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From: Mark Struberg <struberg@yahoo.de.INVALID>
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Subject: Re: DeltaSpike Data - What application servers are supported?
Date: Wed, 10 May 2017 11:22:44 +0200
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archived-at: Wed, 10 May 2017 09:23:00 -0000

Hi Konrad, John!

Hmm not sure about ContainerManagedTransactionStrategy.=20

Look at the code, this is probably not named properly. It is essentially =
a no-op TransactionStrategy. It delegates through without doing =
something.

This is useful if you GUARANTEED have a ContainerManagedTransation in an =
outer level.=20
E.g. if you have some existing code using DeltaSpike @Transactional, and =
you know that you ALWAYS have e.g. a @Stateless @WebService calling your =
code.
We cannot rename this now because otherwise the Alternatives enabled in =
various beans.xml files would go bonkers...

So if you are about to use e.g. an @ApplicationScoped @Transactional =
bean without any EJBs involved at all, then you should rather use the =
BeanManagedUserTransactionStrategy.
This one leverages the UserTransaction functionality provided by the =
server. If a JTA Transaction is already active then it would simply do =
nothing. So in this case it really behaves the same like =
ContainerManagedTransactionStrategy.=20

But if there is NO active Transaction, then it will use the =
UserTransaction API to open a transaction and to commit/rollback on this =
very layer when leaving the intercepted method. Subsequently invoked =
@Transactional CDI beans - and even EJBs! - will just take this open =
transaction and work with it.
So this works perfectly fine in cases where you only use CDI but also =
when you wildly mix EJBs and CDI beans.
I use this in production for quite a few projects.

Note that the EntityManagerProducer you need to provide must use a =
container provided EntityManagerFactory, otherwise your EntityManager =
won't integrate with JTA.
A sample can be found here:
=
https://github.com/struberg/lightweightEE/blob/jtacdi11/backend/src/main/j=
ava/de/jaxenter/eesummit/caroline/backend/tools/EntityManagerProducer.java=
#L40


hth.

LieGrue,
strub

> Am 09.05.2017 um 01:50 schrieb John D. Ament <johndament@apache.org>:
>=20
> Konrad,
>=20
> When you specify globalAlternatives, you don't need to specify =
anything in
> beans.xml
>=20
> RE which strategy to use, it'll be the one that matches your =
transaction
> mode.  If you're using plain JTA just use
> ContainerManagedTransactionStrategy.
>=20
> John
>=20
> On Mon, May 8, 2017 at 3:56 PM Instantiation Exception <
> instantiationexception@gmail.com> wrote:
>=20
>> John,
>>=20
>> I want to clarify one thing. When I use
>> META-INF/apache-deltaspike.properties with
>> globalAlternatives.org.apache.deltaspike.jpa.spi.transaction.
>> TransactionStrategy=3Dorg.apache.deltaspike.jpa.impl.transaction.
>> ContainerManagedTransactionStrategy
>>=20
>> should I use alternative in beans.xml? And which one?
>> =
org.apache.deltaspike.jpa.impl.transaction.ContainerManagedTransactionStr
>> ategy
>> or
>> =
org.apache.deltaspike.jpa.impl.transaction.BeanManagedUserTransactionStrat=
egy
>>=20
>> Best regards,
>> Konrad
>>=20
>> On Fri, Mar 3, 2017 at 2:57 PM, John D. Ament <johndament@apache.org>
>> wrote:
>>=20
>>> Ondrej,
>>>=20
>>> I agree as well.  It definitely should be more turn key in this =
respect.
>>>=20
>>> John
>>>=20
>>> On Fri, Mar 3, 2017 at 8:53 AM Ondrej Mih=C3=A1lyi =
<ondrej.mihalyi@gmail.com>
>>> wrote:
>>>=20
>>>> Hi John,
>>>>=20
>>>> It sounds to me that DeltaSpike could be improved to make a
>> sophisticated
>>>> guess to infer the default value of this configuration from the
>> container
>>>> it is running in. At least for WildFly and maybe some other =
containers
>>>> where people report problems.
>>>>=20
>>>> Just an idea :)
>>>>=20
>>>> Ondrej
>>>>=20
>>>> 2017-03-03 12:05 GMT+01:00 John D. Ament <johndament@apache.org>:
>>>>=20
>>>>> Hi Konrad,
>>>>>=20
>>>>> What that's referring to is that you need to create a
>>>>> META-INF/apache-deltaspike.properties and add the following line:
>>>>>=20
>>>>> globalAlternatives.org.apache.deltaspike.jpa.spi.transaction.
>>>>> TransactionStrategy=3Dorg.apache.deltaspike.jpa.impl.transaction.
>>>>> ContainerManagedTransactionStrategy
>>>>>=20
>>>>> I do something similar to  you, and it works perfect.  I'm using
>> maven
>>> to
>>>>> build a WAR file, so it just goes in
>>>>> src/main/resources/META-INF/apache-deltaspike.properties
>>>>>=20
>>>>> John
>>>>>=20
>>>>> On Fri, Mar 3, 2017 at 3:38 AM Instantiation Exception <
>>>>> instantiationexception@gmail.com> wrote:
>>>>>=20
>>>>>> Hi,
>>>>>>=20
>>>>>> In my company projects we use WildFly. In the past I tried few
>> times
>>> to
>>>>> use
>>>>>> DeltaSpike Data, but it didn't work. I configured everything
>>> according
>>>> to
>>>>>> documentation. In pure CDI scenario it worked. But when I created
>>>>>> @Dependent @Repository and injected it to @Stateless EJB I got =
some
>>>>>> transaction errors when tried to call EJB methods. In
>> documentation I
>>>> see
>>>>>> warning:
>>>>>>=20
>>>>>> Some containers do not support =
BeanManagedUserTransactionStrategy!
>>> As
>>>>> JTA
>>>>>>> has still some portability issues even in Java EE 7, it might be
>>>>> required
>>>>>>> that you implement your own TransactionStrategy. We will think
>>> about
>>>>>>> providing an acceptable solution for this.
>>>>>>=20
>>>>>>=20
>>>>>> Is it about WildFly? Is WildFly supported?
>>>>>>=20
>>>>>> Best regards,
>>>>>> Konrad
>>>>>>=20
>>>>>=20
>>>>=20
>>>=20
>>=20