Hi All,

I have experienced the below error when starting a worker in a cluster
setup. This worker was working fine earlier, and got this issue for all the
proxies when starting it today. When restarting the worker, the issue
didn't recreate. All other nodes started without a problem.


Cluster is a SVN based setup which use MSSQL DB with SQLJDBC driver, runs
on java 6.

Please look into this to check whether it is harmful or not.



[2013-11-20 10:24:34,499]  INFO - Axis2SynapseController Initializing
Synapse at : Wed Nov 20 10:24:34 IST 2013
[2013-11-20 10:24:34,554]  INFO - CarbonSynapseController Loading the
mediation configuration from the file system
[2013-11-20 10:24:34,558]  INFO - MultiXMLConfigurationBuilder Building
synapse configuration from the synapse artifact repository at :
././repository/deployment/server/synapse-configs/default
[2013-11-20 10:24:34,559]  INFO - XMLConfigurationBuilder Generating the
Synapse configuration model by parsing the XML configuration
[2013-11-20 10:24:35,080] ERROR - MediatorFactoryFinder Unknown mediator
referenced by configuration element : {
http://ws.apache.org/ns/synapse}twitter
[2013-11-20 10:24:35,081]  WARN - SynapseXMLConfigurationFactory Proxy
Service configuration: twitter_getFollowers cannot be built - Continue in
fail-safe mode
org.apache.synapse.SynapseException: Unknown mediator referenced by
configuration element : {http://ws.apache.org/ns/synapse}twitter
    at
org.apache.synapse.config.xml.MediatorFactoryFinder.getMediator(MediatorFactoryFinder.java:218)
    at
org.apache.synapse.config.xml.AbstractListMediatorFactory.addChildren(AbstractListMediatorFactory.java:41)
    at
org.apache.synapse.config.xml.SequenceMediatorFactory.createAnonymousSequence(SequenceMediatorFactory.java:70)
    at
org.apache.synapse.config.xml.ProxyServiceFactory.createProxy(ProxyServiceFactory.java:178)
    at
org.apache.synapse.config.xml.SynapseXMLConfigurationFactory.defineProxy(SynapseXMLConfigurationFactory.java:142)
    at
org.apache.synapse.config.xml.MultiXMLConfigurationBuilder.createProxyServices(MultiXMLConfigurationBuilder.java:239)
    at
org.apache.synapse.config.xml.MultiXMLConfigurationBuilder.getConfiguration(MultiXMLConfigurationBuilder.java:132)
    at
org.apache.synapse.config.SynapseConfigurationBuilder.getConfiguration(SynapseConfigurationBuilder.java:100)
    at
org.apache.synapse.Axis2SynapseController.createSynapseConfiguration(Axis2SynapseController.java:479)
    at
org.wso2.carbon.mediation.initializer.CarbonSynapseController.createSynapseConfiguration(CarbonSynapseController.java:169)
    at org.apache.synapse.ServerManager.start(ServerManager.java:177)
    at
org.wso2.carbon.mediation.initializer.ServiceBusInitializer.initESB(ServiceBusInitializer.java:424)
    at
org.wso2.carbon.mediation.initializer.ServiceBusInitializer.activate(ServiceBusInitializer.java:182)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponent.activate(ServiceComponent.java:260)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponentProp.activate(ServiceComponentProp.java:146)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponentProp.build(ServiceComponentProp.java:347)
    at
org.eclipse.equinox.internal.ds.InstanceProcess.buildComponent(InstanceProcess.java:620)
    at
org.eclipse.equinox.internal.ds.InstanceProcess.buildComponents(InstanceProcess.java:197)
    at
org.eclipse.equinox.internal.ds.Resolver.getEligible(Resolver.java:343)
    at
org.eclipse.equinox.internal.ds.SCRManager.serviceChanged(SCRManager.java:222)
    at
org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:107)
    at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.dispatchEvent(BundleContextImpl.java:861)
    at
org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
    at
org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEventPrivileged(ServiceRegistry.java:819)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEvent(ServiceRegistry.java:771)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.register(ServiceRegistrationImpl.java:130)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.registerService(ServiceRegistry.java:214)
    at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService(BundleContextImpl.java:433)
    at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService(BundleContextImpl.java:451)
    at
org.wso2.carbon.event.core.internal.builder.EventBrokerHandler.startEventBroker(EventBrokerHandler.java:58)
    at
org.wso2.carbon.event.core.internal.builder.EventBrokerBuilderDS.activate(EventBrokerBuilderDS.java:72)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponent.activate(ServiceComponent.java:260)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponentProp.activate(ServiceComponentProp.java:146)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponentProp.build(ServiceComponentProp.java:347)
    at
org.eclipse.equinox.internal.ds.InstanceProcess.buildComponent(InstanceProcess.java:620)
    at
org.eclipse.equinox.internal.ds.InstanceProcess.buildComponents(InstanceProcess.java:197)
    at
org.eclipse.equinox.internal.ds.Resolver.getEligible(Resolver.java:343)
    at
org.eclipse.equinox.internal.ds.SCRManager.serviceChanged(SCRManager.java:222)
    at
org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:107)
    at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.dispatchEvent(BundleContextImpl.java:861)
    at
org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
    at
org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEventPrivileged(ServiceRegistry.java:819)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEvent(ServiceRegistry.java:771)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.register(ServiceRegistrationImpl.java:130)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.registerService(ServiceRegistry.java:214)
    at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService(BundleContextImpl.java:433)
    at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService(BundleContextImpl.java:451)
    at
org.wso2.carbon.core.init.CarbonServerManager.initializeCarbon(CarbonServerManager.java:517)
    at
org.wso2.carbon.core.init.CarbonServerManager.start(CarbonServerManager.java:219)
    at
org.wso2.carbon.core.internal.CarbonCoreServiceComponent.activate(CarbonCoreServiceComponent.java:77)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponent.activate(ServiceComponent.java:260)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponentProp.activate(ServiceComponentProp.java:146)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponentProp.build(ServiceComponentProp.java:347)
    at
org.eclipse.equinox.internal.ds.InstanceProcess.buildComponent(InstanceProcess.java:620)
    at
org.eclipse.equinox.internal.ds.InstanceProcess.buildComponents(InstanceProcess.java:197)
    at
org.eclipse.equinox.internal.ds.Resolver.getEligible(Resolver.java:343)
    at
org.eclipse.equinox.internal.ds.SCRManager.serviceChanged(SCRManager.java:222)
    at
org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:107)
    at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.dispatchEvent(BundleContextImpl.java:861)
    at
org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
    at
org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEventPrivileged(ServiceRegistry.java:819)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEvent(ServiceRegistry.java:771)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.register(ServiceRegistrationImpl.java:130)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.registerService(ServiceRegistry.java:214)
    at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService(BundleContextImpl.java:433)
    at
org.eclipse.equinox.http.servlet.internal.Activator.registerHttpService(Activator.java:81)
    at
org.eclipse.equinox.http.servlet.internal.Activator.addProxyServlet(Activator.java:60)
    at
org.eclipse.equinox.http.servlet.internal.ProxyServlet.init(ProxyServlet.java:40)
    at
org.wso2.carbon.tomcat.ext.servlet.DelegationServlet.init(DelegationServlet.java:38)
    at
org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1267)
    at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1186)
    at
org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1081)
    at
org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5027)
    at
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5314)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at java.lang.Thread.run(Thread.java:662)
[2013-11-20 10:24:35,125] ERROR - MediatorFactoryFinder Unknown mediator
referenced by configuration element : {
http://ws.apache.org/ns/synapse}twitter
[2013-11-20 10:24:35,125]  WARN - SynapseXMLConfigurationFactory Proxy
Service configuration: twitter_getClosestTrends cannot be built - Continue
in fail-safe mode
org.apache.synapse.SynapseException: Unknown mediator referenced by
configuration element : {http://ws.apache.org/ns/synapse}twitter
    at
org.apache.synapse.config.xml.MediatorFactoryFinder.getMediator(MediatorFactoryFinder.java:218)
    at
org.apache.synapse.config.xml.AbstractListMediatorFactory.addChildren(AbstractListMediatorFactory.java:41)
    at
org.apache.synapse.config.xml.SequenceMediatorFactory.createAnonymousSequence(SequenceMediatorFactory.java:70)
    at
org.apache.synapse.config.xml.ProxyServiceFactory.createProxy(ProxyServiceFactory.java:178)
    at
org.apache.synapse.config.xml.SynapseXMLConfigurationFactory.defineProxy(SynapseXMLConfigurationFactory.java:142)
    at
org.apache.synapse.config.xml.MultiXMLConfigurationBuilder.createProxyServices(MultiXMLConfigurationBuilder.java:239)
    at
org.apache.synapse.config.xml.MultiXMLConfigurationBuilder.getConfiguration(MultiXMLConfigurationBuilder.java:132)
    at
org.apache.synapse.config.SynapseConfigurationBuilder.getConfiguration(SynapseConfigurationBuilder.java:100)
    at
org.apache.synapse.Axis2SynapseController.createSynapseConfiguration(Axis2SynapseController.java:479)
    at
org.wso2.carbon.mediation.initializer.CarbonSynapseController.createSynapseConfiguration(CarbonSynapseController.java:169)
    at org.apache.synapse.ServerManager.start(ServerManager.java:177)
    at
org.wso2.carbon.mediation.initializer.ServiceBusInitializer.initESB(ServiceBusInitializer.java:424)
    at
org.wso2.carbon.mediation.initializer.ServiceBusInitializer.activate(ServiceBusInitializer.java:182)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponent.activate(ServiceComponent.java:260)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponentProp.activate(ServiceComponentProp.java:146)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponentProp.build(ServiceComponentProp.java:347)
    at
org.eclipse.equinox.internal.ds.InstanceProcess.buildComponent(InstanceProcess.java:620)
    at
org.eclipse.equinox.internal.ds.InstanceProcess.buildComponents(InstanceProcess.java:197)
    at
org.eclipse.equinox.internal.ds.Resolver.getEligible(Resolver.java:343)
    at
org.eclipse.equinox.internal.ds.SCRManager.serviceChanged(SCRManager.java:222)
    at
org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:107)
    at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.dispatchEvent(BundleContextImpl.java:861)
    at
org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
    at
org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEventPrivileged(ServiceRegistry.java:819)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEvent(ServiceRegistry.java:771)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.register(ServiceRegistrationImpl.java:130)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.registerService(ServiceRegistry.java:214)
    at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService(BundleContextImpl.java:433)
    at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService(BundleContextImpl.java:451)
    at
org.wso2.carbon.event.core.internal.builder.EventBrokerHandler.startEventBroker(EventBrokerHandler.java:58)
    at
org.wso2.carbon.event.core.internal.builder.EventBrokerBuilderDS.activate(EventBrokerBuilderDS.java:72)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponent.activate(ServiceComponent.java:260)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponentProp.activate(ServiceComponentProp.java:146)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponentProp.build(ServiceComponentProp.java:347)
    at
org.eclipse.equinox.internal.ds.InstanceProcess.buildComponent(InstanceProcess.java:620)
    at
org.eclipse.equinox.internal.ds.InstanceProcess.buildComponents(InstanceProcess.java:197)
    at
org.eclipse.equinox.internal.ds.Resolver.getEligible(Resolver.java:343)
    at
org.eclipse.equinox.internal.ds.SCRManager.serviceChanged(SCRManager.java:222)
    at
org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:107)
    at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.dispatchEvent(BundleContextImpl.java:861)
    at
org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
    at
org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEventPrivileged(ServiceRegistry.java:819)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEvent(ServiceRegistry.java:771)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.register(ServiceRegistrationImpl.java:130)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.registerService(ServiceRegistry.java:214)
    at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService(BundleContextImpl.java:433)
    at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService(BundleContextImpl.java:451)
    at
org.wso2.carbon.core.init.CarbonServerManager.initializeCarbon(CarbonServerManager.java:517)
    at
org.wso2.carbon.core.init.CarbonServerManager.start(CarbonServerManager.java:219)
    at
org.wso2.carbon.core.internal.CarbonCoreServiceComponent.activate(CarbonCoreServiceComponent.java:77)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponent.activate(ServiceComponent.java:260)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponentProp.activate(ServiceComponentProp.java:146)
    at
org.eclipse.equinox.internal.ds.model.ServiceComponentProp.build(ServiceComponentProp.java:347)
    at
org.eclipse.equinox.internal.ds.InstanceProcess.buildComponent(InstanceProcess.java:620)
    at
org.eclipse.equinox.internal.ds.InstanceProcess.buildComponents(InstanceProcess.java:197)
    at
org.eclipse.equinox.internal.ds.Resolver.getEligible(Resolver.java:343)
    at
org.eclipse.equinox.internal.ds.SCRManager.serviceChanged(SCRManager.java:222)
    at
org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:107)
    at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.dispatchEvent(BundleContextImpl.java:861)
    at
org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
    at
org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEventPrivileged(ServiceRegistry.java:819)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEvent(ServiceRegistry.java:771)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.register(ServiceRegistrationImpl.java:130)
    at
org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.registerService(ServiceRegistry.java:214)
    at
org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService(BundleContextImpl.java:433)
    at
org.eclipse.equinox.http.servlet.internal.Activator.registerHttpService(Activator.java:81)
    at
org.eclipse.equinox.http.servlet.internal.Activator.addProxyServlet(Activator.java:60)
    at
org.eclipse.equinox.http.servlet.internal.ProxyServlet.init(ProxyServlet.java:40)
    at
org.wso2.carbon.tomcat.ext.servlet.DelegationServlet.init(DelegationServlet.java:38)
    at
org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1267)
    at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1186)
    at
org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1081)
    at
org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5027)
    at
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5314)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    at
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at java.lang.Thread.run(Thread.java:662)






-- 

*Pandula Kariyawasam K.B.*
*Senior Software Engineer - QA*
Mobile: +94772314510

<http://www.wso2.com>
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