Tomcat 6 + Jackrabbit + transactions

[Tony Rozga <to...@neovalent.com>]

Hi,  Jackrabbit newb here:

I've found plenty of examples/mail threads that talk about deploying 
Jackrabbit as a JCA resource and how that means Jackrabbit is 
automatically aware of the JCA transactional context.  We need to 
support Tomcat 6 though and that config still confuses me as Tomcat is 
not a JCA container.

I've found several transaction manager implementations (Bitronix, 
Atomikos) that can be used in Tomcat.  If I setup on of these and start 
a UserTransaction in my code and then do some Jackrabbit ops, will 
Jackrabbit be aware of that transaction context?  Given that a 
Jackrabbit Session is the underlying XAResource, what about a single 
transaction that spans multiple Sessions?

Thanks,
Tony Rozga

Re: Tomcat 6 + Jackrabbit + transactions

[GuyPardon <gu...@atomikos.com>]

Hi,


slandelle wrote:
> 
>> It is my understanding that something like Atomikos
>> is an implementation of the JTA and could be used as that manager but it
>> is unclear how to coordinate that piece and Jackrabbit
> 

Just do the following:

-start a JTA transaction
-get the current transaction from the TransactionManager instance
-enlist the XAResource(s)
-do your transactional work
-commit the JTA transaction

The Atomikos JTA is Apache-licensed and can be used without any problems in
Jackrabbit. There is nothing to configure really, just about everything can
be based on defaults.

Best
Guy 

http://www.atomikos.com


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Re: Tomcat 6 + Jackrabbit + transactions

[sl...@excilys.com]

> Our need for transactions is based on the fact that we are using
> multiple Jackrabbit workspaces and need transactional semantics for
changes that span multiple workspaces.
Just one question : what do you use several workspaces for? I ask this
question because people tend to have workspaces for seperating fonctionnal
perimeters. See http://wiki.apache.org/jackrabbit/DavidsModel Rule #3.

>
> I think I could code this project 5 times before I learned enough about
> Spring to use it :)  I was hoping to find a lighter-weight transaction
> manager that could coordinate changes to multiple workspaces.  All of my
> reading has given me the impression that there is some combination of
> things out there that can accomplish this in Tomcat6.
> org.apache.jackrabbit.core.XASessionImpl implements XAResource which can
> be manipulated individually (like
> org.apache.jackrabbit.core.UserTransactionImpl does) or in concert like a
> javax.transaction.Transaction does by enlisting multiple XAResources in a
> single transaction.  It is my understanding that something like Atomikos
> is an implementation of the JTA and could be used as that manager but it
> is unclear how to coordinate that piece and Jackrabbit.

I really should give Spring a shot!
It provides you with a handly transaction support, can provide you with a
LocalTransactionManager (the one for Jackrabbit is not in Spring Core but
in SPring modules) and can provide a JTA support (in this case, you have
to feed your own TransactionManager).
If you want to work with several workspaces, you'll probably have to
customize some stuff because.

For application that don't run on a complete app-server, I use Jencks as a
JTA provider. I find it much cleaser and easier to configure that
Atomikos.

BR,

Stéphane Landelle

Re: Tomcat 6 + Jackrabbit + transactions

[Tony Rozga <to...@neovalent.com>]

slandelle@excilys.com wrote:
> You're confusing JTA and JCA (even if these 2 are often linked I agree).
> Let's take the problem from start : you want transactions! :)
>   
yes, transactions! :)
> Do you need 2PC? How do you intend to work with your transactions? Spring?
>
>   
Our need for transactions is based on the fact that we are using 
multiple Jackrabbit workspaces and need transactional semantics for 
changes that span multiple workspaces.

I think I could code this project 5 times before I learned enough about 
Spring to use it :)  I was hoping to find a lighter-weight transaction 
manager that could coordinate changes to multiple workspaces.  All of my 
reading has given me the impression that there is some combination of 
things out there that can accomplish this in Tomcat6.  
org.apache.jackrabbit.core.XASessionImpl implements XAResource which can 
be manipulated individually (like 
org.apache.jackrabbit.core.UserTransactionImpl does) or in concert like 
a javax.transaction.Transaction does by enlisting multiple XAResources 
in a single transaction.  It is my understanding that something like 
Atomikos is an implementation of the JTA and could be used as that 
manager but it is unclear how to coordinate that piece and Jackrabbit.

Tony


> Stéphane Landelle
>
>
> Le Lun 8 décembre 2008 19:03, Tony Rozga a écrit :
>   
>> Hi,  Jackrabbit newb here:
>>
>>
>> I've found plenty of examples/mail threads that talk about deploying
>> Jackrabbit as a JCA resource and how that means Jackrabbit is
>> automatically aware of the JCA transactional context.  We need to support
>> Tomcat 6 though and that config still confuses me as Tomcat is
>> not a JCA container.
>>
>> I've found several transaction manager implementations (Bitronix,
>> Atomikos) that can be used in Tomcat.  If I setup on of these and start
>> a UserTransaction in my code and then do some Jackrabbit ops, will
>> Jackrabbit be aware of that transaction context?  Given that a
>> Jackrabbit Session is the underlying XAResource, what about a single
>> transaction that spans multiple Sessions?
>>
>> Thanks,
>> Tony Rozga
>>
>>
>>
>>
>>     
>
>
>
>   

Re: Tomcat 6 + Jackrabbit + transactions

[sl...@excilys.com]

You're confusing JTA and JCA (even if these 2 are often linked I agree).
Let's take the problem from start : you want transactions! :)

Do you need 2PC? How do you intend to work with your transactions? Spring?

Stéphane Landelle


Le Lun 8 décembre 2008 19:03, Tony Rozga a écrit :
> Hi,  Jackrabbit newb here:
>
>
> I've found plenty of examples/mail threads that talk about deploying
> Jackrabbit as a JCA resource and how that means Jackrabbit is
> automatically aware of the JCA transactional context.  We need to support
> Tomcat 6 though and that config still confuses me as Tomcat is
> not a JCA container.
>
> I've found several transaction manager implementations (Bitronix,
> Atomikos) that can be used in Tomcat.  If I setup on of these and start
> a UserTransaction in my code and then do some Jackrabbit ops, will
> Jackrabbit be aware of that transaction context?  Given that a
> Jackrabbit Session is the underlying XAResource, what about a single
> transaction that spans multiple Sessions?
>
> Thanks,
> Tony Rozga
>
>
>
>