Unfortunately I dont have any experience of JOTM, so I dont know if it
will work with Jackrabbit. I do know that Geronimo's JTA works. There
was another one mentioned on the lists a while back. JOTM says is does
support XA so *should* work with Jackrabbit... if you an hold of a
functional transaction manager.
There is a JMS example on the JOTM site that uses XA, (might help ?)
Ian
On 3 Aug 2009, at 11:50, Gadbury wrote:
Thank you Ian for your response. I appreciate it. Unfortunately, I
am now a
bit lost, going around in circles and banging my head against a
brick wall
:)
I am using Tomcat 6.0 + JOTM 2.1.4 (also, I am not using spring-
modules-jcr)
and I am able to get my UserTransaction via JNDI (it is casted from an
org.objectweb.jotm.Current object, which implements javax.transaction
TransactionManager and UserTransaction interfaces). I have also tried
casting the Current object to TransactionManager and calling
transactionManager.getTransaction(), but no Transaction is returned.
I'm not sure what else to try. I thought Jackrabbit did support
user and
container-managed transactions...? There seems to be no easy way
for me to
retrieve a Transaction or TransactionManager object with the setup I
am
using (although most likely I am just being stupid!). I have had a
look at
the container-managed transactions part of the JCR 1.0 spec
(associating the
resource with a global transaction using the myXAResource.start(xid,
TMNOFLAGS) and myXAResource.end(xid, TMSUSPEND); ), but that seems a
bit
heavy-weight. By the way, what happened to the XIDHelper class?
Is there anyone out there that uses Tomcat, JOTM and transactions?
Ian Boston wrote:
I will have a go at answering, but no guarantees :)
On 1 Aug 2009, at 11:56, Gadbury wrote:
Hi Ian,
Thank you for the pointers. Was I wrong to use UserTransaction?
I think (but I could be completely wrong), UserTransaction is
generally a wrapper for the TransactionManager so when you create a
user transaction jndi will associate the user transaction with the
TransactionManager, and then the UserTransaction will proxy the
remaining calls through to the TransactionManager (at least thats the
case with Geronimo)
You need to bind the JCR session into the transaction, which cant be
done with a UserTransaction where the wiring is within the
TransactionManager impl, usually bound to the JDBC data source. So
your right to use UserTransaction for JDBC/Datasource, but wrong to
use it for JCR. (IIRC)
What type
of tranasction is that in your example It looks to me like you're
using
Transaction and TransactionManager interfaces from
javax.transaction.
yes
How
do I get a TransactionManager instance? Can I still use JNDI or is
there an
alternative (in fact, JNDI presents me a problem with unit testing
as
without the web application running on the Tomcat server, the JNDI
lookup
cannot get the UserTransaction instance) ?
you *should* be able to look up the transaction manager from jNDI
*or*
for unit testing, create a new instance of the TransactionManager. I
have been using Geronimo in OSGi with Sling/Jackrabbit and its just a
new GeronimoTransactionManager(defaultTransactionTimeoutSeconds); to
get one (only one per transaction context)
Sorry for the silly questions. Thanks for your time. Regards,
James
Ian Boston wrote:
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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