you web-context root might change. That means the ones that were referring to URLs within current context will have to refer to new URL with different context.
Also, it can pose problems in terms of login and session management (if you are not using SSO). This decision should be effected provided web application and components are quite independent of each other. So some web pages that work together can be put into another war file but can still share common code base (java sources etc).
-- SCJP 5, OCPJBCD 5, OCPJWSD 5 (in progress)
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