dan benanav wrote:
>
> Evan Ireland wrote:
>
> > dan benanav wrote:
> > >
> > > ><concrete-example>
> >
> > BeanA and BeanB are installed on the same server
> >
> > client invokes methodA() on BeanA
> >
> > methodA() on BeanA starts threadA
> >
> > threadA.run() invokes methodB() on BeanB
> >
> > server crashes because BeanB doesn't have the correct thread context
> > (some expected values in thread-local storage are missing)
> >
> > </concrete-example>
> >
>
> If I were to invoke a bean on methodB() on BeanB from threadA I would look up the
>home
> object for BeanB, get the bean object and then invoke the method.
> Context initialContext = new InitialContext();
> BeanBHome beanBHome =
>(BeanBHome)narrow(initialContext.lookup(�java:comp/env/ejb/beanB�),
> BeanBHome.class);
> beanB = beanBHome.findByPrimaryKey(1);
> beanB.methodB();
>
> This would start a new transaction.
> What would be wrong with that?
The naming context object may be aware of whether or not it is running within
the server (or just in a client), and the lookup call could crash the server!
> So the call to methodB does not occur in the same transaction context as the call to
> methodA.
The specification is written in such a way as to allow server/container
vendors to attach arbitrary container-stuff as thread-local data in
container-managed threads. Any attempt to use the server's EJB infrastructure
from within a user-managed thread may result in the server attempting to locate
the container-stuff for the invoking thread, even if that thread is acting only
as a client to other beans. User-managed threads don't have any container-stuff,
thereby it might not work.
> dan
--
________________________________________________________________________________
Evan Ireland Sybase EA Server Engineering [EMAIL PROTECTED]
Wellington - New Zealand +64 4 934-5856
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