Hi,

I tried to run the Publish-Subscribe Channel EIB sample[1] and got
following message in management console once I add Event Sink URL and then
click on the update button. I followed the steps up to Third bullet point
of step 3 in Environment setup section of the sample document.

Subscribed to http://localhost:9000/services/SimpleStockQuoteService using
PublisherSubsciber Successfully org.wso2.carbon.registry.core.ResourceImpl
cannot be cast to org.wso2.carbon.registry.core.Collection

In terminal, I got following stacktrace.

[2015-05-28 14:48:08,281] ERROR - RPCMessageReceiver
org.wso2.carbon.registry.core.ResourceImpl cannot be cast to
org.wso2.carbon.registry.core.Collection
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at
org.apache.axis2.rpc.receivers.RPCUtil.invokeServiceClass(RPCUtil.java:212)
at
org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic(RPCMessageReceiver.java:117)
at
org.apache.axis2.receivers.AbstractInOutMessageReceiver.invokeBusinessLogic(AbstractInOutMessageReceiver.java:40)
at
org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:110)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
at
org.apache.axis2.transport.local.LocalTransportReceiver.processMessage(LocalTransportReceiver.java:169)
at
org.apache.axis2.transport.local.LocalTransportReceiver.processMessage(LocalTransportReceiver.java:82)
at
org.wso2.carbon.core.transports.local.CarbonLocalTransportSender.finalizeSendWithToAddress(CarbonLocalTransportSender.java:45)
at
org.apache.axis2.transport.local.LocalTransportSender.invoke(LocalTransportSender.java:77)
at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:442)
at
org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:430)
at
org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:225)
at org.apache.axis2.client.OperationClient.execute(OperationClient.java:149)
at
org.wso2.carbon.event.stub.internal.TopicManagerAdminServiceStub.getWsSubscriptionsForTopic(TopicManagerAdminServiceStub.java:2101)
at
org.apache.jsp.topics.add_005fsubscription_005fajaxprocessor_jsp._jspService(add_005fsubscription_005fajaxprocessor_jsp.java:187)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.wso2.carbon.ui.JspServlet.service(JspServlet.java:155)
at org.wso2.carbon.ui.TilesJspServlet.service(TilesJspServlet.java:80)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at
org.eclipse.equinox.http.helper.ContextPathServletAdaptor.service(ContextPathServletAdaptor.java:37)
at
org.eclipse.equinox.http.servlet.internal.ServletRegistration.service(ServletRegistration.java:61)
at
org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:128)
at
org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:68)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at
org.wso2.carbon.tomcat.ext.servlet.DelegationServlet.service(DelegationServlet.java:68)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at
org.wso2.carbon.tomcat.ext.filter.CharacterSetFilter.doFilter(CharacterSetFilter.java:61)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at
org.wso2.carbon.tomcat.ext.valves.CompositeValve.continueInvocation(CompositeValve.java:99)
at
org.wso2.carbon.tomcat.ext.valves.TomcatValveContainer.invokeValves(TomcatValveContainer.java:49)
at
org.wso2.carbon.tomcat.ext.valves.CompositeValve.invoke(CompositeValve.java:62)
at
org.wso2.carbon.tomcat.ext.valves.CarbonStuckThreadDetectionValve.invoke(CarbonStuckThreadDetectionValve.java:159)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at
org.wso2.carbon.tomcat.ext.valves.CarbonContextCreatorValve.invoke(CarbonContextCreatorValve.java:57)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
at
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1074)
at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1739)
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1698)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassCastException:
org.wso2.carbon.registry.core.ResourceImpl cannot be cast to
org.wso2.carbon.registry.core.Collection
at
org.wso2.carbon.event.core.internal.topic.registry.RegistryTopicManager.addSubscriptions(RegistryTopicManager.java:395)
at
org.wso2.carbon.event.core.internal.topic.registry.RegistryTopicManager.getSubscriptions(RegistryTopicManager.java:310)
at
org.wso2.carbon.event.admin.internal.TopicManagerAdminService.getWsSubscriptionsForTopic(TopicManagerAdminService.java:161)
... 63 more


I repeated the same on ESB-4.8.1 and it didn't generate this exception and
can run sample without any issue.

[1]
https://docs.wso2.com/display/IntegrationPatterns/Publish-Subscribe+Channel

Thanks,
/charithag

-- 
*Charitha Goonetilleke*
Software Engineer
WSO2 Inc.; http://wso2.com
lean.enterprise.middleware

mobile: +94 77 751 3669 <%2B94777513669>
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