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I have written a simple servlet with init() and doGet(), doPost() method. I have a requirement, that I have an API which i need to invoke an server startup.
Is it possible to do so. I tried with init method, and setting default values in web.xml, but i am still unable to do so.
Please tell if I am missing something.
Thanks
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The <load-on-startup> element indicates that the servlet should be loaded on the startup of the web application. The optional contents of this element must be a positive integer that specifies the order in which the servlet should be loaded. Servlets with lower values are loaded before servlets with higher values.
Some ways to preinitialize a servlet are: To use the tag non-zero-integer with the deployment descriptor web. xml which loads and initialises the servlet when the server starts. 3. To load a servlet in order of number specified.
The servlet is initialized by calling the init() method. The servlet calls service() method to process a client's request. The servlet is terminated by calling the destroy() method. Finally, servlet is garbage collected by the garbage collector of the JVM.
As you know well, servlet is loaded at first request. That means it consumes more time at first request. If you specify the load-on-startup in web. xml, servlet will be loaded at project deployment time or server start.
Have you set the load-on-startup attribute to be positive?
<servlet id=”servlet1”>
<load-on-startup>2</load-on-startup>
</servlet>
Alternatively, you might want to use a ServletContextListener to do initialisation work when the container comes up. This is the 'de facto' standard for having a callback to do some initialisation work when the servlet container comes online e.g. we use that to read in some XML files and populate a cache.
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