On Tue, 2003-07-29 at 14:57, Alexey Loubyansky wrote:
> ID> the code is from xpetstore (this is not the code which fails, but is
> ID> similar). As you can see it does nothing more than create a regular
>
> Are you jeering? You offer to find a bug in a code that does not fail?
> Some threads are accessing the same set of beans in different order.
> Try to investigate it. If you are using commit option B or C, a quick
> solution could be to switch to Instance Per Transaction container
> configuration.
what does it matter if they access the beans in a different order? are
the beans locked even before starting an iteration on them? if they are
locked while iterating, aren't they released once i've stopped using
them?
thanx,
ittay
>
> alex
>
> Tuesday, July 29, 2003, 1:50:22 PM, Ittay Dror wrote:
>
> ID> On Tue, 2003-07-29 at 10:53, Alexey Loubyansky wrote:
> >> Hello Ittay,
> >>
> >> the deadlock, probably, occurs in value object creation. So, pay
> >> attention to it or post more details/code snippets.
>
> ID> ok. sorry if i've sent too little information. here is a code snippet of
> ID> how a value object is created. it is created automatically by xdoclet,
> ID> the code is from xpetstore (this is not the code which fails, but is
> ID> similar). As you can see it does nothing more than create a regular
> ID> object and copy native properties (String, Integer etc.) from self to
> ID> it. if it has a property that is itself a bean, it calls its
> ID> getXXXValue() method and sets the result in the value object.
>
> ID> public xpetstore.domain.customer.model.CustomerValue
> ID> getCustomerValue( )
> ID> {
> ID> CustomerValue = new
> ID> xpetstore.domain.customer.model.CustomerValue( );
> ID> try
> ID> {
> ID> CustomerValue.setUserId( getUserId( ) );
> ID> CustomerValue.setFirstname( getFirstname( ) );
> ID> CustomerValue.setLastname( getLastname( ) );
> ID> CustomerValue.setEmail( getEmail( ) );
> ID> CustomerValue.setTelephone( getTelephone( ) );
> ID> CustomerValue.setLanguage( getLanguage( ) );
> ID> CustomerValue.setStreet1( getStreet1( ) );
> ID> CustomerValue.setStreet2( getStreet2( ) );
> ID> CustomerValue.setCity( getCity( ) );
> ID> CustomerValue.setState( getState( ) );
> ID> CustomerValue.setZipcode( getZipcode( ) );
> ID> CustomerValue.setCountry( getCountry( ) );
> ID> CustomerValue.setCreditCardNumber( getCreditCardNumber( )
> ID> );
> ID> CustomerValue.setCreditCardType( getCreditCardType( ) );
> ID> CustomerValue.setCreditCardExpiryDate(
> ID> getCreditCardExpiryDate( ) );
> ID> if ( getAccount( ) != null )
> ID> {
> ID> CustomerValue.setAccountValue( getAccount(
> ID> ).getAccountValue( ) );
> ID> }
> ID> }
> ID> catch ( Exception e )
> ID> {
> ID> throw new javax.ejb.EJBException( e );
> ID> }
>
> ID> return CustomerValue;
> ID> }
>
>
> >>
> >> alex
> >>
> >> Tuesday, July 29, 2003, 8:19:45 AM, Ittay Dror wrote:
> >>
> >> ID> Hi,
> >>
> >> ID> The message in the subject happens with the following scenario:
> >> ID> 1. A stateless session bean (with CMT) calls a finder of a CMP-CMT
> >> ID> entity bean.
> >> ID> 2. The session bean iterates over the collection, for each bean there,
> >> ID> it calls a method in the bean that creates a value object for the bean
> >> ID> and returns it (the method is generated by xdoclet).
> >> ID> 3. Another thread calls the same session bean method and is at stage 2
> >> ID> (the call to the session beans initiates from a Struts action object,
> >> ID> for two different browsers loading the same page).
> >>
> >> ID> The exception occures in:
> >> ID> * Message: null; CausedByException is: Application deadlock
> >> ID> detected: Two or more transactions contention.
> >>
> >> ID> at
> >> org.jboss.ejb.plugins.LogInterceptor.handleException(LogInterceptor.java:385)
> >> ID> at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:195)
> >> ID> at
> >> org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
> >> ID> at
> >> org.jboss.ejb.EntityContainer.internalInvoke(EntityContainer.java:483)
> >> ID> at org.jboss.ejb.Container.invoke(Container.java:674)
> >> ID> at
> >> org.jboss.ejb.plugins.local.BaseLocalProxyFactory.invoke(BaseLocalProxyFactory.java:353)
> >> ID> at org.jboss.ejb.plugins.local.EntityProxy.invoke(EntityProxy.java:38)
> >> ID> at $Proxy118.getValue(Unknown Source)
> >>
> >>
> >> ID> The session and entity bean both have 'required' in their transaction
> >> ID> type.
> >>
> >> ID> Thank you for your help,
> >> ID> Ittay
> >>
> >>
> >>
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--
=======================================
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User Space, R&D
Qlusters Inc.
Tel: +972-3-6081956 Fax: +972-3-6081841
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