ACS-1253 Enable Camel JMX management (#295)

- enable Camel JMX management
- disable JMS connection idle timeout
- update ActiveMQ broker URLs to use NIO

repository/src/main/resources/alfresco/subsystems/Messaging/default/messaging-context.xml

@@ -22,6 +22,7 @@
     <bean id="pooledConnectionFactory" class="org.apache.activemq.pool.PooledConnectionFactory"
         init-method="start" destroy-method="stop">
         <property name="maxConnections" value="${messaging.broker.connections.max}" />
+        <property name="createConnectionOnStartup" value="false"/>
         <property name="connectionFactory" ref="activeMqConnectionFactory" />
     </bean>
     
@@ -85,7 +86,7 @@
 
     <camelContext id="alfrescoCamelContext" xmlns="http://camel.apache.org/schema/spring" useBreadcrumb="true">
         <contextScan/>
-        <camel:jmxAgent id="agent" mbeanObjectDomainName="Alfresco.Camel" />
+        <jmxAgent id="agent" mbeanObjectDomainName="Alfresco.Camel" />
         <template id="camelProducerTemplate" defaultEndpoint="direct:alfresco.default" />
     </camelContext>
 

repository/src/main/resources/alfresco/subsystems/Messaging/default/messaging.properties

@@ -1,5 +1,5 @@
-# External failover broker at tcp://localhost
-messaging.broker.url=failover:(tcp://localhost:61616)?timeout=3000&jms.useCompression=true
+# External failover broker at nio://localhost ("nio" = "tcp" through the java.nio API)
+messaging.broker.url=failover:(nio://localhost:61616)?timeout=3000&jms.useCompression=true
 messaging.broker.ssl=false
 messaging.broker.username=
 messaging.broker.password=