How to use properties from OSGI/Karaf ConfigurationAdminService with Spring dependency injection - spring

Question

I am trying to inject properties stored in Karaf into my Camel/Spring-Service. So far i tried to inject the properties the way documented in Fuse documentation and Spring.
But both seem outdated: the osgix:cm-properties can't be parsed by current Spring version (Fuse 6.3 uses 3.2.16).
On the other hand Apache Aries seem to have something that could be used now. The aries-blueprint-spring feature contains two bundles:
aries.blueprint.spring
aries.blueprint.spring.extender
I found an old user-list post that points to this bundles. But i can't find any documentation or example using this. We only need to inject the properties.

Answer 1

Have been using OSGi Service Compendium for sometime now and below is some extract from one of my projects, hope it helps.
Important is the declaration of compendium namespace and it's prefix osgix
Also note the declaration of persistent-id as the same has to be defined in Karaf configuration file to be created inside etc directory of your container instance.
Now there is Spring property-placeholder referring to osgix properties declaration and propertyPlaceholder inside CamelContext. Both are required if you want to access properties outside - ${propName} and inside - {{propName}} CamelContext.
To access properties outside Camel Context syntax is ${propertyName}
To access properties inside Camel Context syntnax is {{propertyName}}
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:osgix="http://www.springframework.org/schema/osgi-compendium" xmlns:ctx="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd
http://www.springframework.org/schema/osgi http://www.springframework.org/schema/osgi/spring-osgi.xsd
http://www.springframework.org/schema/osgi-compendium http://www.springframework.org/schema/osgi-compendium/spring-osgi-compendium.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!-- A. Configuration Management -->
<osgix:cm-properties id="cachingServicesProp" persistent-id="com.fsafrica.cachingservices.cm">
<prop key="amqBrokerUrl">tcp://localhost:61616</prop>
<prop key="amqUsername">admin</prop>
<prop key="amqPassword">admin</prop>
<prop key="queueName">jms/SRK_CACHE_QUEUE</prop>
</osgix:cm-properties>
<!-- Required for resolving properties for Beans outside CamelContext -->
<ctx:property-placeholder properties-ref="cachingServicesProp" />
<!-- B. ActiveMQ -->
<bean class="org.apache.activemq.camel.component.ActiveMQComponent" id="activemq">
<property name="brokerURL" value="${amqBrokerUrl}" />
<property name="userName" value="${amqUsername}" />
<property name="password" value="${amqPassword}" />
</bean>
<camelContext id="CC-CachingMain" xmlns="http://camel.apache.org/schema/spring">
<!-- Required for resolving properties inside CamelContext -->
<propertyPlaceholder id="properties" location="ref:cachingServicesProp"/>
<!-- JMS INTERFACE -->
<route id="Route-JMSMasterData">
<from uri="activemq:queue:{{queueName}}?transacted=false" />
<log message="#### After putting some data in the Queue (jms/SRK_CACHE_QUEUE) you should be able read this text on Karaf console" />
</route>
</camelContext>
</beans>