Activemq cluster on Amazon EC2

Hello, I'm trying to deploy activeMQ cluster over amazon vpc in order to create later on a jwebsocket cluster. I know that multicast is not supported over EC2 instances so I followed the following tuto in order to do a discovery with http http://stackoverflow.com/questions/19512297/active-mq-c

Re: activemq cluster Error creating bean with name 'org.apache.activemq.xbean.XBeanBrokerService#0'

729331/how-to-resolve-classnotfoundexception-com-mongodb-connection-bufferprovider > > Hopefully that link helps; if not you can do your own search. Either way, > your problem is related to MongoDB, not ActiveMQ, so if you have further > questions, ask them, not us. > On May 25, 2016 3:

activemq cluster Error creating bean with name 'org.apache.activemq.xbean.XBeanBrokerService#0'

I'm trying to deploy a jwebsocket cluster which uses activemq cluster. I've configured my activemq.xml as in the attached file. I've added the needed plugins : jWebSocketActiveMQPlugIn-1.0.jar,jWebSocketJMSPlugIn-1.0.jar, mongodb-driver-3.2.2.jar to my lib folder in the activemq installation folder