Servlet background process on tomcat 4.0.2

Question

i have 1 servlet which will run a thread, background process, whenever the init() on that servlet called. i tried on tomcat 3.3a and tomcat 3.2.3, and both tomcat will run my servlet's background process, will run the thread. but, when i run the servlet using tomcat 4, tomcat 4 will run the init(), but when it do not start the thread. what happen?... i used the same code, servlet, on tomcat 3.2.3, 3.3a and 4....
can anyone explain it to me?.....

Answer 1

my code look like this:
public class Discover extends HttpServlet implements Runnable
Thread t = null;
boolean running = false;
public void init()
t = new Thread(this);
t.start();
System.out.println("thread start");
public void doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("discover=" + running);
public void run()
running = true;
System.out.println("thread running...");
* do some stuff here....
running = false;
System.out.println("thread stopped...");
i tried this servlet on tomcat 3.2.3 and 3.3a and the thread run. i can see the 'thread start', 'thread running' and 'thread stopped' on the tomcat console. but, when i use tomcat 4, i can only see 'thread start' on the console, which show that the run() is not execute...... y?... please help me.......