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about servlet variable
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class HolisticCounter extends HttpServlet {

static int classCount = 0; // shared by all instances
int count = 0; // separate for each servlet
static Hashtable instances = new Hashtable(); // also shared

public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
PrintWriter out = res.getWriter();

out.println("Since loading, this servlet instance has been accessed " +
count + " times.");

// Keep track of the instance count by putting a reference to this
// instance in a hashtable. Duplicate entries are ignored.
// The size() method returns the number of unique instances stored.
instances.put(this, this);
out.println("There are currently " +
instances.size() + " instances.");

out.println("Across all instances, this servlet class has been " +
"accessed " + classCount + " times.");

can anyonn expalin the result
Please read this.
At first glance I would say you got bit by one of the invoker servlet traps. Read the Invoker servlet FAQ here at the ranch

This thread has been viewed 465 times.

All times above are in ranch (not your local) time.
The current ranch time is
Sep 23, 2018 09:52:18.