Download the standalone fuse services framework distribution and take a look at the /samples/configuration_interceptor.
You can apply the same approach when using a cxf-bc, by using the busCfg attribute in your cxf-bc's xbean.xml
Hope that helps
Actually for servicemix-cxf-bc and servicemix-cxf-se endpoint, we can configure interceptor directly on the endpoint, no necessary to use busCfg.
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