java - What does activemq broker mean? -


i'm new activemq , jms , started exploring how hello world program works.

i've installed activemq server , run it. now, created desctop application , copy-and-paste apache_activemq_official_hello_world it. when tried run it, got following exception:

caught: javax.jms.jmsexception: not create transport. reason: javax.management.instancealreadyexistsexception: org.apache.activemq:brokername=localhost,type=broker javax.jms.jmsexception: not create transport. reason: javax.management.instancealreadyexistsexception: org.apache.activemq:brokername=localhost,type=broker     @ org.apache.activemq.util.jmsexceptionsupport.create(jmsexceptionsupport.java:35)     @ org.apache.activemq.activemqconnectionfactory.createtransport(activemqconnectionfactory.java:252)     @ org.apache.activemq.activemqconnectionfactory.createactivemqconnection(activemqconnectionfactory.java:265)     @ org.apache.activemq.activemqconnectionfactory.createactivemqconnection(activemqconnectionfactory.java:238)     @ org.apache.activemq.activemqconnectionfactory.createconnection(activemqconnectionfactory.java:184)     @ com.badmitrii.app$helloworldproducer.run(app.java:64)     @ java.lang.thread.run(thread.java:744) caused by: javax.management.instancealreadyexistsexception: org.apache.activemq:brokername=localhost,type=broker     @ com.sun.jmx.mbeanserver.repository.addmbean(repository.java:437)     @ com.sun.jmx.interceptor.defaultmbeanserverinterceptor.registerwithrepository(defaultmbeanserverinterceptor.java:1898)     @ com.sun.jmx.interceptor.defaultmbeanserverinterceptor.registerdynamicmbean(defaultmbeanserverinterceptor.java:966)     @ com.sun.jmx.interceptor.defaultmbeanserverinterceptor.registerobject(defaultmbeanserverinterceptor.java:900)     @ com.sun.jmx.interceptor.defaultmbeanserverinterceptor.registermbean(defaultmbeanserverinterceptor.java:324)     @ com.sun.jmx.mbeanserver.jmxmbeanserver.registermbean(jmxmbeanserver.java:522)     @ org.apache.activemq.broker.jmx.managementcontext.registermbean(managementcontext.java:366)     @ org.apache.activemq.broker.jmx.annotatedmbean.registermbean(annotatedmbean.java:72)     @ org.apache.activemq.broker.brokerservice.startmanagementcontext(brokerservice.java:2370)     @ org.apache.activemq.broker.brokerservice.start(brokerservice.java:567)     @ org.apache.activemq.transport.vm.vmtransportfactory.docompositeconnect(vmtransportfactory.java:124)     @ org.apache.activemq.transport.vm.vmtransportfactory.doconnect(vmtransportfactory.java:54)     @ org.apache.activemq.transport.transportfactory.connect(transportfactory.java:67)     @ org.apache.activemq.activemqconnectionfactory.createtransport(activemqconnectionfactory.java:250)     ... 5 more

and after that

sent message: 386233378 : thread-13 sent message: 535117374 : thread-16 sent message: 1659874841 : thread-17 received: hello world! from: thread-17 : 56191182 received: hello world! from: thread-16 : 1728802812 received: hello world! from: thread-13 : 1191507779 sent message: 1424811745 : thread-22 sent message: 1340394669 : thread-25 sent message: 1585379622 : thread-29 sent message: 607795742 : thread-27 sent message: 807925334 : thread-32 received: hello world! from: thread-22 : 1629703769 received: hello world! from: thread-29 : 2145661378 received: hello world! from: thread-25 : 1459121566 received: hello world! from: thread-27 : 1628632972 received: hello world! from: thread-32 : 538611977 received: null

my question need in activemq server in example , activemq broker mentioned in exception?


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