Problem in getting Home object of EJB in WebLogic 6.1

Hello,
I have deployed my stateless session bean with remote interfaces on my weblogic server but when i tried to access it from my client which is also present in the same application (ear) then it gives the following exception.
java.lang.ExceptionInInitializerError
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:42)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:30)
at java.lang.reflect.Constructor.newInstance(Constructor.java:277)
at java.lang.Class.newInstance0(Class.java:301)
at java.lang.Class.newInstance(Class.java:254)
at javax.rmi.CORBA.Util.createDelegateIfSpecified(Util.java:342)
at javax.rmi.CORBA.Util.<clinit>(Util.java:54)
at javax.rmi.PortableRemoteObject.createDelegateIfSpecified(PortableRemoteObject.java:182)
at javax.rmi.PortableRemoteObject.<clinit>(PortableRemoteObject.java:61)
at jsp_servlet.__login._jspService(__login.java:123)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:265)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:200)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:2495)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2204)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
Caused by: java.lang.RuntimeException: could not find or instantiate any UtilDelegate class
at weblogic.iiop.UtilDelegateImpl.<clinit>(UtilDelegateImpl.java:73)
... 18 more
My code is like :
UserRegistrationHome loginuser;
Context initial = new InitialContext();
Object objref = initial.lookup("ejb/SimpleUserRegistration");
loginuser =(UserRegistrationHome) PortableRemoteObject.narrow(objref,UserRegistrationHome.class);
UserRegistration userlogin = loginuser.create();
It comes at line with PortableRemoteObject.......
Will some one help me in this regard, as why this exception generally comes and in what settings....
Thanks in advance.
SAC

Can you tell me how resolve the problem?
Thanks,
Michael
[email protected]

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    ht.put("java.naming.factory.initial", args[2]);
    ht.put("java.naming.provider.url", args[3]);
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    ctx.rebind(homeName, trader);
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    [4] generate the IDL for the RMI interface,
    rmic -idl stock.StockTraderImpl
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    idlj -v -fclient -emitAll StockTraderImpl.idl
    [6] Write the client to use the IDL-defined stock trader,
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    String symList =args[1];
    StockClient client =new StockClient();
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    ORB orb =ORB.init(args, null);
    System.out.println("resolve init name service...");
    org.omg.CORBA.Object objRef
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    NamingContext naming =NamingContextHelper.narrow(objRef);
    ... define a naming component etc...
    org.omg.CORBA.Object obj =naming.resolve(...);
    System.out.println("narrow objRef: " obj.getClass() ": " +obj);
    StockTrader trader =StockTraderHelper.narrow(obj);
    [7] Compile all the classes using Java 1.2.2
    [8] start tnameserv (naming service), then the server to register the RMI
    server obj
    [9] Run the CORBA client, passing it the COSNaming service ref name (with
    which the server obj is registered)
    The CORBA client successfully finds the server obj ref in the naming
    service, the operation StockTraderHelper.narrow() fails in the segment
    below, with a class cast exception:
    org.omg.CORBA.Object obj =naming.resolve(...);
    StockTrader trader =StockTraderHelper.narrow(obj);
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    thanks in advance,
    -hari

    On the contrary... all that is being said is that we needed to provide clearer examples/documentation in the 5.1.0 release. There will be no difference between the product as found in the service pack and the product found in the 5.1.1. That is, the only substantive will be that 5.1.1 will also
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    "<=one way=>" wrote:
    With reference to your and other messages, it appears that one should not
    expect that WLS RMI-IIOP will work in a complex real-life system, at least
    not now. In other words, support for real-life CORBA clients is not an
    option in the current release of WLS.
    TIA
    "Eduardo Ceballos" <[email protected]> wrote in message
    news:[email protected]...
    We currently publish an IDL example, even though the IDL programmingmodel in Java is completely non-functional, in anticipation of the support
    needs for uses who need to use IDL to talk to the Weblogic server,
    generically. This example illustrates the simplest connectivity; it does not
    address how
    to integrate CORBA and EJB, a broad topic, fraught with peril, imo. I'llnote in passing that, to my knowledge, none of the other vendors attempt
    this topic either, a point which is telling if all the less happy to hear.
    For the record then, what is missing from our distribution wrt RMI-IIOPare a RMI-IIOP example, an EJB-IIOP example, an EJB-C++. In this you are
    correct; better examples are forth coming.
    Still, I would not call our RMI-IIOP implementation fragile. I would saythat customers have an understandably hard time accepting that the IDL
    programming model is busted; busted in the sense that there are no C++
    libraries to support the EJB model, and busted in the sense that there is
    simply no
    support in Java for an IDL interface to an EJB. Weblogic has nothing to doit being busted, although we are trying to help our customers deal with it
    in productive ways.
    For the moment, what there is is a RMI (over IIOP) programming model, aninherently Java to Java programming model, and true to that, we accept and
    dispatch IIOP request into RMI server objects. The way I look at it is this:
    it's just a protocol, like HTTP, or JRMP; it's not IDL and it has
    practically nothing to do with CORBA.
    ST wrote:
    Eduardo,
    Can you give us more details about the comment below:
    I fear that as soon as the call to narrow succeeds, the remainingapplication will fail to work correctly because it is too difficult ot
    use an idl client in java to work.It seems to me that Weblogic's RMI-IIOP is a very fragile
    implementation. We
    don't need a "HelloWorld" example, we need a concrete serious example(fully
    tested and seriously documented) that works so that we can get a betteridea
    on how to integrate CORBA and EJB.
    Thanks,
    Said
    "Eduardo Ceballos" <[email protected]> wrote in message
    news:[email protected]...
    Please post request to the news group...
    As I said, you must separate the idl related classes (class files and
    java
    files) from the rmi classes... in the rmic step, you must set a newtarget
    (as you did), emit the java files into that directory (it's not clearyou
    did this), then remove all the rmi class files from the class path... ifyou
    need to compile more classes at that point, copy the java files to theidl
    directly is you must, but you can not share the types in any way.
    I fear that as soon as the call to narrow succeeds, the remainingapplication will fail to work correctly because it is too difficult otuse
    an idl client in java to work.
    Harindra Rajapakshe wrote:
    Hi Eduardo,
    Thanks for the help. That is the way I compiled my CORBA client, by
    separating the IDL-generated stubs from the RMI ones, but still I
    get a
    CORBA.BAD_PARAM upon narrowing the client proxy to the interfacetype.
    Here's what I did;
    + Define the RMI interfaces, in this case a StockTrader interface.
    + Implement RMI interface by extendingjavax.rmi.PortableRemoteObject
    making
    it IIOP compliant
    + Implemnnt an RMI server, and compile using JDK1.2.2
    + use the RMI implementation to generate CORBA idl, using RMI-IIOPplugin
    utility rmic;
    rmic -idl -noValueMethods -always -d idl stock.StockTraderImpl
    + generate Java mappings to the IDL generated above, using RMI-IIOPplugin
    util,
    idlj -v -fclient -emitAll -tf src stocks\StockTrader.idl
    This creates source for the package stock and also
    org.omg.CORBA.*
    package, presumably IIOP type marshalling
    + compile all classes generated above using JDK1.2.2
    + Implement client (CORBA) using the classes generated above, NOTthe
    RMI
    proxies.
    + start RMI server, with stockTrader server obj
    + start tnameserv
    + start CORBA client
    Then the client errors when trying to narrow the obj ref from the
    naming
    service, into the CORBA IDL defined interface using,
    org.omg.CORBA.Object obj =naming.resolve(nn);
    StockTrader trader =StockTraderHelper.narrow(obj); // THIS
    ERRORS..!!!
    throwing a CORBA.BAD_PARAM exception.
    any ideas..?
    Thanks in advance,
    -hari
    ----- Original Message -----
    From: Eduardo Ceballos <[email protected]>
    Newsgroups: weblogic.developer.interest.rmi-iiop
    To: Hari Rajapakshe <[email protected]>
    Sent: Wednesday, July 26, 2000 4:38 AM
    Subject: Re: problem using CORBA clients with RMI/EJBservers..!!!???
    Please see the post on june 26, re Errors compiling... somewherein
    there,
    I suspect, you are referring to the rmi class file when you are
    obliged
    to
    completely segregate these from the idl class files.
    Hari Rajapakshe wrote:
    Hi,
    I have a question on using EJB / or RMI servers with CORBA
    clients
    using
    RMI-IIOP transport, which in theory should work, but in practice
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    few
    glitches.
    Basically, I have implemented a very simple server,
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    lookup
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    1)
    and a
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    But the problem arises when I tried using the RMI server (via
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    the
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    obtained
    from
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    it
    ends
    up
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    This is what I did to achieve the above results:
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    java.rmi.Remote)
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    public String lookup( String symbol) throws RMIException;
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    register
    the
    stock
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    StockTraderImpl trader =new StockTraderImpl();
    System.out.println("binding obj <" homeName ">...");
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    rmic -idl stock.StockTraderImpl
    [5] Generate IDL stubs for the CORBA client,
    idlj -v -fclient -emitAll StockTraderImpl.idl
    [6] Write the client to use the IDL-defined stock trader,
    String serverName =args[0];
    String symList =args[1];
    StockClient client =new StockClient();
    System.out.println("init orb...");
    ORB orb =ORB.init(args, null);
    System.out.println("resolve init name service...");
    org.omg.CORBA.Object objRef
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    org.omg.CORBA.Object obj =naming.resolve(...);
    System.out.println("narrow objRef: " obj.getClass() ":"
    +obj);
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    [7] Compile all the classes using Java 1.2.2
    [8] start tnameserv (naming service), then the server to
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    [9] Run the CORBA client, passing it the COSNaming service ref
    name
    (with
    which the server obj is registered)
    The CORBA client successfully finds the server obj ref in the
    naming
    service, the operation StockTraderHelper.narrow() fails in thesegment
    below, with a class cast exception:
    org.omg.CORBA.Object obj =naming.resolve(...);
    StockTrader trader =StockTraderHelper.narrow(obj);
    The <obj> returned by naming service turns out to be of the
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    class com.sun.rmi.iiop.CDRInputStream$1
    This is of the same type when stock trader object is registeredin a
    CORBA
    server (as opposed to an RMI server), but works correctly with
    no
    casting
    excpetions..
    Any ideas / hints very welcome.
    thanks in advance,
    -hari

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