karaf/deployer/blueprint/src/main/resources/META-INF/spring/blueprint-deployer.xml

<?xml version="1.0" encoding="UTF-8"?>
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    Licensed to the Apache Software Foundation (ASF) under one or more
    contributor license agreements.  See the NOTICE file distributed with
    this work for additional information regarding copyright ownership.
    The ASF licenses this file to You under the Apache License, Version 2.0
    (the "License"); you may not use this file except in compliance with
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       http://www.apache.org/licenses/LICENSE-2.0

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<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:osgi="http://www.springframework.org/schema/osgi"
       xmlns:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation="
  http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd
  http://www.springframework.org/schema/util
  http://www.springframework.org/schema/util/spring-util.xsd
  http://www.springframework.org/schema/osgi
  http://www.springframework.org/schema/osgi/spring-osgi.xsd">

    <bean id="blueprintDeploymentListener" class="org.apache.felix.karaf.deployer.blueprint.BlueprintDeploymentListener">

    </bean>

    <osgi:service ref="blueprintDeploymentListener">
        <osgi:interfaces>
            <value>org.apache.felix.karaf.deployer.filemonitor.DeploymentListener</value>
        </osgi:interfaces>
    </osgi:service>

    <bean id="blueprintHandler" class="org.apache.felix.karaf.deployer.blueprint.BlueprintURLHandler" />

    <osgi:service ref="blueprintHandler" interface="org.osgi.service.url.URLStreamHandlerService">
    	<osgi:service-properties>
            <entry key="url.handler.protocol" value="blueprint"/>
        </osgi:service-properties>
    </osgi:service>

</beans>