서블릿 load-on-startup

<servlet>
     <servlet-name>.........</servlet-name>
     <servlet-class>..................</servlet-class>
     <init-param>
       <param-name>............</param-name>
       <param-value>............</param-value>
     </init-param>
     <!-- Load this servlet at server startup time -->
     <load-on-startup>0</load-on-startup>
 </servlet>

톰캣 서버가 시작하는 시점은 아니고,
컨텍스트의 웹 애플리케이션이 톰캣 서버에 의해 인식되는 시점입니다.

load-on-startup 엘리먼트에 적어준 숫자가

  음의 정수인 경우:
      그 서블릿에 접근될 때 (즉, load-on-startup 엘리먼트가 없는 경우와 동일함)

  0 이거나 양의 정수인 경우:
      그 서블릿이 배치(deploy)될 때 (즉, 컨텍스트가 인식될 때)
         숫자가 작은 것 부터 먼저 로딩된다.



아래는 "Java™ Servlet Specification Version 2.3" 에서 뽑아온 원문입니다.

<!--
The load-on-startup element indicates that this servlet should be
loaded (instantiated and have its init() called) on the startup
of the web application. The optional contents of
these element must be an integer indicating the order in which
the servlet should be loaded. If the value is a negative integer,
or the element is not present, the container is free to load the
servlet whenever it chooses. If the value is a positive integer
or 0, the container must load and initialize the servlet as the
application is deployed. The container must guarantee that
servlets marked with lower integers are loaded before servlets
marked with higher integers. The container may choose the order
of loading of servlets with the same load-on-start-up value.

Used in: servlet
-->

<!ELEMENT load-on-startup (#PCDATA)> 

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