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Date: Mon, 28 Jun 2010 09:27:40 +0200
From: =?ISO-8859-1?Q?Jean-Baptiste_Onofr=E9?= <jb@nanthrax.net>
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To: dev@activemq.apache.org
CC: dev@servicemix.apache.org
Subject: OSGi dependency in ActiveMQ 5.3.2
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Hi all,

as you know, ActiveMQ is used in ServiceMix as default message broker.

ServiceMix 3.3.x uses Spring configuration and loads the ActiveMQ bean 
in activemq.xml Spring file:

<beans xmlns:amq="http://activemq.apache.org/schema/core">
   <!-- ActiveMQ JMS Broker configuration -->
   <amq:broker id="broker" depends-on="jmxServer" useShutdownHook="false">

     <!-- Disable creation of the jmx connector
          which is created in the jmx.xml configuration file -->
     <amq:managementContext>
       <bean class="org.apache.activemq.broker.jmx.ManagementContext">
         <property name="createConnector" value="false" />
       </bean>
     </amq:managementContext>

     <!-- Use AMQ Message Store as default broker persistence adapter -->
     <amq:persistenceAdapter>
       <amq:amqPersistenceAdapter directory="file:./data/amq"/>

       <!-- Examples for journaledJDBC if JDBC is required -->
       <!--
       <amq:journaledJDBC journalLogFiles="5" dataDirectory="./data/amq"/>
       <amq:journaledJDBC journalLogFiles="5" dataDirectory="../data" 
dataSource="#postgres-ds"/>
       -->
     </amq:persistenceAdapter>

     <amq:transportConnectors>
        <!-- Activate a TCP connector with multicast discovery.
             Note that multicast may be disabled if your computer
             is not on a network, which may prevent the broker to start.
             In such a case, just remove the discoveryUri attribute.
          -->
        <amq:transportConnector uri="tcp://localhost:61616" 
discoveryUri="multicast://default"/>
     </amq:transportConnectors>

     <amq:networkConnectors>
       <!-- by default just auto discover the other brokers -->
       <amq:networkConnector uri="multicast://default"/>
       <!--
       <amq:networkConnector 
uri="static://(tcp://host1:61616,tcp://host2:61616)"/>
       -->
     </amq:networkConnectors>

   </amq:broker>

</beans>

Up to ActiveMQ 5.3.1, we didn't encounter any issue with that.

But now, I updated ServiceMix 3.3.x to use ActiveMQ 5.3.2 and I got the 
following at startup:

Caught: org.springframework.beans.factory.BeanCreationException: Error 
creating bean with name 'broker' defined in class path resource 
[activemq.xml]: Instantiation of bean failed; nested exception is 
org.springframework.beans.BeanInstantiationException: Could not 
instantiate bean class [org.apache.activemq.xbean.XBeanBrokerService]: 
Constructor threw exception; nested exception is 
java.lang.NoClassDefFoundError: org/osgi/framework/BundleException

It looks like ActiveMQ 5.3.2 bean now have a dependency to OSGi framework.

As ServiceMix 3.3.x doesn't use OSGi at all (pure Spring), I'm not very 
pleased to add OSGi framework in the distribution classpath.

Moreover, for ActiveMQ, I think that this dependency is not very 
flexible for users that use ActiveMQ "outside" OSGi.

Is it possible to define this dependency as an optional one ?
What do you think ?

FYI, I raise the following Jira task about this:
https://issues.apache.org/activemq/browse/SM-1958

Thanks
Regards
JB