JSP pages are automatically re-compiled if the uncompiled JSP page is newer than the compiled version of the page.

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JSP pages are compiled into Java servlets, which are then executed by the server to generate HTML responses. When a JSP page is accessed for the first time, it is automatically compiled into a Java servlet. Subsequent requests for the same page will use the compiled servlet instead of re-compiling the JSP page, unless the source JSP file has been modified since the last time it was compiled. In that case, the JSP page will be re-compiled to update the corresponding servlet.

JSP Pages Are Automatically Re-Compiled If the Uncompiled JSP Page