with QueuedPessimisticEJBLock, read-only shorten the duration of the lock, it does
not remove it. it locks the bean for the duration of the call
instead of the duration of the transaction.
julien
CM> As I understand it, methods marked as read-only on an entity bean shouldn't try
and lock the bean when they are called. So, if I have two instances of an entity bean
(same bean class, different
CM> PK), they can call read-only methods on each other at the same time.
CM> So, can anyone explain why I'm seeing ApplicationDeadlockExceptions on read-only
methods in my application? Example stack trace:
CM> org.jboss.ejb.plugins.lock.ApplicationDeadlockException: Application deadlock
detected: Two or more transactions contention.
CM> at
org.jboss.ejb.plugins.lock.BeanLockSupport.deadlockDetection(BeanLockSupport.java:138)
CM> at
org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock.waitForTx(QueuedPessimisticEJBLock.java:270)
CM> at
org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock.doSchedule(QueuedPessimisticEJBLock.java:209)
CM> at
org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock.schedule(QueuedPessimisticEJBLock.java:157)
CM> at
org.jboss.ejb.plugins.EntityLockInterceptor.invoke(EntityLockInterceptor.java:85)
CM> at
org.jboss.ejb.plugins.EntityCreationInterceptor.invoke(EntityCreationInterceptor.java:53)
CM> at
org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:84)
CM> at
org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:243)
CM> at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:104)
CM> at
org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:117)
CM> at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:191)
CM> at
org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
CM> at org.jboss.ejb.EntityContainer.internalInvoke(EntityContainer.java:483)
CM> at org.jboss.ejb.Container.invoke(Container.java:674)
CM> at
org.jboss.ejb.plugins.local.BaseLocalProxyFactory.invoke(BaseLocalProxyFactory.java:353)
CM> at org.jboss.ejb.plugins.local.EntityProxy.invoke(EntityProxy.java:38)
CM> at $Proxy80.getUrlPathNoSlash(Unknown Source)
CM> at
uk.ac.warwick.cms.model.PageLocation.getChildLocations(PageLocation.java:743)
CM> getUrlPathNoSlash() is, as far as I can tell, marked as read-only, and it's
basically just a call to a CMP accessor with a little bit of string parsing
CM> relevant chunk of jboss.xml
CM>
CM> PageLocationEntity
CM> ejb/cms/PageLocationEntity
CM>
CM> get*
CM> true
CM>
CM>
CM> Can anyone help, or point me in the right direction?
CM> thanks,
CM> Chris
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julienmailto:[EMAIL PROTECTED]
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