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Ice::NoObjectFactoryException

Hello,

I my slice definition I've created a sequence, that contains Test objects. In this class there is a function, which returns the 'TestSequence':

class Test;
sequence<Test> TestSequence;
class Test
{
TestSequence op();
};

The client invokes the function as follows:

TestSequence test = new TestSequence;
test = testProxy->op();


The server executes the function call:

TestSequence TestI::op()
{
TestSequence testSeq = new TestSequence;
...
TestPtr obj = new TestI();
testSeq.push_back(obj);
...
return testSeq;
}

If I run my application I get the following error message:

Test.cxx: Ice::NoObjectFactoryException:
protocol error: no suitable object factory found for '::Test'


I don't know where the problem lies. Can you help me out?

Thanks

Comments

  • marcmarc FloridaAdministrators, ZeroC Staff Marc LaukienOrganization: ZeroC, Inc.Project: The Internet Communications Engine ZeroC Staff
    If you want to transfer "Test" objects by-value, then you must install an object factory for "TestI" in the client, so that Ice knows how to instantiate new Test objects when unmarshaling.

    For an example, have a look at demo/Ice/value. In the file Client.cpp, you'll find the following code:

    Ice::ObjectFactoryPtr factory = new ObjectFactory;
    communicator->addObjectFactory(factory, "::Printer");

    You can take this as an example for how to install object factories for by-value transfer of objects.
  • Thanks for your fast reply.

    Another question, is there any possibility to transfer objects by reference? If yes, how can I implement it in my testcase?
  • marcmarc FloridaAdministrators, ZeroC Staff Marc LaukienOrganization: ZeroC, Inc.Project: The Internet Communications Engine ZeroC Staff
    Sure, that's called "by proxy". (We try to avoid the term "reference", because it is so ambiguous.)

    Sending a proxy for an object instead of the object by value is much more common. Please see the Ice documentation for more information, it has lots of examples for by-proxy transfer.
  • After I had a look at the demo programs, I have changed my example to 'by proxy' transfer. In my client I invoke a function as remote call. In the server the function is executed and send back a proxy [TestSequence - Object] to the client.

    Slice:
    ****
    class Test;
    sequence<Test> TestSequence;
    class Test
    {
    void op(out TestSequence testSeq);
    };


    Client:
    *****
    Ice::ObjectFactoryPtr factory = new ObjectFactory;
    communicator->addObjectFactory(factory, "::Test");
    TestSequence *testObject = new TestSequence;
    proxy->op(*testObject);

    Server:
    ******
    void TestI::op(TestSequence &testSeq, const Ice::Current&)
    {
    ...
    TestPtr obj = new TestI();
    testSeq.push_back(obj);
    ...
    }

    While executing my application I get the following message:
    server: error: unknown exception in 'Ice.ThreadPool.Server'

    I think it's only a small problem, but I can't see it.
  • marcmarc FloridaAdministrators, ZeroC Staff Marc LaukienOrganization: ZeroC, Inc.Project: The Internet Communications Engine ZeroC Staff
    This is still by-value transfer. If you want by-proxy transfer, you would have to change:

    sequence<Test> TestSequence;

    To:

    sequence<Test*> TestSequence;

    As for the exception, I'm afraid I don't know where this is coming from. Do you have a stack trace?

    Also note that you don't need an object factory for by-proxy transfer.
  • Thanks, now it works fine.

    I followed your hint and changed some minor problems.
    I've read it in the documentation, that I don't need an object factory, but it seems I forgot it ;-).
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