java.lang.ClassNotFoundException: weblogic.jndi.WLInitialContextFactory when running bundle in 6.2.1

Issue

I need to define a JMS Connection Factory in Blueprint for connecting to WebLogic.
This requires the following Blueprint configuration:

  <bean id="jmsIn" class="org.apache.camel.component.jms.JmsComponent">
    <property name="connectionFactory" ref="jmsInConnectionFactory" />
  </bean>

  <!-- JNDI lookup for remote connection factory -->
  <!-- Defines the Client connection to the JNDI Server -->
  <bean id="jndiTemplate" class="org.springframework.jndi.JndiTemplate">
    <property name="environment">
      <props>
        <prop key="java.naming.factory.initial">weblogic.jndi.WLInitialContextFactory</prop>
        <prop key="java.naming.provider.url" value="t3://localhost:7001" />
        <prop key="java.naming.security.principal" value="XXX" />
       <prop key="java.naming.security.credentials" value="XXX" />
      </props>
    </property>
  </bean>

  <!-- Gets a Weblogic JMS Connection factory object from JDNI Server by jndiName -->
  <bean id="jmsInConnectionFactoryJndiLookupFactory" class="org.springframework.jndi.JndiObjectFactoryBean" init-method="afterPropertiesSet">
    <property name="jndiTemplate" ref="jndiTemplate" />
    <property name="jndiName" value="dummyConnectionFactory" />
    <property name="proxyInterface" value="javax.jms.ConnectionFactory" />  
  </bean>

<bean id="jmsInConnectionFactory" factory-ref="jmsInConnectionFactoryJndiLookupFactory" factory-method="getObject" />

However this configuration fails at runtime with

Caused by: javax.naming.NoInitialContextException: Cannot instantiate class: weblogic.jndi.WLInitialContextFactory [Root exception is java.lang.ClassNotFoundException: weblogic.jndi.WLInitialContextFactory]
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:657)[:1.6.0_65]
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288)[:1.6.0_65]
at javax.naming.InitialContext.init(InitialContext.java:223)[:1.6.0_65]
at javax.naming.InitialContext.<init>(InitialContext.java:197)[:1.6.0_65]
at org.springframework.jndi.JndiTemplate.createInitialContext(JndiTemplate.java:136)[121:org.apache.servicemix.bundles.spring-context:3.2.8.RELEASE_1]
at org.springframework.jndi.JndiTemplate.getContext(JndiTemplate.java:103)[121:org.apache.servicemix.bundles.spring-context:3.2.8.RELEASE_1]
at org.springframework.jndi.JndiTemplate.execute(JndiTemplate.java:85)[121:org.apache.servicemix.bundles.spring-context:3.2.8.RELEASE_1]
at org.springframework.jndi.JndiTemplate.lookup(JndiTemplate.java:152)[121:org.apache.servicemix.bundles.spring-context:3.2.8.RELEASE_1]
at org.springframework.jndi.JndiTemplate.lookup(JndiTemplate.java:178)[121:org.apache.servicemix.bundles.spring-context:3.2.8.RELEASE_1]
at org.springframework.jndi.JndiLocatorSupport.lookup(JndiLocatorSupport.java:95)
...
Caused by: java.lang.ClassNotFoundException: weblogic.jndi.WLInitialContextFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)[:1.6.0_65]
at java.security.AccessController.doPrivileged(Native Method)[:1.6.0_65]
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)[:1.6.0_65]
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)[:1.6.0_65]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)[:1.6.0_65]
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)[:1.6.0_65]
at java.lang.Class.forName0(Native Method)[:1.6.0_65]
at java.lang.Class.forName(Class.java:249)[:1.6.0_65]
at com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:46)[:1.6.0_65]
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:654)[:1.6.0_65]
... 69 more