Not sure if you are asking how to weave in general or just in Karaf 4 but if you are interested in the current state of play of weaving and OSGi have a read of https://mail.osgi.org/pipermail/osgi-dev/2016-February/thread.html (subject: Monitor method calls for a bundle?) Chetan Mehrotra's response references a URL that might be useful. We are on Karaf 2.3.1/Felix/SpringDM and use weaving hooks + Javassist primarily for aiding in database auditing, so definitely possible in Karaf 2.3.
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