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Is there any method to unload a servlet from Web Server memory without restarting the server?

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Is there any method to unload a servlet from Web Server memory without restarting the server?
posted Oct 19, 2015 by Shyam

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1 Answer

+2 votes

There is no standard method/mechanism to unload a servlet from memory. Some servers, like JWS, provide the means to load and unload servlets from their administration module. Others, like Tomcat, require you to just replace the WAR file.

answer Oct 20, 2015 by Karthick.c
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+2 votes
public class ServletClassName extends HttpServlet {
//declare instance variables for the servlet
int  instanceVar ; // not thread−safe
// overriding the Generic Servlet.init ( )
@Override
public void init ( ) throws ServletException {
// initialize instance variables, etc.
instanceVar = 0 ;
}
. . .
}

Per each page request, in the service() method (which eventually will be either doGet(), doPost(), or whatever),
you can manipulate instance variables.

Write a Servlet that counts the total number of visits (how many times it's being visited from all clients). The Servlet should display the following information

• Total Page Visits:
• Client Remote Address:
• Client Host Address: <client_fully_qualied_url__or__client_IP_address>

The last two can be obtained from the HttpServletRequest, Refer to the Java EE API

then how can re-do these using the Java API for HttpSession.

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