Re: User Managed Transactions...

Fri, 31 Jul 2009 14:02:35 -0700

IIRC you have to bind the jcr session to the transaction. In Jackrabbit the session is actually an XASession with a getXAResource() method so you can bind the session with something like this. 

Transaction transaction = transactionManager.getTransaction();
      if (transaction != null) {
transaction.enlistResource(((XASession)session).getXAResource()); 
      }


HTH
Ian

On 31 Jul 2009, at 17:26, Gadbury wrote:



Hi all,
I have finally managed to get somewhere with jotm and Tomcat 6.0 having followed the tutorial provided in the above links. I am finally getting the 
UserTransaction via JNDI lookup (after classloader issues and naming
exceptions) and I am testing that new
InitialContext().lookup("java:comp/UserTransaction"); is an instance of 
UserTranasction.
Unfortunately, every session.save() called in between the utx.begin() and 
utx.commit() persists changes so the UserTranasction is not having an
effect. I was hoping that session.save() would not persist changes in the scope of a UserTranasction but would ensure that node UUIDs are permanently 
assigned to new nodes.  For example:

       Session session = getSession();

       // Get user transaction (for example, through JNDI)
       UserTransaction utx = (UserTransaction) new
InitialContext().lookup("java:comp/UserTransaction");

       JcrUserDao userDao = new JcrUserDao();
       JcrProductDao productDao = new JcrProductDao();

       utx.begin();

       Node newUserNode = userDao.create(aUser, session);

       session.save();

       String UUID = newUserNode.getUUID();

       Node newProductNode = productDao.create(aProduct, session);

       session.save();

       utx.commit();
If I step through the above code in debug within Eclipse, and terminate the Tomcat server after the first session.save() but before the utx.commit(), I 
can see that the the changes are made by the first Dao method call
userDao.create(aUser, session) are persisted.
So far I have put all the required jotm jars in %TOMCAT_HOME%/lib from the 
distribution bundle jotm 2.1.4.

My context.xml is configured with:

<Transaction factory="org.objectweb.jotm.UserTransactionFactory"/>


My carol.properties is saved in WEB-INF/Classes and is as follows:

# JNDI (Protocol Invocation)
carol.protocols=jrmp

# Local RMI Invocation
carol.jvm.rmi.local.call=true

# do not use CAROL JNDI wrapper
carol.start.jndi=false

# do not start a name server
carol.start.ns=false

# Naming Factory
carol.jndi.java.naming.factory.url.pkgs=org.apache.naming


Is there some further configuration required?  No exceptions are being
thrown any more and the UserTransaction is retrieved via JNDI lookup yet the 
UserTranasction appears not to be functioning as expected.
Any advice would be greatly appreciated. Thanks for your time. Regards, 

James.



Vijay Pandey wrote:
There might be a line break and you might not be copying the full URL. I 
just checked and the URL is alive.

-----Original Message-----
From: Gadbury [mailto:[email protected]]
Sent: Thursday, July 30, 2009 3:59 PM
To: [email protected]
Subject: RE: User Managed Transactions...
Thank you Vijay, I shall take a closer look tomorrow. By the way, the 
second
link gives me a 404.

Cheers,

James


Vijay Pandey wrote:


You might want to take a look at this



http://static.raibledesigns.com/downloads/howto-tomcat-jotm.html#5.5-config


along with this



http://www.nabble.com/Re%3A-UserTransaction%2C-JOTM-and-Tomcat-5.5.x-p288894

3.html

Vijay

-----Original Message-----
From: Gadbury [mailto:[email protected]]
Sent: Thursday, July 30, 2009 2:17 PM
To: [email protected]
Subject: Re: User Managed Transactions...


Hi again all.
I have been trying to get javax.transaction.UserTransaction working by 
JNDI
lookup.  I use Eclipse Galileo and Tomcat 6.0.  I am trying trying
retreive
a UserTransaction as follows  (I have tried both):

UserTransaction utx = new
InitialContext().lookup("java:comp/UserTransaction");

UserTransaction utx = new
InitialContext().lookup("java:comp/env/UserTransaction");
However, an exception is thrown stating that I must setup a system or environment property, or the application context. Do I need to configure the resource and / or environment elements in context.xml? For example, 
the
resource configuration:

<context>
<Resource name="UserTransaction" auth="Container"
   type="javax.transaction.UserTransaction"/>
 <ResourceParams name="UserTransaction">
   <parameter>
     <name>factory</name>
     <value>org.objectweb.jotm.UserTransactionFactory</value>
   </parameter>
   <parameter>
     <name>jotm.timeout</name>
     <value>60</value>
   </parameter>
 </ResourceParams>
</context>

Does Tomcat 6.0 support UserTransaction by JNDI, or do I need to use
another
technology such as JOTM or Jencks? Ideally I wouldn't have to install 
and
configure one of the other technologies.

Thanks for reading.  Kind regards,

James
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