Round Robin doesn't work in Bea Weblogic Cluster

hello!
          we are using a weblogic (V5.1 SP8) cluster in the following configuration:
          2 Weblogic App-Servers as Servlet Containers.
          4 Weblogic App-Servers as EJB Containers.
          if a client connects to the first servlet - server, round robin between the
          4 EJB-servers behind doesn't work. It seems that the servlet-server is
          pinned to one EJB-server all the time.
          If we kill the second servlet-server as from now on round robin works in the
          EJB-server cluster like we expected.
          As we changed this configuration and also use an IPlanet webserver (one
          instance) with the weblogic proxy-plugin which connects to the
          servlet-cluster (2 instances)... round robin is working properly in the
          EJB-server cluster when the client connects to the IPlanet-server....
          what is the problem, why doesn't round robin work in the first
          configuration? any suggestions?
          Torsten Jenkner
          

Okay, is it that the round-robining is not perfect (i.e., it doesn't send the
          first request to server1 and the second request to server2 and so on) or is it
          sending every request to one server?
          Torsten Jenkner wrote:
          > yes exactly Robert that's it!
          >
          > Torsten
          >
          > "Robert Patrick" <[email protected]> schrieb im Newsbeitrag
          > news:[email protected]...
          > > I don't understand this. Are you saying that with servlet node 1 or
          > servlet
          > > node 2 running by themselves that RR works fine but once you start both
          > > together, it does not?
          > >
          > > This sounds like a case for support...
          > > Robert
          > >
          > > Torsten Jenkner wrote:
          > >
          > > > > > it is always the same stub in our case. Also the round robin in the
          > EJB
          > > > > > cluster does with the same java classes but does not if the servlet
          > > > cluster
          > > > > > consits of two nodes. So it seems to be a configuration problem, but
          > > > which
          > > > > > one?
          > > > >
          > > > > Hmm.... I don't quite understand this last statement about the EJB
          > and
          > > > servlet
          > > > > cluster, could you explain a little more?
          > > > >
          > > > > Thanks,
          > > > > Robert
          > > > >
          > > >
          > > > if you use 2 servlet cluster nodes round robin between the
          > servlet-cluster
          > > > and the ejb-cluster doesn't work. if i kill the second servlet-node it
          > works
          > > > fine. so my thought was it has to be a configuration problem, because RR
          > > > does with one servlet-node. ok?
          > > >
          > > > Torsten Jenkner
          > >
          

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    Login - No existe informacion de session ...obteniendo perfil del usuario
    Login - Creando objeto en session ... (InteresadoValue - TipoUsuario - Rol)
    Logged In...as secofi2
    Validando session para tramite maquila (namespace):maquila3
    <Jan 22, 2003 4:09:54 PM CST> <Error> <HTTP> <[WebAppServletContext(30282805,cli
    entes,/clientes)] Root cause of ServletException
    java.lang.NullPointerException:
    at jsp_servlet._framework._maquila.__generales._jspService(__generales.j
    ava:307)
    at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:262)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:198)
    at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispat
    cherImpl.java:250)
    at com.bea.p13n.appflow.webflow.servlets.internal.WebflowServlet.doGet(W
    ebflowServlet.java:167)
    at com.bea.portal.appflow.servlets.internal.PortalWebflowServlet.doGet(P
    ortalWebflowServlet.java:172)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:262)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:198)
    at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppSe
    rvletContext.java:2637)
    at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestIm
    pl.java:2359)
    at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
    at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
    >
    Not Logged In..
    Not Logged In..
    Validando session para tramite maquila (namespace):maquila3
    No existe informacion del cliente en la session para realizar tramite
    Not Logged In..
    Logged In...as secofi2
    Login - No existe informacion de session ...obteniendo perfil del usuario
    Login - Creando objeto en session ... (InteresadoValue - TipoUsuario - Rol)
    Logged In...as secofi2
    Validando session para tramite maquila (namespace):maquila3
    <Jan 22, 2003 4:37:10 PM CST> <Error> <HTTP> <[WebAppServletContext(17480164,cli
    entes,/clientes)] Root cause of ServletException
    java.lang.NullPointerException
    at jsp_servlet._framework._maquila.__generales._jspService(__generales.j
    ava:307)
    at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:262)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:321)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:198)
    at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispat
    cherImpl.java:250)
    at com.bea.p13n.appflow.webflow.servlets.internal.WebflowServlet.doGet(W
    ebflowServlet.java:167)
    at com.bea.portal.appflow.servlets.internal.PortalWebflowServlet.doGet(P
    ortalWebflowServlet.java:172)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:262)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:198)
    at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppSe
    rvletContext.java:2637)
    at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestIm
    pl.java:2359)
    at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
    at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
    >
    Can you help me?
    regards

    What is happening at __generales.java:307 ?
    Look through the domain applications\.wlnotdelete directories and find
    the file to find out what is causing the NullPointerException.
    Do you have a support account with Portal Support?
    -- Jim
    Miriam wrote:
    Hello...
    My name is Miriam Serrano I am working with BEA WebLogic Portal 4.0. My application
    is clientes, but I have a error with a webflow maquila
    Not Logged In..
    Logged In...as secofi2
    Login - No existe informacion de session ...obteniendo perfil del usuario
    Login - Creando objeto en session ... (InteresadoValue - TipoUsuario - Rol)
    Logged In...as secofi2
    Validando session para tramite maquila (namespace):maquila3
    <Jan 22, 2003 4:09:54 PM CST> <Error> <HTTP> <[WebAppServletContext(30282805,cli
    entes,/clientes)] Root cause of ServletException
    java.lang.NullPointerException:
    at jsp_servlet._framework._maquila.__generales._jspService(__generales.j
    ava:307)
    at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:262)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:198)
    at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispat
    cherImpl.java:250)
    at com.bea.p13n.appflow.webflow.servlets.internal.WebflowServlet.doGet(W
    ebflowServlet.java:167)
    at com.bea.portal.appflow.servlets.internal.PortalWebflowServlet.doGet(P
    ortalWebflowServlet.java:172)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:262)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:198)
    at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppSe
    rvletContext.java:2637)
    at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestIm
    pl.java:2359)
    at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
    at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
    Not Logged In..
    Not Logged In..
    Validando session para tramite maquila (namespace):maquila3
    No existe informacion del cliente en la session para realizar tramite
    Not Logged In..
    Logged In...as secofi2
    Login - No existe informacion de session ...obteniendo perfil del usuario
    Login - Creando objeto en session ... (InteresadoValue - TipoUsuario - Rol)
    Logged In...as secofi2
    Validando session para tramite maquila (namespace):maquila3
    <Jan 22, 2003 4:37:10 PM CST> <Error> <HTTP> <[WebAppServletContext(17480164,cli
    entes,/clientes)] Root cause of ServletException
    java.lang.NullPointerException
    at jsp_servlet._framework._maquila.__generales._jspService(__generales.j
    ava:307)
    at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:262)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:321)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:198)
    at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispat
    cherImpl.java:250)
    at com.bea.p13n.appflow.webflow.servlets.internal.WebflowServlet.doGet(W
    ebflowServlet.java:167)
    at com.bea.portal.appflow.servlets.internal.PortalWebflowServlet.doGet(P
    ortalWebflowServlet.java:172)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:262)
    at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
    pl.java:198)
    at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppSe
    rvletContext.java:2637)
    at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestIm
    pl.java:2359)
    at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
    at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
    Can you help me?
    regards

  • Sortlist - round robin - netmask ordering confusion

    I went through a crisis not long after splitting my Win2003 AD network into two VLANs, crisis documented at http://discussions.apple.com/thread.jspa?threadID=2361165
    In a nutshell, Windows DNS uses netmask ordering to resolve the "best" IP address to client queries based on their IP address. If a given host (on LAN) has more than one IP address on different VLAN/subnets, a query to a DNS server should give both IP answers, though only the one on the same subnet as the client is often accessible to that client. Thus, netmask ordering adds some intelligence to that process, overriding round-robin, and it works pretty well.
    Enter OS X Server using BIND, and set up a secondary zone to a Windows primary, and that all goes out the window. It seems OS X Server uses Round Robin by default. Though BIND is supposed to have similar functionality to Windows server's netmask ordering in a function called "sortlist," I can't figure out how to use that in OS X Server.
    Anyone ever mess with that?

    Camelot wrote:
    I'm not entirely sure I understand what you're asking. There is no concept in DNS of subnets - a host record maps to a network address (and vice versa), and subnets don't come into play.
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    My nutshell approach was not clear, but you got the gist. But there is a concept of subnets implemented in Window server. I split our school network into two VLANs for security (keep students from even seeing admin servers) but needed to keep domain in Active Directory and our Windows servers. Thus, the domain controllers are multi-homed. School admin subnet is 172.16/16, student subnet is 172.20/16. Without netmask ordering or round robin enabled, Mac clients requesting internal DNS resolution would always get the 172.16.x.x address of the domain controllers, so they could not authenticate to the domain (the AD plugin apparently can only use the first IP returned in a query, it won't try others if unsuccessful). Netmask ordering enabled the DNS server to look at the IP of the DNS client and reply to queries with the IP which is in the client subnet first, then additional IPs, if any. The next bump I hit was that netmask ordering assumes a Class C subnet, not very well-documented, but a simple command fixed that, and it's worked excellent ever since-- until I tried designating a Mac server as a secondary and set some Mac clients to point to the Mac server for DNS resolution. They then get round-robin replies, so the ADplugin, which must make several DNS queries, gets confused. Research led me to sortlist, but whether it's that or "views" as you suggest, it's probably not something I want to jump into. I am going to give up on my Magic Triangle dreams and convert student and teachers to Open Directory over the summer, just create a new domain.
    P.S. technically, MS discourages having DCs multi-homed, but not having anything layer 3 to route between my new VLANs, it was my only option. In addition, the administrative file server I needed to keep away from student hacking is also the main Domain Controller (PDC emulator master), so adding routes to make the DC work across subnets would have defeated the security purpose. It's a smaller private school, limited resources. Thx.

  • REgarding succesive orders on a bea weblogic workshop

    hello
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    hello
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  • Round-robin Load balancing doesn't work after one instance reboot

    Hi,
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              How to prevent this and make weblogic to distribute the load even after the server restart? This is a production problem and I highly appreciate your responses.
              Thanks,
              Prasad Dantuluri

    it worked when I removed the value entered in the "Unicast Broadcast Channel" and restarted the cluster. Don't know what is supposed to go in that field but hey.

  • Page naviagation doesn't work after deploy ADF application to Weblogic

    After deploy my ADF application (ear) to Weblogic Server, the page navigation doesn't work. When running the ear on weblogic, I got following warnings:
    <2010-11-5 下午05时06分01秒 CST> <Warning> <J2EE> <BEA-160195> <The application version lifecycle event listener oracle.security.jps.wls.listeners.JpsAppVersionLifecycleListener is ignored because the application HwtOrder is not versioned.>
    <2010-11-5 下午05时06分38秒 CST> <Warning> <netuix> <BEA-423420> <Redirect is executed in begin or refresh action. Redirect url is /console/console.portal?_nfpb=true&_pageLabel=AppApplicationOverviewPage&AppApplicationOverviewPortlethandle=com.bea.console.handles.AppDeploymentHandle%28%22com.bea%3AName%3DHwtOrder%2CType%3DAppDeployment%22%29.>
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    I can run the application correctly in jdeveloper 11g environment. I think there is something wrong with deployment. Can anyone help me?

    When you target url with .jspx, you are running the page itself, not in the task flow context, so navigation doesn't work.
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  • Parsing in Weblogic/jsp doesn't work; application-mode (command-line) works

    Hello-
    Parsing my XML file in Weblogic/jsp doesn't work, whereas it works
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    Here are the parameters:
    server1:
    weblogic 6.0
    win2k server
    jre1.3
    my personal machine:
    ***no weblogic***
    win2k server
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    my file and doing a root.toString() results in the following: [dmui: null]
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    (even though i'm running it on two different machines, i'm positive its the
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    So, I think its probably because I'm using a different parser, as
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    import org.w3c.dom.*;
    import org.w3c.dom.Document;
    import javax.xml.parsers.*;
    import javax.xml.parsers.DocumentBuilderFactory;
    import javax.xml.parsers.DocumentBuilder;
    import org.xml.sax.SAXException;
    import org.xml.sax.SAXParseException;
    DocumentBuilderFactory docBuilderFactory =
    DocumentBuilderFactory.newInstance();
    DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
    mDocument = docBuilder.parse (inFile);
    myRoot.toString()
    -END
    Doing a System.getProperty("javax.xml.parsers.DocumentBuilderFactory")
    results in:
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    my machine (application-mode):
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    Am I even close?
    Any help would be appreciated..
    Thanks, Clint
    "[email protected]" <[email protected]> wrote in message
    news:[email protected]...
    No problem, glad you got it worked out :)
    ~Ryan U.
    Jennifer wrote in message <[email protected]>...
    I completely missed setting the property(:-o), foolish mistake. That wasit. Thanks.
    "j.upton" <[email protected]> wrote:
    Jennifer,
    Personally I would get rid of import com.sun.xml.parser.* and use xerces
    which comes with WLS 6.0 now, unless like I said earlier you have a need
    to
    use the sun parser :) Try something like this with your code --I've put
    things to watch for as comments in the code.
    import javax.xml.parsers.*;
    import org.xml.sax.SAXException;
    import org.w3c.dom.*;
    import java.io.FileInputStream;
    public class BasicDOM {
    public BasicDOM (String xmlFile) {
    try{
    FileInputStream inStream;
    Document document;
    /*You must specify a parser for jaxp. You can in a simple view
    think
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    using this in the context of a servlet or JSP and have set an XML
    registry
    with the console this happens automatically. You can also invoke it in
    the
    context of an application on the command line using the -D switch. */
    System.setProperty("javax.xml.parsers.DocumentBuilderFactory",
    >>>
    "weblogic.apache.xerces.jaxp.DocumentBuilderFactoryImpl");
    // create a document factory
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    // specify validating or non-validating parser
    dbf.setValidating(true);
    // obtain a factory
    DocumentBuilder db = dbf.newDocumentBuilder();
    // create a document from the factory
    inStream = new FileInputStream(xmlFile);
    document = db.parse(inStream);
    }//try
    catch (Exception e)
    System.out.println("Unexpected exception reading document!"
    +e);
    System.exit (0);
    }//catch
    }//BasicDom
    // Main Method
    public static void main (String[] args) {
    if (args.length < 1)
    System.exit(1); file://or you can be more verbose
    new BasicDOM(args[0]);
    }//class
    =============================================
    That will give you a basic DOM you can manipulate and parse it fromthere.
    BTW this code
    compiled and ran on WLS 6.0 under Windows 2000.
    Let me know if this helped or you still are having trouble.
    ~Ryan U.
    "Jennifer" <[email protected]> wrote in message
    news:[email protected]...
    Actually I included com.sun.xml.parser.* as one last febble attempt toget
    it working.
    And as for source code, I included the code. If I just put that oneline
    of code
    in, including the imports, it fails giving me an error listed above inthe
    subject
    line. Here is the code again:
    package examples.xml.http;
    import javax.xml.parsers.*;
    import org.xml.sax.SAXException;
    import org.xml.sax.SAXParseException;
    import org.w3c.dom.*;
    import java.util.*;
    import java.net.*;
    import org.xml.sax.*;
    import java.io.*;
    public class BasicDOM {
    static Document document;
    public BasicDOM (String xmlFile) {
    try {
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    } catch (FactoryConfigurationError e){
    System.err.println(e.getException());
    e.printStackTrace();
    // Main Method
    public static void main (String[] args) {
    BasicDOM basicDOM = new BasicDOM (args[0]);

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    Does it work in WL9.2?
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    </container-descriptor>
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    <classloader-structure>
    <module-ref>
    <!-- reminder: this webapp contains
    prefer-web-inf-classes -->
    <module-uri>webapp</module-uri>
    </module-ref>
    <classloader-structure>
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    </classloader-structure>
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  • NT service start of weblogic doesn't work (command line start works)...

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    Ven

    This is a known bug in the Windows native convenience programs.
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    works well enough to do development work. Certification (and
    support for deployment) is targeted for an upcoming service pack.
    Chuck Karish
    Tsung-Wen Tsai wrote:
    >
    Does WLS 5.1 works with jdk or jre 1.3?
    I looked at jdk and jre 1.3 directory and I can't find javai.dll file,
    although javai DO come with jdk 1.1.6.
    I got this error when starting WLS. I changed the JAVA_HOME through
    wlconfig.
    -Tsung
    =============================
    c:\weblogic>bin\wlserver
    Java dll not found. Bad value for JAVA_HOME.
    The system cannot find the path specified.
    Java dll not found. Bad value for JAVA_HOME.
    The system cannot find the path specified.
    loadIt: Java DLL not found.
    The Windows registry is misconfigured
    for the WebLogic Server
    JAVA dll not found: c:\progra~1\javasoft\jre\bin\javai.dll:
    The Windows registry is misconfigured
    for the WebLogic Server
    Can't start WebLogic Server: (Can't start Java VM) err=0x2000001--
    Chuck Karish BEA Systems
    [email protected] San Francisco, CA
    (415) 317-0182 (cell) (415) 364-4692

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