Calrification for Weblogic Clustering

Our J2EE application is multitiered where JSPs&Servlets(Frontend) runs in a weblogic instance and EJBs(Backend) runs in two weblogic instances which are clustered. Here the Frontend weblogic instance and one of the clustered Backend weblogic instance are running in a same machine A and the other clustered Backend weblogic instance is running in another machine B. We had tested the following cases for Failover
Note :
please consider "JSPs&Servlets" as Frontend and "EJBs" as Backend.
Weblogic 9.2 and stateless session beans are used.
Frontend is not clustered.
Case 1:
We are doing a transaction where the request from frontend goes to one of the of the Clustered Backend weblogic instance. Before the transaction gets completed this backend weblogic instance is made to shutdown. The transaction has failed over to the another available Clustered Backend weblogic instance . The transaction had completed successfully and the Failover is working fine.
Case 2:
We are doing a transaction where the request from frontend(running in Machine A) goes to the Clustered Backend weblogic instance running in the Machine A itself. Before the transaction gets completed, the machine A is made to shutdown (i.e. both frontend and backend weblogic instance shuts down at the same time). Here the transaction has failed and could not able failover to the other available Backend weblogic instance .
Please clarify whether weblogic cluster supports the Backend failover when both the Frontend and Backend are brought down at the same time?
Any weblogic CLustering experts, please clarify...

Hi Jayesh,
Thanks very much for your reply.
I understood that your reply "You might want to consider collapsing front end (servlet & JSP) and back end (EJB) servers into a single WebLogic server for better fail over support." means that JSP&Servlet and EJB should be combined to form a single archive(EAR) which has to be deployed in single weblogic instance.
Please check whether my assumptions are correct for your suggestion on better failover.
1.The cluster configuration of JSPs&Servlet(web.xml) and EJBs(ejb-jar.xml) running in single weblogic instance will be similar to the cluster configuration of JSPs&Servlet(web.xml) and EJBs(ejb-jar.xml) running in separate weblogic instances. i.e All the configurations are same, but instead of the application running in separate weblogic instances, it will run in single weblogic instance.
2.In the URL for specifying the EJB connection from the JSP&Servlet, the cluster IP address should be used.
You have mentioned that if EJB client is not alive, the failover will not work. Please clarify how the failover will work in this case only(JSP&Servlet and EJB running in single weblogic instance and clustered).
Thanks,
Thiyagu

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"Cameron Purdy" <[email protected]> wrote in message news:<[email protected]>...
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"Neil" <[email protected]> wrote in message
news:[email protected]..
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3) Each weblogic will have its own adminserver.
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[email protected]

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Hi,
The There are basically two reasons ...for which we want Clustering:
<h3><font color=maroon>Reason - 1): Failover</font></h3>
This feature needs HttpSession replication...Failover means if a Userhas Logged in to our application and accessing some pages ...then his HttpSession Replica will be available in a Secondary WebLogic Server so...even if his Promary WebLogic Server Goes Down ...His Session data will not be lost...and client can interact with the Application without any Interruption. To Enable Failover in your Clustered Application you need to provide the <persistent-store-type>Tag inside your "<Application>/WEB-INF/weblogic.xml"
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<font color=red><b>NOTE:</b> until u dont put <persistent-store-type> Tag inside your "weblogic.xml" file...by default HttpSession replication will be disabled....because it's default value is "inMemory" means even If your Application has HttpSession ... it wont be replicated on Secondary Server.</font>
<h3><font color=maroon>Reason - 2): LoadBalancing</font></h3>
This feature has NOTHING TO DO with HttpSession replication (in general). It means simply different clients request will be processed by different WebLogic Server Instances in a Round-Robin fashion. I Think this is what you want to implement. Because your application is not using any HttpSession .So thet Application willl not have any Failover. But LoadBalancing is the Default Feature of WebLogic Cluster. U need not to do anything additionally to Achieve it.
<font color=green><b>Note:</b>Means Without Having HttpSession Objects in your Application Still u can have WebLogic Clustering Feature to get the benifit of LoadBalancing.</font>
To know more about Session Replication and it's related issues : http://weblogic-wonders.com/weblogic/2009/12/08/session-replication-issues/
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Jay SenSharma

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<Jul 29, 2006 11:22:01 PM IST> <Notice> <WebLogicServer> <BEA-000328> <Starting WebLogic Managed Server "MedRec2" for domain "clusterdomain">
<Jul 29, 2006 11:22:03 PM IST> <Error> <Cluster> <BEA-000116> <Failed to join cluster MedRecCluster at address 230.0.0.1 due to: java.net.SocketException: error setting options.
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>
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... 4 more
>
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Thanks
Raju

Hi,
Actually i tried with Weblogic 8.1 sp2 and sp4 but same problem.I just tried setting up clusters on Windows 2000 it works fine.Seems to be a problem with windows XP home.
Any idea if same problem occurs with Win XP professional?
Anyway thanx for the reply.
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Raju

WebLogic clustering within the box

          Folks,
          Is it possible to do weblogic clustering within a single UNIX box?
          For example,
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          Thanks
          - Robot


          "Majic Robot" <[email protected]> wrote:
          >
          >Folks,
          >
          >Is it possible to do weblogic clustering within a single UNIX box?
          >
          >For example,
          >
          >UNIX Machine A(10.9.44.25) have two domains mydomain1 and mydomain2.
          >
          >mydomain1 - AdminServer7001 - ManagedServer8001
          >mydomain2 - ManagedServer9001
          >
          >Is it possible to clustering for ManagedServer8001 and ManagedServer9001?
          >
          >Thanks
          >
          >- Robot
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Apache configuration for weblogic

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<Location /process>
WebLogicCluster abc:7210,xyz:7210
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Certification for Weblogic 8.1

First of all, please excuse me for the re-posting of the same topic about JMS. It was due to an error in my navigator. It was not my intention. :.-(
And now, the question. I've seen that Coherence is certified for Weblogic 7.0, but is it also certified for Weblogic 8.1? If not, which version will be?
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BYe

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