Thanks for the information. I have ordered the way the applications start 

First application - starts the broker ,  creates connection to the same
broker and starts listening to some queues 
Second application - creates connection to the same broker and starts
listening to different queues 

Broker URL is vm://localhost.


When i do this, I get the following Exception in the second application. Can
you please let me know how to resolve this ?

2013-02-14 10:51:36,932 [taskExecutor-5] ERROR o.a.a.b.BrokerService: Failed
to start ActiveMQ JMS Message Broker (localhost, null). Reason:
javax.management.InstanceAlreadyExistsException:
org.apache.activemq:BrokerName=localhost,Type=Broker
javax.management.InstanceAlreadyExistsException:
org.apache.activemq:BrokerName=localhost,Type=Broker
        at com.sun.jmx.mbeanserver.Repository.addMBean(Unknown Source)
~[na:1.6.0_17]
        at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.internal_addObject(Unknown
Source) ~[na:1.6.0_17]
        at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(Unknown
Source) ~[na:1.6.0_17]
        at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(Unknown
Source) ~[na:1.6.0_17]
        at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(Unknown
Source) ~[na:1.6.0_17]
        at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(Unknown
Source) ~[na:1.6.0_17]
        at
org.apache.activemq.broker.jmx.ManagementContext.registerMBean(ManagementContext.java:308)
~[activemq-core-5.6.0.jar:5.6.0]
        at
org.apache.activemq.broker.jmx.AnnotatedMBean.registerMBean(AnnotatedMBean.java:65)
~[activemq-core-5.6.0.jar:5.6.0]
        at
org.apache.activemq.broker.BrokerService.startManagementContext(BrokerService.java:2228)
~[activemq-core-5.6.0.jar:5.6.0]
        at
org.apache.activemq.broker.BrokerService.start(BrokerService.java:516)
~[activemq-core-5.6.0.jar:5.6.0]
        at
org.apache.activemq.transport.vm.VMTransportFactory.doCompositeConnect(VMTransportFactory.java:124)
[activemq-core-5.6.0.jar:5.6.0]
        at
org.apache.activemq.transport.vm.VMTransportFactory.doConnect(VMTransportFactory.java:54)
[activemq-core-5.6.0.jar:5.6.0]
        at
org.apache.activemq.transport.TransportFactory.doConnect(TransportFactory.java:51)
[activemq-core-5.6.0.jar:5.6.0]
        at
org.apache.activemq.transport.TransportFactory.connect(TransportFactory.java:80)
[activemq-core-5.6.0.jar:5.6.0]
        at
org.apache.activemq.ActiveMQConnectionFactory.createTransport(ActiveMQConnectionFactory.java:252)
[activemq-core-5.6.0.jar:5.6.0]
        at
org.apache.activemq.ActiveMQConnectionFactory.createActiveMQConnection(ActiveMQConnectionFactory.java:267)
[activemq-core-5.6.0.jar:5.6.0]
        at
org.apache.activemq.ActiveMQConnectionFactory.createActiveMQConnection(ActiveMQConnectionFactory.java:239)
[activemq-core-5.6.0.jar:5.6.0]
        at
org.apache.activemq.ActiveMQConnectionFactory.createConnection(ActiveMQConnectionFactory.java:185)
[activemq-core-5.6.0.jar:5.6.0]
        at
org.apache.activemq.pool.PooledConnectionFactory.createConnection(PooledConnectionFactory.java:139)
[activemq-pool-5.6.0.jar:5.6.0]
        at
org.apache.activemq.pool.PooledConnectionFactory.createConnection(PooledConnectionFactory.java:123)
[activemq-pool-5.6.0.jar:5.6.0]
        at
org.apache.activemq.pool.PooledConnectionFactory.createConnection(PooledConnectionFactory.java:94)
[activemq-pool-5.6.0.jar:5.6.0]
        at
org.springframework.jms.support.JmsAccessor.createConnection(JmsAccessor.java:184)
[spring-jms-2.5.6.jar:2.5.6]
        at
org.springframework.jms.listener.AbstractJmsListeningContainer.createSharedConnection(AbstractJmsListeningContainer.java:378)
[spring-jms-2.5.6.jar:2.5.6]
        at
org.springframework.jms.listener.AbstractJmsListeningContainer.refreshSharedConnection(AbstractJmsListeningContainer.java:363)
[spring-jms-2.5.6.jar:2.5.6]
        at
org.springframework.jms.listener.DefaultMessageListenerContainer.refreshConnectionUntilSuccessful(DefaultMessageListenerContainer.java:785)
[spring-jms-2.5.6.jar:2.5.6]
        at
org.springframework.jms.listener.DefaultMessageListenerContainer.recoverAfterListenerSetupFailure(DefaultMessageListenerContainer.java:767)
[spring-jms-2.5.6.jar:2.5.6]
        at
org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.run(DefaultMessageListenerContainer.java:898)
[spring-jms-2.5.6.jar:2.5.6]




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