4.6. Sharing Data Among Web Applications
One of the major purposes of Web applications is to keep data separate. Each Web application maintains its own table of sessions and its own servlet context. Each Web application also uses its own class loader; this behavior eliminates problems with name conflicts but means that static methods and fields can’t be used to share data among applications. However, it is still possible to share data with cookies or by using ServletContext objects that are associated with specific URLs. These two approaches are summarized below.
Cookies. Cookies are maintained by the browser, not by the server. Consequently, cookies can be shared across multiple Web applications as long as they are set to apply to any path ...
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