CayenneRuntimeException: [v.3.0M2 Oct 28 2007 16:09:02]
Commit Exception
        at org.apache.cayenne.access.DataContext.flushToParent(
DataContext.java:1202)
        at org.apache.cayenne.access.DataContext.commitChanges(
DataContext.java:1083)
        at au.com.jarrel.commons.db.cayenne.dao.impl.BaseDaoImpl.commit(
BaseDaoImpl.java:91)
        at
au.com.hybridkinetic.jarrel.web.action.admin.listing.AddListing.runAction(
AddListing.java:72)
        at au.com.hybridkinetic.jarrel.web.action.BaseAction.execute(
BaseAction.java:80)
        at org.apache.struts.action.RequestProcessor.processActionPerform(
RequestProcessor.java:431)
        at org.apache.struts.action.RequestProcessor.process(
RequestProcessor.java:236)
        at org.apache.struts.action.ActionServlet.process(ActionServlet.java
:1196)
        at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java
:432)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java
:487)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(
ServletHandler.java:1087)
        at net.sf.ehcache.constructs.web.filter.GzipFilter.doFilter(
GzipFilter.java:75)
        at net.sf.ehcache.constructs.web.filter.Filter.doFilter(Filter.java
:92)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(
ServletHandler.java:1078)
        at
org.riotfamily.common.web.filter.CharacterEncodingFilter.doFilterInternal(
CharacterEncodingFilter.java:95)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(
OncePerRequestFilter.java:75)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(
ServletHandler.java:1078)
        at
au.com.jarrel.commons.db.cayenne.i18n.web.filter.LocaleEnforecementFilter.doFilter
(LocaleEnforecementFilter.java:59)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(
ServletHandler.java:1078)
        at
au.com.jarrel.commons.db.cayenne.i18n.web.filter.JstlLocaleFilter.doFilter(
JstlLocaleFilter.java:125)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(
ServletHandler.java:1078)
        at
au.com.jarrel.commons.db.cayenne.i18n.web.filter.LocaleSettingFilter.doFilter
(LocaleSettingFilter.java:110)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(
ServletHandler.java:1078)
        at au.com.hybridkinetic.jarrel.web.RequestUrlFilter.doFilter(
RequestUrlFilter.java:52)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(
ServletHandler.java:1078)
        at
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(
FilterChainProxy.java:265)
        at org.acegisecurity.intercept.web.FilterSecurityInterceptor.invoke(
FilterSecurityInterceptor.java:107)
        at
org.acegisecurity.intercept.web.FilterSecurityInterceptor.doFilter(
FilterSecurityInterceptor.java:72)
        at
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(
FilterChainProxy.java:275)
        at org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(
ExceptionTranslationFilter.java:110)
        at
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(
FilterChainProxy.java:275)
        at
org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(
AnonymousProcessingFilter.java:125)
        at
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(
FilterChainProxy.java:275)
        at
org.acegisecurity.wrapper.SecurityContextHolderAwareRequestFilter.doFilter(
SecurityContextHolderAwareRequestFilter.java:81)
        at
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(
FilterChainProxy.java:275)
        at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(
AbstractProcessingFilter.java:229)
        at
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(
FilterChainProxy.java:275)
        at org.acegisecurity.ui.logout.LogoutFilter.doFilter(
LogoutFilter.java:106)
        at
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(
FilterChainProxy.java:275)
        at
org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(
HttpSessionContextIntegrationFilter.java:286)
        at
org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(
FilterChainProxy.java:275)
        at org.acegisecurity.util.FilterChainProxy.doFilter(
FilterChainProxy.java:149)
        at org.acegisecurity.util.FilterToBeanProxy.doFilter(
FilterToBeanProxy.java:98)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(
ServletHandler.java:1078)
        at org.apache.cayenne.conf.WebApplicationContextFilter.doFilter(
WebApplicationContextFilter.java:91)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(
ServletHandler.java:1078)
        at org.mortbay.jetty.servlet.ServletHandler.handle(
ServletHandler.java:361)
        at org.mortbay.jetty.security.SecurityHandler.handle(
SecurityHandler.java:216)
        at org.mortbay.jetty.servlet.SessionHandler.handle(
SessionHandler.java:181)
        at org.mortbay.jetty.handler.ContextHandler.handle(
ContextHandler.java:712)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java
:406)
        at org.mortbay.jetty.handler.ContextHandlerCollection.handle(
ContextHandlerCollection.java:211)
        at org.mortbay.jetty.handler.HandlerCollection.handle(
HandlerCollection.java:114)
        at org.mortbay.jetty.handler.HandlerWrapper.handle(
HandlerWrapper.java:139)
        at org.mortbay.jetty.Server.handle(Server.java:309)
        at org.mortbay.jetty.HttpConnection.handleRequest(
HttpConnection.java:506)
        at org.mortbay.jetty.HttpConnection$RequestHandler.content(
HttpConnection.java:844)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
        at org.mortbay.io.nio.SelectChannelEndPoint.run(
SelectChannelEndPoint.java:396)
        at org.mortbay.thread.BoundedThreadPool$PoolThread.run(
BoundedThreadPool.java:442)
Caused by: java.lang.NullPointerException
        at org.apache.cayenne.access.DataContext$1.visitToOne(
DataContext.java:599)
        at org.apache.cayenne.reflect.generic.DataObjectToOneProperty.visit(
DataObjectToOneProperty.java:85)
        at
org.apache.cayenne.reflect.PersistentDescriptor.visitDeclaredProperties(
PersistentDescriptor.java:323)
        at org.apache.cayenne.reflect.PersistentDescriptor.visitProperties(
PersistentDescriptor.java:358)
        at
org.apache.cayenne.reflect.LazyClassDescriptorDecorator.visitProperties(
LazyClassDescriptorDecorator.java:138)
        at org.apache.cayenne.access.DataContext.currentSnapshot(
DataContext.java:543)
        at org.apache.cayenne.access.DataDomainSyncBucket.postprocess(
DataDomainSyncBucket.java:230)
        at org.apache.cayenne.access.DataDomainFlushAction.postprocess(
DataDomainFlushAction.java:240)
        at org.apache.cayenne.access.DataDomainFlushAction.flush(
DataDomainFlushAction.java:148)
        at org.apache.cayenne.access.DataDomain.onSyncFlush(DataDomain.java
:827)
        at org.apache.cayenne.access.DataDomain$2.transform(DataDomain.java
:794)
        at org.apache.cayenne.access.DataDomain.runInTransaction(
DataDomain.java:853)
        at org.apache.cayenne.access.DataDomain.onSync(DataDomain.java:791)
        at org.apache.cayenne.access.DataContext.flushToParent(
DataContext.java:1170)
        ... 63 more

I can not seem to establish a pattern to why this happens, it will usually
happen within the first 10 - 15 commits  the application does, after the
server starts.

I've started checking the objects in the context. When the commit works fine
there are no modified and/or uncommitted objects in the graph. But as soon
as this happens there graph contains the object/record which I was working
with in both modified and committed state. This object is then stuck in the
context so any further work with the application would cause the same
failure.

The main question is if anyone has any clue to what could cause this
exception?

The second is how do people handle objects handing around in the graph if an
exception is thrown during comit? Perhaps one solution is to catch the
Exception in the web filter, rollback any changes on the context and remove
all the dirty objects in the graph? But this does not sound very clean to
me?

Thank you in advance!

Cheers,
Gary

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