Multpile inits being called in Servlet

Question

I am trying to create one thread which will be executed once Jakarta-Tomcat begins execution. To do this I have the following code:
web.xml
  <servlet>
    <servlet-name>initializecontroller</servlet-name>
    <servlet-class>roverlook.InitializeController</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>     
InitializeController.java
public class InitializeController extends HttpServlet {
  public void init(ServletConfig config) throws ServletException {
    super.init(config);
    Daemon.INSTANCE.start(); // start daemon thread
Daemon.java
public class Daemon extends Thread{
  public static final Daemon INSTANCE = new Daemon(null); // singleton
  public synchronized void run  () {
     while(true) {
        LoggerCentral.info("Daemon executing required jobs at "+ (new java.util.Date()).toString(), null);
        // do work here
        try {
       Thread.sleep(1000*60);       
        } catch (InterruptedException e) {
            LoggerCentral.exception("Daemon:run():sleep interrupted", null);
    }         When I run Jakarta-Tomcat, I can see the Daemon writing once every ~1 minute as expected. However, when I run other Servlets (which aren't related to this) there are additional instances of the Daemon which are apparently created, because I see many writes to the logfile, sometimes only 1 second apart. It seems like the init() function is being called again even though I t should not be.
To simplify things, I just put a System.out.print() statement in init() and it is in fact called multiple times! Putting a similar statement reveals that destroy() is not being called.
I'm confused, because I thought init() was supposed to run once - Can anyone help out?
Thanks alot

Answer 1

Thank you for the good suggestion - I think I was able to make some progress. The first init() is called in
        at roverlook.InitializeController.init(InitializeController.java:37)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:918)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:243)which looks like normal initialization to me. The second one is:
        at roverlook.InitializeController.init(InitializeController.java:37)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:918)
        ....     org.apache.catalina.connector.warp.WarpConfigurationHandler.deploy(WarpConfigurationHandler.java:313)
        at org.apache.catalina.connector.warp.WarpConfigurationHandler.handle(WarpConfigurationHandler.java:117)
        at org.apache.catalina.connector.warp.WarpConnection.run(WarpConnection.java:189)
        at java.lang.Thread.run(Thread.java:536)which makes me think it has to do with the fact that I am using Apache Tomcat as a front end and using the Warp connector. In my httpd.conf file I have the following:
WebAppDeploy roverlook warpConnection /roverlook/
WebAppDeploy roverlook warpConnection /roverlook/jsp/*.jspIt would appear that this warp connector is causing init() to be called more than once! (could it be in a different JVM?). I need things which are accessed via the connector to share the same space with things in tomcat that load via 'load-on-startup'.
Any additional suggestions? Thanks.