Thread.start() without run() invoke

Question

We got interesting problem during migration one old application from java 1.4.2_08 to the java 1.5.0_06. The principal code of application is:
public class objServ extends Thread {
  public void run() {
     while (!End) {
           clientSocket = ServSocket.accept();
           client = new objClient(this, clientSocket);
           logger.sendInfo("client created. "+client.getName());
           client.start();
           logger.sendInfo("client start done. "+client.getName());
  public static void main(String args[]) {
      pkvserv serv = new objServ(hostName, port);
      serv.start();
public class objClient extends Thread {
   // client method run()
  public void run() {
     printlog("Thread run started. "+this..getName());
}The application listen port and generate the client thread for each connection.
After 10 days of using this application and generating and successful processing and termination of near 340000 client threads we got a situation when client thread was created, method start() was invoked, but the client method run() was never invoke.
Does anybody have any idea why this situation can happen? We have memory monitoring on that application and it�s was not a memory problem.

Answer 1

So you're claiming there's a bug in the VM. I doubt it (at least not one of the nature you're claiming). I'd suspect your code didn't execute start(), or that if it did, run() did execute and you're making a faulty conclusion that it didn't.