Re: [Springframework-developer] WLS 7 and TX suspend/resume - continue.

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Thanks, Thomas - it's great to have this for 1.1 final!
=20
Did you have a chance to check whether WebLogic 8.1's UserTransaction =
object found at "java:comp/UserTransaction" implements the =
javax.transaction.TransactionManager interface too? It does so on =
WebLogic 7.0. The benefit of such a scenario is that Spring's =
JtaTransactionManager will autodetect the TransactionManager, without =
any special setup.
=20
I've documented the basic JTA setup options for popular J2EE servers in =
JtaTransactionManager's javadoc. It would be good to verify whether my =
autodetection comment just applies to WebLogic 7.0 or also to WebLogic =
8.1.
=20
Juergen
=20

________________________________

Von: spr...@li... im Auftrag =
von Thomas Risberg
Gesendet: Sa 04.09.2004 17:42
An: spr...@li...
Betreff: Re: [Springframework-developer] WLS 7 and TX suspend/resume - =
continue.

Juergen, Eugene,  Dimitry, all WLS 70 users,

We now have a new WebLogicServerTransactionManagerFactoryBean.  This
bean factory looks up the ServerTransactionManagerImpl to get around the
NPE that was thrown during a "forceResume".  I based the code on the
WebSphere variant.  This has been tested on WebLogic 7.0 SP5 and checked
in.  Here is a snippet from the configuration I tested with:

   <!--  transaction manager -->
     <bean id=3D"wls7tm"
            =20
class=3D"org.springframework.transaction.jta.WebLogicServerTransactionMan=
agerFactoryBean"/>
     <bean id=3D"transactionManager"
            =20
class=3D"org.springframework.transaction.jta.WebLogicJtaTransactionManage=
r">
        <property name=3D"transactionManager">
          <ref local=3D"wls7tm"/>
        </property>
        </bean>

Thomas

Thomas Risberg wrote:

> Juergen,
>
> I'll try to implement and test a
> WebLogicServerTransactionManagerFactoryBean today.  I'll keep you =
posted.
>
> For WLS 8.1 the TxHelper.getTransactionManager method is marked as
> deprecated even though it is not documented as such in the JavaDocs.=20
> There is also a brand new method getClientTransactionManager for 8.1
> that is starting out marked as deprecated.  Go figure.  We are
> probably better off recommending the JNDI lookups for 8.1.
>
> Thomas
>
>
>
> j=FCrgen h=F6ller [werk3AT] wrote:
>
>> Thanks, Thomas! This means that there *is* a way to make it work on
>> WebLogic 7! Eugene, Dmitri, your pain finally has an end! :-)
>>
>> Regarding obtaining the TransactionManager via the TxHelper on
>> WebLogic 7: That can easily be factored out into a custom
>> FactoryBean, like we did for WebSphere (see
>> WebSphereTransactionManagerFactoryBean), to be passed into
>> JtaTransactionManager's respectively WebLogicJtaTransactionManager's
>> "transactionManager" property. So we don't need a further
>> JtaTransactionManager subclass for this, just a further
>> TransactionManager lookup strategy.
>>
>> BTW, Dmitri told me that the WebLogic UserTransaction object at
>> "java:comp/UserTransaction" implements the TransactionManager
>> interface too, but that obviously forceResume doesn't work there... I
>> assume the ClientTransactionManagerImpl is returned there, not the
>> ServerTransactionManagerImpl.
>>
>> If we can double-check that this works better than the
>> TransactionManager fetched from JNDI, I suggest to add a
>> WebLogicServerTransactionManagerFactoryBean (or a similar name),
>> clearly documenting that this is meant as an alternative to the
>> standard JNDI TransactionManager reference that WebLogic provides,
>> mainly for WebLogic 7. I wouldn't mind to do this even for the 1.1
>> final release tomorrow...
>>
>> Is the TxHelper lookup available on WebLogic 8.1 too? Of course, it
>> shouldn't be necessary there, as the standard JNDI TransactionManager
>> reference will work too. I just wonder whether it's available and
>> would work in principle: People could then configure a
>> WebLogicServerTransactionManagerFactoryBean to be able to deploy on
>> both WebLogic 7 and WebLogic 8, without adapting their Spring
>> configuration.
>>
>> Of course, such a WebLogicServerTransactionManagerFactoryBean would
>> have to be coded via reflection to avoid compile-time dependencies on
>> WebLogic, analogous to WebSphereTransactionManagerFactoryBean. Do you
>> have the chance to do this before tomorrow, Thomas?
>>
>> Juergen
>>
>>
>> ________________________________
>>
>> Von: spr...@li... im Auftrag
>> von Thomas Risberg
>> Gesendet: Sa 04.09.2004 14:30
>> An: spr...@li...
>> Betreff: Re: [Springframework-developer] WLS 7 and TX suspend/resume
>> - continue.
>>
>>
>>
>> I have done some additional testing for this issue and this is what I
>> have found.
>>
>> WebLogic exposes a client TransactionManager implementation via JNDI
>> (weblogic.transaction.internal.ClientTransactionManagerImpl) and in =
WLS
>> 7.0 it is throwing an NPE when you call forceResume (with or without =
a
>> suspended transaction that has been marked for RollbackOnly).
>>
>> They also have a different server implementation
>> (weblogic.transaction.internal.ServerTransactionManagerImpl) that is
>> returnd by a call to TxHelper.getTransactionManager().  With this TM =
the
>> force resume works as expected.
>>
>> So the workaround for now is to do the suspend/resume using the TM
>> returned by TxHelper before calling the Spring managed code.
>> Alternatively we could provide a WebLogic7JtaTransactionManager that
>> uses this method of obtaining the TM.
>>
>> I doubt that BEA will fix this issue in WLS 7.0.  They will probably
>> suggest to upgrade to 8.1 or use the TxHelper to obtain the TM.
>>
>> Thomas
>>
>>
>> j=FCrgen h=F6ller [werk3AT] wrote:
>>
>>=20
>>
>>> Ideally, WebLogic should work properly with standard JTA
>>> TransactionManager resume in all cases, not needing the proprietary
>>> forceResume call. However, the least we can expect is that
>>> forceResume works properly: You could send a corresponding bug
>>> report to BEA, for WebLogic 7.0. However, they might tell you that
>>> they fixed the issue in WebLogic 8.1...
>>>
>>> Juergen
>>>
>>>
>>> ________________________________
>>>
>>> Von: spr...@li... im
>>> Auftrag von j=FCrgen h=F6ller [werk3AT]
>>> Gesendet: Fr 03.09.2004 23:31
>>> An: spr...@li...
>>> Betreff: Re: [Springframework-developer] WLS 7 and TX suspend/resume
>>> - continue.
>>>
>>>
>>>
>>> As I already wrote in my JIRA comments: Many thanks for your
>>> efforts, Dmitri!
>>>
>>> I assume that with JtaTransactionManager, you'll get an
>>> IllegalStateException ("cannot resume rollback-only transaction" or
>>> the like), and with WebLogicJtaTransactionManager, you'll get the
>>> NPE in WebLogic code?
>>>
>>> This really seems to be a bug in WebLogic 7.0... At least it should
>>> work properly as long as not suspending a transaction that has been
>>> marked as rollback-only.
>>>
>>> Juergen
>>>
>>>
>>> ________________________________
>>>
>>> Von: spr...@li... im
>>> Auftrag von Dmitri Maximovich
>>> Gesendet: Fr 03.09.2004 23:07
>>> An: spr...@li...
>>> Betreff: [Springframework-developer] WLS 7 and TX suspend/resume -
>>> continue.
>>>
>>>
>>>
>>> I just tried WLS 7 with Spring 1.1rc2 and BMT transaction
>>> demaraction. It
>>> doesn't work with standard JtaTransactionManager or with
>>> WeblogicJtaTransactionManager, so something fundamentally broken in
>>> WLS7 (same
>>> NPE as described in JIRA SPR-251).
>>> Next I'll try to use WLS TransactionManager (exposed in JNDI) to
>>> suspend/resume
>>> transaction without Spring to see it it's going to work.
>>>
>>>
>>>
>>>
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>>> =20
>>
>>
>>
>>
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