What is Servlet/ JSP Caching ?

You can improve performance of your web application by caching the output of either servlet or JSP (Since JSP gets compiled into servlet). The way it works is after a servlet is invoked and completes generating the output to cache, a cache entry is created containing the output and the side effects of the servlet. These side effects can include calls to other servlets or JavaServer Pages (JSP) files or metadata about the entry, including timeout and entry priority information. Configure servlet caching to save the output of servlets and JavaServer Pages (JSP) files to the dynamic cache

Unique entries are distinguished by an ID string that is generated from the HttpServletRequest object each time the servlet runs. You can then base servlet caching on:

  • Request parameters and attributes of the Universal Resource Identifier (URI) that was used to invoke the servlet

  • Session information

  • Other options, including cookies

Because JavaServer Pages files are compiled into servlets, the dynamic cache function treats JavaServer Pages files the same as servlets, except in specifically documented situations.

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