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Some environments want to use the pointcut parser but not the weaver. For example, Spring uses the pointcut parser but then may choose to implement weaving via dynamic proxies. In this situation the aspectjweaver.jar is overkill as the weaver is not being used - and indeed the weaver being in the jar can sometimes cause problems. (Not technical problems, more likely problems related to application system rollout being delayed because approval is needed for a weaver to be deployed rather than just a simple parser).
org.aspectj.matcher.jar is now the minimal parser/matcher.