Event Listener dispatcher giving an ClassCast Exception in C++ 3.6.1

Question

Hi,
I have attached a Event listener to underlying NamedCache and when I update the cache entry I didn't get any alerts. But When I checked the
coherence log I found following Exception available. But I'm not doing any sort of Casting as mentioned below.
2012-01-17 11:12:55.793/0.320 Oracle Coherence for C++ RTC 3.6.1.0 <Info> (thread=main): Connected Socket to 169.52.37.237/169.52.37.237:9099
2012-01-17 11:13:04.859/9.386 Oracle Coherence for C++ RTC 3.6.1.0 <Error> (thread=ExtendTcpCacheService:coherence::component::util::TcpInitiator:coherence::component::util::Service::EventDispatcher): An exception occurred while dispatching the following event:
coherence::component::util::RunnableCacheEvent: coherence::util::MapListenerSupport::FilterEvent{coherence::component::net::extend::RemoteNamedCache::BinaryCache[source=coherence::component::net::extend::RemoteNamedCache::BinaryCache@0x69f090c4] updated: key=Binary(length=19), old value=Binary(length=713), new value=Binary(length=713), filters=[NULL]}
2012-01-17 11:13:04.860/9.387 Oracle Coherence for C++ RTC 3.6.1.0 <Error> (thread=ExtendTcpCacheService:coherence::component::util::TcpInitiator:coherence::component::util::Service::EventDispatcher): The following exception was caught by the event dispatcher:
2012-01-17 11:13:04.860/9.387 Oracle Coherence for C++ RTC 3.6.1.0 <Error> (thread=ExtendTcpCacheService:coherence::component::util::TcpInitiator:coherence::component::util::Service::EventDispatcher): NULL
coherence::lang::ClassCastException: attempt to cast from a "gce::coherence::CoherenceEventHandler" to a "coherence::util::MapListener" at void coherence::lang::coh_throw_class_cast(const std::type_info&, const std::type_info&)(ClassCastException.cpp:27)
at coherence::lang::coh_throw_class_cast(std::type_info const&, std::type_info const&)
at coherence::lang::TypedHandle<coherence::util::MapListener> coherence::lang::cast<coherence::lang::TypedHandle<coherence::util::MapListener>, coherence::lang::Object>(coherence::lang::TypedHandle<coherence::lang::Object> const&, bool)
at coherence::lang::TypedHandle<coherence::util::MapListener> coherence::lang::cast<coherence::lang::TypedHandle<coherence::util::MapListener>, coherence::lang::Object>(coherence::lang::TypedHolder<coherence::lang::Object> const&, bool)
at coherence::lang::TypedHandle<coherence::util::MapListener> coherence::lang::cast<coherence::lang::TypedHandle<coherence::util::MapListener>, coherence::lang::Object>(coherence::lang::MemberHolder<coherence::lang::Object> const&, bool)
When I wrote a sample application It works without any problem. Only difference of above exception coming program is this c++ library is loaded true JNI and relevant event listener is added during a JNI method call. Please explain me why this exception is coming. I have attached the relevant code as well.
CoherenceEventListener.hpp
* File: CoherenceEventHandler.hpp
* Author: srathna1
* Created on 05 January 2012, 10:15
#ifndef COHERENCEEVENTHANDLER_HPP
#define     COHERENCEEVENTHANDLER_HPP
#include "coherence/util/MapEvent.hpp"
#include "coherence/util/MapListener.hpp"
#include <iostream>
//#include <map>
#include "coherence/lang.ns"
#include "mihelper.hpp"
#include "MiCoherence.hpp"
#include <string>
#include "MICoherenceDataObject.hpp"
using coherence::util::MapEvent;
using coherence::util::MapListener;
using namespace coherence::lang;
* A MapListener implementation that prints each event as it receives
* them.
namespace gce {
namespace coherence {
class CoherenceEventHandler
: public class_spec<CoherenceEventHandler,
extends<Object>,
implements<MapListener> > {
friend class factory<CoherenceEventHandler>;
public:
CoherenceEventHandler(CMiCoherence * miCoh) : mi(miCoh), msgSeqNo(1) {
virtual void entryInserted(MapEvent::View vEvent) {
Object::View vKey = vEvent->getKey();
String::View key = cast<String::View > (vKey);
Object::View vValue = vEvent->getNewValue();
char topic[100];
strcpy(topic, key->getCString());
Managed<gce::coherence::MICoherenceDataObject>::View pos = cast<Managed<gce::coherence::MICoherenceDataObject>::View > (vValue);
std::cout << key << " = " << pos << std::endl;
virtual void entryUpdated(MapEvent::View vEvent) {
Object::View vKey = vEvent->getKey();
String::View key = cast<String::View > (vKey);
Object::View vValue = vEvent->getNewValue();
char topic[100];
strcpy(topic, key->getCString());
Managed<gce::coherence::MICoherenceDataObject>::View pos = cast<Managed<gce::coherence::MICoherenceDataObject>::View > (vValue);
std::cout << key << " = " << pos << std::endl;
gce::coherence::MICoherenceDataObject msg = *pos;
virtual void entryDeleted(MapEvent::View vEvent) {
private:
CMiCoherence * mi;
int msgSeqNo;
#endif     /* COHERENCEEVENTHANDLER_HPP */
Event Registration code
NamedCache::Handle miCoherenceCache = NULL;
try {
String::View cacheName = szConnect;
miCoherenceCache = CacheFactory::getCache(cacheName);
} catch (const std::exception& e) {
LOGERR("initializing coherence middleware cache error: %s", e.what());
return MI_ERR_BADSTATE;
nConnectState = miCoherenceCache->getCacheService()->isRunning() == true ? 1 : 0;
miCoherenceCache->addFilterListener(gce::coherence::CoherenceEventHandler::create(this));
Please give me a clue why Cohrence Internal Event Dispatcher giving exception.....
Thanks and regards,
Sura

Answer 1

Hi,
Even when I try to to test the MemberListener while closing the Coherene Java Cache Cluster I can see following Exception. Something similar to EventListener.
2012-01-18 20:06:18.868/44.346 Oracle Coherence for C++ RTC 3.6.1.0 <Error> (thread=ExtendTcpCacheService:coherence::component::util::TcpInitiator:coherence::component::util::Service::EventDispatcher): The following exception was caught by the event dispatcher:
2012-01-18 20:06:18.868/44.346 Oracle Coherence for C++ RTC 3.6.1.0 <Error> (thread=ExtendTcpCacheService:coherence::component::util::TcpInitiator:coherence::component::util::Service::EventDispatcher): NULL
coherence::lang::ClassCastException: attempt to cast from a "gce::coherence::CoherenceMemberListener" to a "coherence::net::MemberListener"
at void coherence::lang::coh_throw_class_cast(const std::type_info&, const std::type_info&)(ClassCastException.cpp:27)
at coherence::lang::coh_throw_class_cast(std::type_info const&, std::type_info const&)
at coherence::lang::TypedHandle<coherence::net::MemberListener> coherence::lang::cast<coherence::lang::TypedHandle<coherence::net::MemberListener>, coherence::lang::Object>(coherence::lang::TypedHandle<coherence::lang::Object> const&, bool)
at coherence::lang::TypedHandle<coherence::net::MemberListener> coherence::lang::cast<coherence::lang::TypedHandle<coherence::net::MemberListener>, coherence::lang::Object>(coherence::lang::TypedHolder<coherence::lang::Object> const&, bool)
at coherence::lang::TypedHandle<coherence::net::MemberListener> coherence::lang::cast<coherence::lang::TypedHandle<coherence::net::MemberListener>, coherence::lang::Object>(coherence::lang::MemberHolder<coherence::lang::Object> const&, bool)
at coherence::net::MemberEvent::dispatch(coherence::lang::TypedHandle<coherence::util::Listeners const>) const
at coherence::component::util::ListenerCallback::translateMemberEvent(coherence::lang::TypedHandle<coherence::net::MemberEvent const>)
at coherence::component::util::ListenerCallback::memberLeaving(coherence::lang::TypedHandle<coherence::net::MemberEvent const>)
at coherence::net::MemberEvent::dispatch(coherence::lang::TypedHandle<coherence::util::Listeners const>) const
at coherence::component::net::extend::RemoteService::dispatchMemberEvent(coherence::net::MemberEvent::Id)
at coherence::component::net::extend::RemoteService::connectionError(coherence::lang::TypedHandle<coherence::net::messaging::ConnectionEvent const>)
at coherence::component::net::extend::RemoteCacheService::connectionError(coherence::lang::TypedHandle<coherence::net::messaging::ConnectionEvent const>)
at coherence::net::messaging::ConnectionEvent::dispatch(coherence::lang::TypedHandle<coherence::util::Listeners const>) const
at coherence::component::util::Peer::DispatchEvent::run()
at coherence::component::util::Service::EventDispatcher::onNotify()
at coherence::component::util::Daemon::run()
at coherence::lang::Thread::run()
on thread "ExtendTcpCacheService:coherence::component::util::TcpInitiator:coherence::component::util::Service::EventDispatcher"
Seems to be like loading with JNI will giving some exceptions.
Please help me on this...
Thanks and regards,
Sura