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From "Patrick Linskey" <plins...@bea.com>
Subject RE: WebSphere and transaction managers
Date Tue, 20 Feb 2007 10:45:26 GMT
> Does OpenJPA need to provide this level of support for
> all TM's?  That's what I meant by my question.

I don't think that OpenJPA *needs* to, but it certainly will improve the
out-of-the-box experience for WAS users. 

Are there any public WAS hooks that we can use to automatically deploy a
SLSB into a WAS environment during OpenJPA startup?

In any event, there's an easy workaround right now (use the internal WAS
methods, as outlined in the JIRA), and there will be another easy
workaround soon (use non-jta-data-source).

-Patrick

-- 
Patrick Linskey
BEA Systems, Inc. 

_______________________________________________________________________
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> -----Original Message-----
> From: Kevin Sutter [mailto:kwsutter@gmail.com] 
> Sent: Monday, February 19, 2007 6:54 PM
> To: open-jpa-dev@incubator.apache.org
> Subject: Re: WebSphere and transaction managers
> 
> Craig,
> 
> On 2/19/07, Craig L Russell <Craig.Russell@sun.com> wrote:
> >
> >
> > On Feb 19, 2007, at 4:37 PM, Kevin Sutter wrote:
> >
> > > On 2/19/07, Patrick Linskey <plinskey@bea.com> wrote:
> > >>
> > >>
> > >> Maybe we should add a method to our ManagedRuntime interface to
> > >> accept a
> > >> Runnable that should be run in a separate transaction, 
> and migrate
> > >> our
> > >> code to use that approach. That way, the WASManagedRuntime could
> > >> do what
> > >> Craig outlined, and other ManagedRuntime impls could retain their
> > >> current behavior.
> > >
> > >
> > > Although this approach is probably workable, this sounds more
> > > complicated
> > > than just requiring the use of the non-jta-data-source element.
> > > WebSphere
> > > will eventually support the non-jta-data-source (supposedly in the
> > > next Beta
> > > of the EJB3 Feature Pack).
> >
> > This would be welcome news, indeed.
> >
> > > Wouldn't that be the preferred (and spec
> > > compliant) method of "nesting" transactions?
> >
> > I think so.
> > >
> > > I suppose since OpenJPA already supports this "suspension" via
> > > other TM's,
> > > is it our desire to support this mechanism for all TM's?
> >
> > I think so. Is WAS the only application server that doesn't support
> > non-JTA DataSource?
> 
> 
> Craig, I meant the ability to suspend a transaction.  It 
> seems that OpenJPA
> has provided for suspending of transactions via various API's (some
> external, some internal).  So, it seems that some TM's allow 
> for suspension
> of in-flight transactions, while others (like WAS) does not.  
> At least not
> via public API's.  Does OpenJPA need to provide this level of 
> support for
> all TM's?  That's what I meant by my question.
> 
> Craig
> >
> > >
> > > Kevin
> > >
> > >
> > > On 2/19/07, Patrick Linskey <plinskey@bea.com> wrote:
> > >>
> > >> > > I would have to better understand OpenJPA's need for the
> > >> transaction
> > >> > > suspension before determining whether there are alternatives
> > >> > > available.
> > >>
> > >> The use case is that if we can suspend the tx, then the 
> user doesn't
> > >> need to provide a non-JTA data source.
> > >>
> > >> > The idea is to create an EJB component solely for the 
> purpose of
> > >> > suspending a transaction. This could be a Stateless Session
> > >> > Bean that defines a method declared as Transaction Not 
> Supported.
> > >>
> > >> Interesting. We could even mark the method as @RequiresNew, thus
> > >> letting
> > >> the container take care of demarcation. Certainly an interesting
> > >> approach for providing similar ease-of-use in a WebSphere
> > >> environment.
> > >>
> > >> Maybe we should add a method to our ManagedRuntime interface to
> > >> accept a
> > >> Runnable that should be run in a separate transaction, 
> and migrate
> > >> our
> > >> code to use that approach. That way, the WASManagedRuntime could
> > >> do what
> > >> Craig outlined, and other ManagedRuntime impls could retain their
> > >> current behavior.
> > >>
> > >> -Patrick
> > >>
> > >> --
> > >> Patrick Linskey
> > >> BEA Systems, Inc.
> > >>
> > >> 
> _____________________________________________________________________
> > >> __
> > >> Notice:  This email message, together with any attachments, may
> > >> contain
> > >> information  of  BEA Systems,  Inc.,  its subsidiaries  and
> > >> affiliated
> > >> entities,  that may be confidential,  proprietary,  copyrighted
> > >> and/or
> > >> legally privileged, and is intended solely for the use of the
> > >> individual
> > >> or entity named in this message. If you are not the intended
> > >> recipient,
> > >> and have received this message in error, please 
> immediately return
> > >> this
> > >> by email and then delete it.
> > >>
> > >> > -----Original Message-----
> > >> > From: Craig.Russell@Sun.COM [mailto:Craig.Russell@Sun.COM]
> > >> > Sent: Monday, February 19, 2007 8:33 AM
> > >> > To: open-jpa-dev@incubator.apache.org
> > >> > Subject: Re: WebSphere and transaction managers
> > >> >
> > >> > It is possible to suspend a transaction by the standard Java EE
> > >> > technique. Unfortunately, this might be considered a hack, but
> > >> AFAIK
> > >> > it's perfectly legal.
> > >> >
> > >> > The idea is to create an EJB component solely for the 
> purpose of
> > >> > suspending a transaction. This could be a Stateless Session
> > >> > Bean that
> > >> > defines a method declared as Transaction Not 
> Supported. The method
> > >> > invocation would contain a runnable as an argument which the
> > >> > execution of the method would then run. Once the runnable
> > >> completed,
> > >> > returning from the method would resume the suspended
> > >> transaction. If
> > >> > needed, an Object returned from the method could contain the
> > >> results
> > >> > of the method.
> > >> >
> > >> > Craig
> > >> >
> > >> > On Feb 19, 2007, at 8:14 AM, Kevin Sutter wrote:
> > >> >
> > >> > > The WebSphere Transaction API does not allow for 
> suspension of a
> > >> > > transaction.  Even if we move to the "official" JPA
> > >> transaction API
> > >> > > (TransactionSynchronizationRegistry), there is no 
> suspend method
> > >> > > available.
> > >> > > I would have to better understand OpenJPA's need for the
> > >> transaction
> > >> > > suspension before determining whether there are alternatives
> > >> > > available.
> > >> > >
> > >> > > On 2/16/07, Patrick Linskey <plinskey@bea.com> wrote:
> > >> > >>
> > >> > >> From what the user said, it sounds like another solution
> > >> > is to use a
> > >> > >> different ManagedRuntime that allows suspension. My guess
is
> > >> that
> > >> > >> this
> > >> > >> is not an "official" IBM API, and is the reason 
> that we're not
> > >> > >> using it.
> > >> > >> Is there some other official means by which we could change
> > >> > >> WASManagedRuntime to allow suspend etc.?
> > >> > >>
> > >> > >> In short, if we solve OPENJPA-149, then we have the easiest-
> > >> of-all
> > >> > >> pathways covered, and OPENJPA-153 is less important.
> > >> > >>
> > >> > >> -Patrick
> > >> > >>
> > >> > >> --
> > >> > >> Patrick Linskey
> > >> > >> BEA Systems, Inc.
> > >> > >>
> > >> > >>
> > >> >
> > >> 
> _____________________________________________________________________
> > >> > >> __
> > >> > >> Notice:  This email message, together with any 
> attachments, may
> > >> > >> contain
> > >> > >> information  of  BEA Systems,  Inc.,  its subsidiaries  and
> > >> > >> affiliated
> > >> > >> entities,  that may be confidential,  proprietary,  
> copyrighted
> > >> > >> and/or
> > >> > >> legally privileged, and is intended solely for the 
> use of the
> > >> > >> individual
> > >> > >> or entity named in this message. If you are not the intended
> > >> > >> recipient,
> > >> > >> and have received this message in error, please
> > >> > immediately return
> > >> > >> this
> > >> > >> by email and then delete it.
> > >> > >>
> > >> > >> > -----Original Message-----
> > >> > >> > From: Albert Lee [mailto:allee8285@gmail.com]
> > >> > >> > Sent: Friday, February 16, 2007 11:21 AM
> > >> > >> > To: open-jpa-dev@incubator.apache.org
> > >> > >> > Subject: Re: WebSphere and transaction managers
> > >> > >> >
> > >> > >> > This is known problem in WAS. The reason is data source
> > >> > >> > created in WAS is
> > >> > >> > always enlisted in the current global 
> transaction, therefore
> > >> > >> > RESOURCE_LOCAL
> > >> > >> > persistence unit using WAS data source triggers 
> the observed
> > >> > >> behavior.
> > >> > >> >
> > >> > >> > This limitation will be corrected in the WAS EJB3 Feature
> > >> > >> > Pack and future
> > >> > >> > releases.
> > >> > >> >
> > >> > >> > Immediate solution is not to specify the
> > >> > non-jta-data-source in the
> > >> > >> > persistence unit but replace with connection information
> > >> > >> > using properties
> > >> > >> >   openjpa.ConnectionUserName
> > >> > >> >   openjpa.ConnectionPassword
> > >> > >> >   openjpa.ConnectionURL
> > >> > >> >   openjpa.ConnectionDriverName
> > >> > >> >
> > >> > >> > It is not the ideal solution, but functional.
> > >> > >> >
> > >> > >> > Albert Lee
> > >> > >> >
> > >> > >> > On 2/16/07, Patrick Linskey <plinskey@bea.com>
wrote:
> > >> > >> > >
> > >> > >> > > Hi,
> > >> > >> > >
> > >> > >> > > It looks like the new WebSphere transaction 
> manager lookup
> > >> > >> code is
> > >> > >> > > missing some functionality available elsewhere.
> > >> > >> > >
> > >> > >> > > See OPENJPA-149
> > >> > >> > (https://issues.apache.org/jira/browse/OPENJPA-149)
and
> > >> > >> > > OPENJPA-153 (https://issues.apache.org/jira/browse/
> > >> > >> OPENJPA-153) for
> > >> > >> > > details.
> > >> > >> > >
> > >> > >> > > The key problems are:
> > >> > >> > >
> > >> > >> > > OPENJPA-149: the WASManagedRuntime class throws
> > >> exceptions on
> > >> > >> some
> > >> > >> > > methods, preventing OpenJPA from being able to
suspend
> > >> > >> transactions
> > >> > >> > >
> > >> > >> > > OPENJPA-153: even when specifying a non-JTA data
source,
> > >> > >> > the data source
> > >> > >> > > returned does not allow commits. It does seem like
the
> > >> > >> > behavior of the
> > >> > >> > > data source is at least a bit different than 
> the JTA data
> > >> > >> > source, since
> > >> > >> > > OpenJPA is able to call setAutoCommit().
> > >> > >> > >
> > >> > >> > > These seem like usability issues with WAS. I'm

> hoping that
> > >> > >> > someone with
> > >> > >> > > more WAS knowledge than me can resolve the 
> issues easily.
> > >> > >> > Any takers?
> > >> > >> > >
> > >> > >> > > -Patrick
> > >> > >> > >
> > >> > >> > > --
> > >> > >> > > Patrick Linskey
> > >> > >> > > BEA Systems, Inc.
> > >> > >> > >
> > >> > >> > >
> > >> > >> > 
> ______________________________________________________________
> > >> > >> > _________
> > >> > >> > > Notice:  This email message, together with any

> attachments,
> > >> > >> > may contain
> > >> > >> > > information  of  BEA Systems,  Inc.,  its 
> subsidiaries  and
> > >> > >> >  affiliated
> > >> > >> > > entities,  that may be confidential,  proprietary,
> > >> > >> > copyrighted  and/or
> > >> > >> > > legally privileged, and is intended solely for

> the use of
> > >> > >> > the individual
> > >> > >> > > or entity named in this message. If you are not
the
> > >> > >> > intended recipient,
> > >> > >> > > and have received this message in error, please

> immediately
> > >> > >> > return this
> > >> > >> > > by email and then delete it.
> > >> > >> > >
> > >> > >> >
> > >> > >>
> > >> >
> > >> > Craig Russell
> > >> > Architect, Sun Java Enterprise System http://java.sun.com/
> > >> products/jdo
> > >> > 408 276-5638 mailto:Craig.Russell@sun.com
> > >> > P.S. A good JDO? O, Gasp!
> > >> >
> > >> >
> > >>
> >
> > Craig Russell
> > Architect, Sun Java Enterprise System 
> http://java.sun.com/products/jdo
> > 408 276-5638 mailto:Craig.Russell@sun.com
> > P.S. A good JDO? O, Gasp!
> >
> >
> >
> 

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