JNDI Protocol for Websphere MQ

Hi,
I am able to send/retrive messages to WebSphere MQ using filesystem-based implementation in simple java class. Now I want to send/retrive message from ODI JMS Queue technology. In Topology Manager, When I create Data Server for JMS Queue then JNDI Tab is aksing about JNDI Protocol. Please suggest me which protocol is suitable for filesystem-based implementation.
Or suggest me another way to doing this JOB.

It is plainly documented in the OC4J 9.0.4 Admin Guide:
http://download-west.oracle.com/docs/cd/B10464_01/web.904/b10326/jms.htm#1020236
We have it running in production just fine. The only "gotcha" you have to watch out for is when MQ goes down, the OC4J container will throw NullPointerExceptions until you restart the MDB listening to MQ. In 9.0.4 Enterprise, this means bringing down your entire instance (since you can't stop an individual app, so caveat emptor).
HTH,
-- /v\atthew

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JAVA client JNDI lookup for EJB session in cluster in WLS 5.1

The documentation says :
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          Hashtable ht = new Hashtable();
          ht.put(Context.INITIAL_CONTEXT_FACTORY,
          "weblogic.jndi.WLInitialContextFactory");
          ht.put(Context.PROVIDER_URL, "t3://mycluster:7001");
          try {
          Context ctx = new InitialContext(ht);
          // Do the client's work
          catch (NamingException ne) {
          // A failure occurred
          finally {
          try {ctx.close();}
          catch (Exception e) {
          // a failure occurred
          where "mycluster" is the DNS name of my cluster. My DNS server (Windows 200
          DNS server) use round robin
          to call alernatively all the wls server node in "mycluster" and it's OK. The
          two servers of my cluster
          are called alternatively for my EJB session stateless.
          Now I unplug one of the two nodes of my cluster and the remaining server is
          called only 2 times
          and not after.
          Questions :
          -is the load balancing between the nodes of mycluster only rely on DNS or
          is there an internal
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          - do I need to obtain a new reference on JNDI Context for each call ?
          Thank's a lot.
          Farid Bellameche.


          I too have the same problem. My scenario is :
          I have the web tier architecture away from cluster. All ejbs are in cluster
          running in two seperate machines. We have a factory class running in
          webtier(we use servlet in this tier) which obtains home interface only once
          and stores it for future reference. When ever we need the remoteobject stub,
          we ask the factory class and which in turn uses the stored home interface to
          get the same.
          In the webtier, I list all the servers in the cluster as a part of url as
          mentioned by you.
          I started the web tier as well as Object tier cluster. I could see the
          request coming in both the machines in the cluster for the ejb. But When I
          bring one the server in the cluster,
          1. Web tier throws an exception saying that it could not connect
          to server using t3.
          2. The other machine which is running the server, also says
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          using protocol t3.
          It looks like I am able to get load balance. But I am not able to get the
          fail over to be working.
          In the weblogic-ejb-jar.xml, I added the following.
          <clustering-descriptor>
          <home-is-clusterable>true</home-is-clusterable>
          <home-load-algorithm>round-robin</home-load-algorithm>
          </clustering-descriptor>
          I compiled and added the .jar file. So the jar file now has replica aware
          stubs.
          Could any one of you help me for why the fail over is not working?
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          "Giri Alwar" <[email protected]> wrote in message
          news:[email protected]...
          > Farid,
          > (1) Yes, the stub has the logic to perform load-balancing and
          fail-over.
          > (2) In almost all cases, no. You can get the context once, store it
          and
          > use it thereafter. Please refer to
          > http://www.weblogic.com/docs51/cluster/concepts.html#1025061 for more
          info.
          >
          > A couple of notes on your situation. From what you are describing, your
          > Windows DNS server is setup to serve only one IP from the cluster (using
          > round-robin) as opposed to a list of all IP's in the cluster. Hence, the
          > initial context you obtain is tied to a single server in the cluster (the
          > one returned by the DNS). The weblogic implementation on the client side
          has
          > no idea of the existence of the other servers in the cluster. This is not
          a
          > cluster aware context. To obtain a cluster aware context, either list all
          > the IP's in the URL like t3://server1,server2,server3:7001 or have
          > "mycluster" return a list of all servers in the cluster.
          >
          > Giri
          >
          >
          > "Farid Bellameche" <[email protected]> wrote in message
          > news:[email protected]...
          > > The documentation says :
          > >
          > > to obtain a Context for JNDI lookup do the following :
          > > Hashtable ht = new Hashtable();
          > > ht.put(Context.INITIAL_CONTEXT_FACTORY,
          > > "weblogic.jndi.WLInitialContextFactory");
          > > ht.put(Context.PROVIDER_URL, "t3://mycluster:7001");
          > > try {
          > > Context ctx = new InitialContext(ht);
          > > // Do the client's work
          > > }
          > > catch (NamingException ne) {
          > > // A failure occurred
          > > }
          > > finally {
          > > try {ctx.close();}
          > > catch (Exception e) {
          > > // a failure occurred
          > > }
          > > }
          > >
          > > where "mycluster" is the DNS name of my cluster. My DNS server (Windows
          > 200
          > > DNS server) use round robin
          > > to call alernatively all the wls server node in "mycluster" and it's OK.
          > The
          > > two servers of my cluster
          > > are called alternatively for my EJB session stateless.
          > > Now I unplug one of the two nodes of my cluster and the remaining server
          > is
          > > called only 2 times
          > > and not after.
          > >
          > > Questions :
          > > -is the load balancing between the nodes of mycluster only rely on DNS
          > or
          > > is there an internal
          > > mecanism in EJB sub to try one server then an other ?
          > >
          > > - do I need to obtain a new reference on JNDI Context for each call ?
          > >
          > >
          > > Thank's a lot.
          > >
          > > Farid Bellameche.
          > >
          > >
          > >
          > >
          >
          >

JNDI params for (default) J2EE naming service.

Dear All,
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java.naming.provider=???
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Regards,
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hi
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then u passs this properties obj or the hashtable to the
Context context = new InitialContext(props/hash);
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HI,
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Shaf,
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          Hi all,
          in Weblogic, in a typical scenario, do a client provide exactly
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          In some EJB implementations, a JNDI lookup for UserTransaction
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          have one static reference which is set when the client starts.
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          Marek Prochazka
          Distributed Systems Research Group
          Department of Software Engineering
          Charles University, Faculty of Mathematics and Physics
          Malostranske namesti 25, 118 00 Prague 1, Czech Republic
          phone: +420-2-2191 4236
          http://nenya.ms.mff.cuni.cz/thegroup/


Actually, UserTransaction is a singleton and it's not a transaction. It's just
          very mis-named.
          It should be called UserTransactionManager or UserInterfaceToJTA.
          The actual transaction is javax.transaction.Transaction.
          -- Rob
          Cameron Purdy wrote:
          > Within a transaction, it is different instances? For example, if you call
          > it two times one right after another?
          >
          > A transaction is a unit of work. I understand why the transaction object
          > changes from transaction to transaction, since a single transaction object
          > (UserTransaction) represents exactly one transaction. Why would it be a
          > singleton? It is not a transaction manager.
          >
          > Peace,
          >
          > --
          > Cameron Purdy
          > Tangosol, Inc.
          > http://www.tangosol.com
          > +1.617.623.5782
          > WebLogic Consulting Available
          >
          > "Sarita" <[email protected]> wrote in message
          > news:[email protected]...
          > >
          > > Hi Priscilla--
          > >
          > > This is not the behavior that I'm seeing, and I'm perplexed.
          > > Every time I request a UserTransaction from JNDI, I receive a
          > > a different instance. Should the value immediately returned by JNDI be
          > the singleton
          > > instance? If not, then how do I retrieve the singleton instance?
          > >
          > > I would like a session bean to start a transaction, and then call a method
          > on another
          > > session bean (which should operate under the same transaction). How does
          > the second
          > > session bean grab the correct transaction object? Is that possible?
          > >
          > > Thanks In Advance,
          > > Sarita
          > >
          > > "Priscilla Fung" <[email protected]> wrote:
          > > >
          > > >Hi Marek,
          > > >
          > > >In Weblogic 6.0, JNDI lookup of UserTransaction returns a reference to
          > the
          > > >singleton
          > > >Transaction Manager instance, which is thread-safe and can be used from
          > > >multiple
          > > >threads for transaction demarcations etc.
          > > >
          > > >-- Priscilla Fung, BEA Systems, Inc.
          > > >
          > > >"Marek Prochazka" <[email protected]> wrote:
          > > >>
          > > >>Hi all,
          > > >>
          > > >>in Weblogic, in a typical scenario, do a client provide exactly
          > > >>one JNDI lookup for the UserTransaction object (interface) or do
          > > >>the client have to provide a JNDI lookup for each transaction?
          > > >>
          > > >>In some EJB implementations, a JNDI lookup for UserTransaction
          > > >>returns always the same reference. For example, in JOnAS, you can
          > > >>have one static reference which is set when the client starts.
          > > >>Then, more threads can simultaneously use the same static
          > > >>UserTransaction reference without any conflict, since the
          > > >>implementation of UserTransaction recognizes, which thread invoked
          > > >>a particular method.
          > > >>
          > > >>In other words, can I make an assumption that two different JNDI
          > > >>lookups for UserTransaction returns different references or not?
          > > >>
          > > >>Thanks a lot,
          > > >>Marek Prochazka
          > > >>--------------------------------------------------------------
          > > >> Distributed Systems Research Group
          > > >> Department of Software Engineering
          > > >> Charles University, Faculty of Mathematics and Physics
          > > >> Malostranske namesti 25, 118 00 Prague 1, Czech Republic
          > > >> phone: +420-2-2191 4236
          > > >> http://nenya.ms.mff.cuni.cz/thegroup/
          > > >>--------------------------------------------------------------
          > > >>
          > > >
          > >

JNDI Protocol for Websphere MQ

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